Consolidated statement of changes in equity
millions of €  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
        
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
  | 
            Issued capital and reserves attributable to owners of the parent  | 
            
  | 
            Issued capital and reserves attributable to owners of the parent  | 
            Total  | 
            Non-controlling interests  | 
            Total   | 
            
  | 
        |||||||||||
  | 
            Equity contributed  | 
            Consolidated shareholders’ equity generated  | 
            Total other comprehensive income  | 
            
  | 
            
  | 
            
  | 
            
  | 
        |||||||||||
  | 
            Issued capital  | 
            Treasury shares  | 
            Capital reserves  | 
            Retained earnings including carryforwards  | 
            Net profit (loss)  | 
            Translation of foreign operations  | 
            Revaluation surplus  | 
            
  | 
            Equity instruments measured at fair value through other comprehensive income (IFRS 9)  | 
            Debt instruments measured at fair value through other comprehensive income (IFRS 9)  | 
            Hedging instruments: designated risk components (IFRS 9)  | 
            Hedging instruments: hedging costs (IFRS 9)  | 
            Investments accounted for using the equity method  | 
            Taxes  | 
            
  | 
            
  | 
            
  | 
            
  | 
        
Balance at January 1, 2021  | 
            12,189  | 
            (46)  | 
            62,640  | 
            (38,905)  | 
            4,158  | 
            (4,092)  | 
            (14)  | 
            
  | 
            156  | 
            0  | 
            (223)  | 
            24  | 
            0  | 
            34  | 
            35,922  | 
            36,628  | 
            72,550  | 
            
  | 
        
Transfer resulting from changes in accounting standards  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Changes in the composition of the Group  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            (181)  | 
            (181)  | 
            
  | 
        
Transactions with owners  | 
            
  | 
            
  | 
            (152)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            5  | 
            
  | 
            
  | 
            (1)  | 
            (149)  | 
            3  | 
            (145)  | 
            
  | 
        
Unappropriated profit (loss) carried forward  | 
            
  | 
            
  | 
            
  | 
            4,158  | 
            (4,158)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Dividends  | 
            
  | 
            
  | 
            
  | 
            (2,846)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (2,846)  | 
            (234)  | 
            (3,080)  | 
            
  | 
        
Capital increase at Deutsche Telekom AG  | 
            576  | 
            
  | 
            1,063  | 
            
  | 
            
  | 
            (83)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (64)  | 
            
  | 
            
  | 
            19  | 
            1,511  | 
            (2,358)  | 
            (847)  | 
            
  | 
        
Capital increase from share-based payment  | 
            
  | 
            
  | 
            154  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            154  | 
            188  | 
            342  | 
            
  | 
        
Share buy-back/  | 
            
  | 
            1  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            1  | 
            0  | 
            1  | 
            
  | 
        
Profit (loss)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            3,705  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            3,705  | 
            1,578  | 
            5,283  | 
            
  | 
        
Other comprehensive income  | 
            
  | 
            
  | 
            
  | 
            821  | 
            
  | 
            1,720  | 
            
  | 
            
  | 
            127  | 
            0  | 
            122  | 
            57  | 
            
  | 
            (53)  | 
            2,794  | 
            2,142  | 
            4,937  | 
            
  | 
        
Total comprehensive income  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            6,498  | 
            3,722  | 
            10,220  | 
            
  | 
        
Transfer to retained earnings  | 
            
  | 
            
  | 
            
  | 
            52  | 
            
  | 
            
  | 
            5  | 
            
  | 
            (60)  | 
            0  | 
            
  | 
            
  | 
            
  | 
            3  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Balance at September 30, 2021  | 
            12,765  | 
            (45)  | 
            63,705  | 
            (36,720)  | 
            3,705  | 
            (2,454)  | 
            (9)  | 
            
  | 
            223  | 
            0  | 
            (160)  | 
            81  | 
            0  | 
            1  | 
            41,092  | 
            37,769  | 
            78,861  | 
            
  | 
        
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
        
Balance at January 1, 2022  | 
            12,765  | 
            (37)  | 
            63,773  | 
            (36,358)  | 
            4,176  | 
            (1,747)  | 
            (7)  | 
            
  | 
            143  | 
            (37)  | 
            (56)  | 
            86  | 
            0  | 
            (22)  | 
            42,679  | 
            38,790  | 
            81,469  | 
            
  | 
        
Transfer resulting from changes in accounting standards  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Changes in the composition of the Group  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            (583)  | 
            (583)  | 
            
  | 
        
Transactions with owners  | 
            
  | 
            
  | 
            (1,871)  | 
            
  | 
            
  | 
            17  | 
            (12)  | 
            
  | 
            
  | 
            (2)  | 
            (27)  | 
            
  | 
            
  | 
            8  | 
            (1,887)  | 
            (1,734)  | 
            (3,621)  | 
            
  | 
        
Unappropriated profit (loss) carried forward  | 
            
  | 
            
  | 
            
  | 
            4,176  | 
            (4,176)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Dividends  | 
            
  | 
            
  | 
            
  | 
            (3,182)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (3,182)  | 
            (197)  | 
            (3,379)  | 
            
  | 
        
Capital increase at Deutsche Telekom AG  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Capital increase from share-based payment  | 
            
  | 
            
  | 
            259  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            259  | 
            273  | 
            531  | 
            
  | 
        
Share buy-back/  | 
            
  | 
            2  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            2  | 
            0  | 
            2  | 
            
  | 
        
Profit (loss)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            6,987  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            6,987  | 
            706  | 
            7,692  | 
            
  | 
        
Other comprehensive income  | 
            
  | 
            
  | 
            
  | 
            938  | 
            
  | 
            5,125  | 
            
  | 
            
  | 
            64  | 
            (38)  | 
            726  | 
            (45)  | 
            
  | 
            (191)  | 
            6,578  | 
            5,786  | 
            12,365  | 
            
  | 
        
Total comprehensive income  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            13,565  | 
            6,492  | 
            20,057  | 
            
  | 
        
Transfer to retained earnings  | 
            
  | 
            
  | 
            
  | 
            (14)  | 
            
  | 
            
  | 
            5  | 
            
  | 
            12  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (2)  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Balance at September 30, 2022  | 
            12,765  | 
            (36)  | 
            62,161  | 
            (34,441)  | 
            6,987  | 
            3,395  | 
            (15)  | 
            
  | 
            218  | 
            (77)  | 
            643  | 
            40  | 
            0  | 
            (207)  | 
            51,435  | 
            43,040  | 
            94,475  | 
            
  | 
        
millions of €  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
        
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
  | 
            Issued capital and reserves attributable to owners of the parent  | 
            
  | 
            Issued capital and reserves attributable to owners of the parent  | 
            Total  | 
            Non-controlling interests  | 
            Total   | 
            
  | 
        |||||||||||
  | 
            Equity contributed  | 
            Consolidated shareholders’ equity generated  | 
            Total other comprehensive income  | 
            
  | 
            
  | 
            
  | 
            
  | 
        |||||||||||
  | 
            Issued capital  | 
            Treasury shares  | 
            Capital reserves  | 
            Retained earnings including carryforwards  | 
            Net profit (loss)  | 
            Translation of foreign operations  | 
            Revaluation surplus  | 
            
  | 
            Equity instruments measured at fair value through other comprehensive income (IFRS 9)  | 
            Debt instruments measured at fair value through other comprehensive income (IFRS 9)  | 
            Hedging instruments: designated risk components (IFRS 9)  | 
            Hedging instruments: hedging costs (IFRS 9)  | 
            Investments accounted for using the equity method  | 
            Taxes  | 
            
  | 
            
  | 
            
  | 
            
  | 
        
Balance at January 1, 2021  | 
            12,189  | 
            (46)  | 
            62,640  | 
            (38,905)  | 
            4,158  | 
            (4,092)  | 
            (14)  | 
            
  | 
            156  | 
            0  | 
            (223)  | 
            24  | 
            0  | 
            34  | 
            35,922  | 
            36,628  | 
            72,550  | 
            
  | 
        
Transfer resulting from changes in accounting standards  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Changes in the composition of the Group  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            (181)  | 
            (181)  | 
            
  | 
        
Transactions with owners  | 
            
  | 
            
  | 
            (152)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            5  | 
            
  | 
            
  | 
            (1)  | 
            (149)  | 
            3  | 
            (145)  | 
            
  | 
        
Unappropriated profit (loss) carried forward  | 
            
  | 
            
  | 
            
  | 
            4,158  | 
            (4,158)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Dividends  | 
            
  | 
            
  | 
            
  | 
            (2,846)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (2,846)  | 
            (234)  | 
            (3,080)  | 
            
  | 
        
Capital increase at Deutsche Telekom AG  | 
            576  | 
            
  | 
            1,063  | 
            
  | 
            
  | 
            (83)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (64)  | 
            
  | 
            
  | 
            19  | 
            1,511  | 
            (2,358)  | 
            (847)  | 
            
  | 
        
Capital increase from share-based payment  | 
            
  | 
            
  | 
            154  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            154  | 
            188  | 
            342  | 
            
  | 
        
Share buy-back/  | 
            
  | 
            1  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            1  | 
            0  | 
            1  | 
            
  | 
        
Profit (loss)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            3,705  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            3,705  | 
            1,578  | 
            5,283  | 
            
  | 
        
Other comprehensive income  | 
            
  | 
            
  | 
            
  | 
            821  | 
            
  | 
            1,720  | 
            
  | 
            
  | 
            127  | 
            0  | 
            122  | 
            57  | 
            
  | 
            (53)  | 
            2,794  | 
            2,142  | 
            4,937  | 
            
  | 
        
Total comprehensive income  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            6,498  | 
            3,722  | 
            10,220  | 
            
  | 
        
Transfer to retained earnings  | 
            
  | 
            
  | 
            
  | 
            52  | 
            
  | 
            
  | 
            5  | 
            
  | 
            (60)  | 
            0  | 
            
  | 
            
  | 
            
  | 
            3  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Balance at September 30, 2021  | 
            12,765  | 
            (45)  | 
            63,705  | 
            (36,720)  | 
            3,705  | 
            (2,454)  | 
            (9)  | 
            
  | 
            223  | 
            0  | 
            (160)  | 
            81  | 
            0  | 
            1  | 
            41,092  | 
            37,769  | 
            78,861  | 
            
  | 
        
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
        
Balance at January 1, 2022  | 
            12,765  | 
            (37)  | 
            63,773  | 
            (36,358)  | 
            4,176  | 
            (1,747)  | 
            (7)  | 
            
  | 
            143  | 
            (37)  | 
            (56)  | 
            86  | 
            0  | 
            (22)  | 
            42,679  | 
            38,790  | 
            81,469  | 
            
  | 
        
Transfer resulting from changes in accounting standards  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Changes in the composition of the Group  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            (583)  | 
            (583)  | 
            
  | 
        
Transactions with owners  | 
            
  | 
            
  | 
            (1,871)  | 
            
  | 
            
  | 
            17  | 
            (12)  | 
            
  | 
            
  | 
            (2)  | 
            (27)  | 
            
  | 
            
  | 
            8  | 
            (1,887)  | 
            (1,734)  | 
            (3,621)  | 
            
  | 
        
Unappropriated profit (loss) carried forward  | 
            
  | 
            
  | 
            
  | 
            4,176  | 
            (4,176)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Dividends  | 
            
  | 
            
  | 
            
  | 
            (3,182)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (3,182)  | 
            (197)  | 
            (3,379)  | 
            
  | 
        
Capital increase at Deutsche Telekom AG  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Capital increase from share-based payment  | 
            
  | 
            
  | 
            259  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            259  | 
            273  | 
            531  | 
            
  | 
        
Share buy-back/  | 
            
  | 
            2  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            2  | 
            0  | 
            2  | 
            
  | 
        
Profit (loss)  | 
            
  | 
            
  | 
            
  | 
            
  | 
            6,987  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            6,987  | 
            706  | 
            7,692  | 
            
  | 
        
Other comprehensive income  | 
            
  | 
            
  | 
            
  | 
            938  | 
            
  | 
            5,125  | 
            
  | 
            
  | 
            64  | 
            (38)  | 
            726  | 
            (45)  | 
            
  | 
            (191)  | 
            6,578  | 
            5,786  | 
            12,365  | 
            
  | 
        
Total comprehensive income  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            
  | 
            13,565  | 
            6,492  | 
            20,057  | 
            
  | 
        
Transfer to retained earnings  | 
            
  | 
            
  | 
            
  | 
            (14)  | 
            
  | 
            
  | 
            5  | 
            
  | 
            12  | 
            
  | 
            
  | 
            
  | 
            
  | 
            (2)  | 
            0  | 
            0  | 
            0  | 
            
  | 
        
Balance at September 30, 2022  | 
            12,765  | 
            (36)  | 
            62,161  | 
            (34,441)  | 
            6,987  | 
            3,395  | 
            (15)  | 
            
  | 
            218  | 
            (77)  | 
            643  | 
            40  | 
            0  | 
            (207)  | 
            51,435  | 
            43,040  | 
            94,475  | 
            
  |