18 Contract liabilities

The carrying amount of current and non-current contract liabilities decreased year-on-year from EUR 2.1 billion to EUR 2.0 billion. These mainly comprise deferred revenues. The inclusion of Sprint resulted in an increase in the carrying amount of EUR 0.3 billion. Revenue of EUR 1,343 million (2019: EUR 1,277 million) from contract liabilities that were still outstanding as of December 31, 2019 was realized in the reporting year. Of the total of contract liabilities, EUR 1,625 million (December 31, 2019: EUR 1,608 million) is due within one year.