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Revenues And Accounts Receivable - Contract Balances (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]      
Deferred revenue $ 581   $ 597
Revenue recognized related to the contract liability (deferred revenues) $ 102 $ 99