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Revenues - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]      
Revenues recognized from performance obligations satisfied in prior years $ 851 $ 841 $ 741
Revenues recognized 856 101 $ 257
Contract assets $ 174 $ 198