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Revenue - Capitalized Contract Cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]        
Incremental direct costs of obtaining a contract $ 15 $ 17 $ 28 $ 30
Amortization of incremental direct costs $ 16 $ 18 $ 34 $ 37