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Revenue - Incremental Direct Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]        
Incremental direct costs of obtaining a contract $ 15 $ 20 $ 43 $ 56
Amortization of incremental direct costs $ 19 $ 23 $ 60 $ 66