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Revenue - Incremental Direct Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]        
Incremental direct costs of obtaining a contract $ 13 $ 18 $ 28 $ 36
Amortization of incremental direct costs $ 20 $ 20 $ 41 $ 43