XML 63 R48.htm IDEA: XBRL DOCUMENT v3.21.2
Revenue - Capitalized Contract Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]        
Incremental direct costs of obtaining a contract $ 14 $ 15 $ 44 $ 43
Amortization of incremental direct costs $ 18 $ 19 $ 55 $ 60