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Property, Equipment, and Capitalized Software, Net - Depreciation and Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Recorded in depreciation and amortization:      
Amortization of capitalized software $ 38 $ 33 $ 42
Depreciation and amortization of furniture, equipment, building, and improvements 16 21 36
Amortization of intangible assets 15 18 21
Amortization of finance leases 19 17 0
Subtotal 88 89 99
Recorded in cost of service revenue:      
Amortization of capitalized software and deferred contract costs 0 0 28
Total depreciation and amortization recognized $ 88 $ 89 $ 127