Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 9,360	$ 9,360
Finite-lived intangible assets, net	170	199
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	0	0
Accumulated amortization	0	5,699
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	170	199
Accumulated amortization	1,892	$ 1,876
Fully Amortized And Retired Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 5,700