Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 6,655	$ 6,666
Other intangible assets, net	5,548	5,725
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net	5,147	5,325
Accumulated amortization	2,949	2,779
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net	386	378
Accumulated amortization	356	349
Trade names
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net	15	22
Accumulated amortization	$ 115	$ 109