Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Customer relationships and other intangible assets, net	$ 4,067	$ 4,237
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Customer relationships and other intangible assets, net	3,655	3,810
Accumulated amortization	4,047	3,896
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Customer relationships and other intangible assets, net	412	427
Accumulated amortization	$ 431	$ 419