Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 6,955	$ 6,955
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, less accumulated amortization	99	103
Accumulated amortization	$ 1,958	$ 1,966