Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2024
Finite-Lived and Indefinite-Lived Intangible Assets
Finite lived intangible assets, net	$ 4,237	$ 4,237	$ 3,569
Customer relationships
Finite-Lived and Indefinite-Lived Intangible Assets
Finite lived intangible assets, net	3,810	3,810	3,196
Accumulated amortization	3,896	3,896	4,504
Loss on intangible asset disposition	73	121
Capitalized software
Finite-Lived and Indefinite-Lived Intangible Assets
Finite lived intangible assets, net	427	427	373
Accumulated amortization	$ 419	$ 419	$ 451