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Software, net - Summary of Software and Amortization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]
Software	$ 1,168		$ 1,151
Accumulated amortization	(973)		(960)
Software, net	195		$ 191
Amortization expense	$ 23	$ 19
Software, Internally Developed \| Minimum
Intangible Asset, Finite-Lived [Line Items]
Intangible Asset, Finite-Lived, Useful Life	2 years
Software, Internally Developed \| Maximum
Intangible Asset, Finite-Lived [Line Items]
Intangible Asset, Finite-Lived, Useful Life	10 years
External Use Software \| Minimum
Intangible Asset, Finite-Lived [Line Items]
Intangible Asset, Finite-Lived, Useful Life	2 years
External Use Software \| Maximum
Intangible Asset, Finite-Lived [Line Items]
Intangible Asset, Finite-Lived, Useful Life	10 years