Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]
Finite-life intangibles, Accumulated Amortization	$ 502		$ 473
Intangible Asset, Excluding Goodwill, after Accumulated Amortization	864		874
Intangible Asset, Excluding Goodwill, before Accumulated Amortization	1,366		1,347
Amortization of intangible assets	$ 29	$ 25
Contractual Rights
Intangible Asset, Finite-Lived [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	17 years
Finite-life intangibles, Gross Carrying Amount	$ 131		131
Finite-life intangibles, Accumulated Amortization	29		27
Finite-life intangibles, Net Carrying Amount	$ 102		104
Customer Relationships
Intangible Asset, Finite-Lived [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	16 years
Finite-life intangibles, Gross Carrying Amount	$ 345		345
Finite-life intangibles, Accumulated Amortization	167		162
Finite-life intangibles, Net Carrying Amount	$ 178		183
Trademarks
Intangible Asset, Finite-Lived [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	8 years
Finite-life intangibles, Gross Carrying Amount	$ 15		15
Finite-life intangibles, Accumulated Amortization	6		6
Finite-life intangibles, Net Carrying Amount	$ 9		9
Software, In-Development, Internally Developed, and Purchased
Intangible Asset, Finite-Lived [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	5 years
Finite-life intangibles, Gross Carrying Amount	$ 525		506
Finite-life intangibles, Accumulated Amortization	300		278
Finite-life intangibles, Net Carrying Amount	225		228
Contractual Rights
Intangible Asset, Finite-Lived [Line Items]
Indefinite-life intangibles, Gross Carrying Amount	350		350
Indefinite-life intangibles, Net	$ 350		$ 350

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