Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Intangible assets impairment loss		$ 33
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]		Operating expenses
Indefinite-lived intangible assets, Gross Carrying Amount	$ 350	$ 350
Finite-life intangibles, Gross Carrying Amount	1,253	1,344
Finite-life intangibles, Accumulated Amortization	421	487
Finite-life intangibles, Net Carrying Amount	$ 832	857
Management contract rights
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Lives	17 years
Finite-life intangibles, Gross Carrying Amount	$ 131	153
Finite-life intangibles, Accumulated Amortization	19	11
Finite-life intangibles, Net Carrying Amount	112	142
Finite-lived intangible assets, net, write off	$ 18
Customer relationship lists
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Lives	17 years
Finite-life intangibles, Gross Carrying Amount	$ 325	325
Finite-life intangibles, Accumulated Amortization	145	128
Finite-life intangibles, Net Carrying Amount	$ 180	197
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Lives	8 years
Finite-life intangibles, Gross Carrying Amount	$ 15	15
Finite-life intangibles, Accumulated Amortization	4	2
Finite-life intangibles, Net Carrying Amount	$ 11	13
Computer software
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Lives	5 years
Finite-life intangibles, Gross Carrying Amount	$ 432	501
Finite-life intangibles, Accumulated Amortization	253	346
Finite-life intangibles, Net Carrying Amount	179	155
Management contract rights
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Carrying Amount	350	$ 350
Computer software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, accumulated amortization, write off	$ 156