Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Accumulated Amortization	$ 466		$ 421
Intangible Assets, Net (Excluding Goodwill)	839		832
Intangible Assets, Gross (Excluding Goodwill)	1,305		1,253
Amortization of intangible assets	$ 50	$ 46
Contractual Rights
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	17 years
Finite-life intangibles, Gross Carrying Amount	$ 131		131
Finite-life intangibles, Accumulated Amortization	23		19
Finite-life intangibles, Net Carrying Amount	$ 108		112
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	16 years
Finite-life intangibles, Gross Carrying Amount	$ 345		325
Finite-life intangibles, Accumulated Amortization	153		145
Finite-life intangibles, Net Carrying Amount	$ 192		180
Customer Relationships \| OneAmerica
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	13 years
Trademarks
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	8 years
Finite-life intangibles, Gross Carrying Amount	$ 15		15
Finite-life intangibles, Accumulated Amortization	5		4
Finite-life intangibles, Net Carrying Amount	$ 10		11
Computer software
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	4 years
Finite-life intangibles, Gross Carrying Amount	$ 464		432
Finite-life intangibles, Accumulated Amortization	285		253
Finite-life intangibles, Net Carrying Amount	179		179
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Gross Carrying Amount	21
Contractual Rights
Finite-Lived Intangible Assets [Line Items]
Indefinite-life intangibles, Gross Carrying Amount	350		350
Indefinite-life intangibles, Net	$ 350		$ 350

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