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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Accumulated Amortization	$ 446		$ 421
Intangible Assets, Net (Excluding Goodwill)	837		832
Intangible Assets, Gross (Excluding Goodwill)	1,283		1,253
Amortization of intangible assets	$ 76	$ 70
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	25		19
Finite-life intangibles, Net Carrying Amount	$ 106		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	158		145
Finite-life intangibles, Net Carrying Amount	$ 187		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	5 years
Finite-life intangibles, Gross Carrying Amount	$ 442		432
Finite-life intangibles, Accumulated Amortization	258		253
Finite-life intangibles, Net Carrying Amount	184		179
Accumulated amortization for intangibles written off	47
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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