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Investments - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
Investments - Narrative (Details)	Sep. 30, 2026 USD ($) loan	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) loan	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) loan
Debt Securities, Available-for-sale [Line Items]
Securities held as collateral, at fair value	$ 18,000,000		$ 18,000,000		$ 15,000,000
Non-income producing investment fair value	89,000,000		89,000,000		54,000,000
Accrued interest receivable	$ 549,000,000		$ 549,000,000		$ 500,000,000
Debt securities, available-for-sale, accrued interest, after allowance for credit loss, statement of financial position flag	Prepaid expenses and other assets (certain assets held at fair value of $0 in 2026 and $24 in 2025)		Prepaid expenses and other assets (certain assets held at fair value of $0 in 2026 and $24 in 2025)		Prepaid expenses and other assets (certain assets held at fair value of $0 in 2026 and $24 in 2025)
FHLB collateral pledged	$ 5,670,000,000		$ 5,670,000,000		$ 4,621,000,000
Financing receivable, purchased with credit deterioration, amount at purchase price			0		$ 0
Allowance for credit loss for securities in an unrealized loss position	$ 0		$ 0
Commercial mortgage loans, percentage of investments	5.00%		5.00%		5.00%
DSC ratio, amortization period			25 years
Amortized cost of loans on non-accrual	$ 136,000,000		$ 136,000,000		$ 79,000,000
Gross investment income	768,000,000	$ 815,000,000	2,353,000,000	$ 2,291,000,000
Reinsurance agreement, recognized gains (losses)	559,000,000	(77,000,000)	691,000,000	(176,000,000)
Variable Interest Entity, Primary Beneficiary
Debt Securities, Available-for-sale [Line Items]
Maximum loss exposure	$ 888,000,000		$ 888,000,000
Commercial mortgage loans
Debt Securities, Available-for-sale [Line Items]
Loans delinquent in principal or interest payments \| loan	1		1		1
Funds Withheld, Reinsurance Agreements
Debt Securities, Available-for-sale [Line Items]
Gross investment income	$ 291,000,000	$ 219,000,000	$ 782,000,000	$ 592,000,000
90 days or more past due \| Mortgage loans
Debt Securities, Available-for-sale [Line Items]
Mortgage loans in process of foreclosure	$ 135,000,000		$ 135,000,000		$ 111,000,000
United States
Debt Securities, Available-for-sale [Line Items]
Residential mortgage loans, location percentage			100.00%
Residential Mortgages
Debt Securities, Available-for-sale [Line Items]
Percentage of total investments	9.00%		9.00%		7.00%
Charge offs			$ 0		$ 0
Amortized cost of loans on non-accrual	$ 127,000,000		127,000,000		67,000,000
Interest receivable	62,000,000		$ 62,000,000		45,000,000
Residential Mortgages \| Mortgage loans
Debt Securities, Available-for-sale [Line Items]
Allowance for expected credit loss, probability of loss/default model, projected loss, using reasonable forecast period			2 years
Allowance for credit loss, probability of loss/default, using market historical loss experience, period			3 years
Commercial Mortgages
Debt Securities, Available-for-sale [Line Items]
Amortized cost of loans on non-accrual	9,000,000		$ 9,000,000		12,000,000
Interest receivable	$ 13,000,000		$ 13,000,000		$ 11,000,000
Commercial Mortgages \| Mortgage loans
Debt Securities, Available-for-sale [Line Items]
Allowance for expected credit loss, probability of loss/default model, projected loss, using reasonable forecast period			2 years
Allowance for credit loss, probability of loss/default, using market historical loss experience, period			3 years