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Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

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Investments - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
Investments - Narrative (Details)	Jun. 30, 2026 USD ($) loan	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) loan	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) loan
Debt Securities, Available-for-sale [Line Items]
Investment, non-income producing, greater than twelve months	$ 38,000,000		$ 38,000,000		$ 54,000,000
Accrued interest receivable	584,000,000		584,000,000		542,000,000
FHLB collateral pledged	5,439,000,000		5,439,000,000		4,621,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses	78,000,000		78,000,000		$ 112,000,000
Allowance for credit loss for securities in an unrealized loss position	$ 0		$ 0
Commercial mortgage loans, percentage of investments	5.00%		5.00%		4.00%
DSC ratio, amortization period			25 years
Total non-accrual mortgages	$ 138,000,000		$ 138,000,000		$ 79,000,000
Loans in process of foreclosure	129,000,000		129,000,000		$ 111,000,000
Gross investment income	881,000,000	$ 843,000,000	1,777,000,000	$ 1,668,000,000
Reinsurance agreement, recognized gains (losses)	(82,000,000)	(57,000,000)	132,000,000	(99,000,000)
Variable Interest Entity, Primary Beneficiary
Debt Securities, Available-for-sale [Line Items]
Maximum loss exposure, amount	895,000,000		895,000,000
Funds Withheld, Reinsurance Agreements
Debt Securities, Available-for-sale [Line Items]
Gross investment income	$ 263,000,000	$ 189,000,000	$ 491,000,000	$ 373,000,000
United States
Debt Securities, Available-for-sale [Line Items]
Residential mortgage loans, location percentage			100.00%
Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans delinquent in principal or interest \| loan	1		1		1
Total non-accrual mortgages	$ 9,000,000		$ 9,000,000		$ 12,000,000
Interest receivable	$ 13,000,000		$ 13,000,000		$ 11,000,000
Commercial Mortgage \| 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
Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Residential mortgage loans, percentage of total investments	8.00%		8.00%		6.00%
Charge offs			$ 0		$ 0
Total non-accrual mortgages	$ 129,000,000		129,000,000		67,000,000
Interest receivable	52,000,000		$ 52,000,000		45,000,000
Residential Mortgage \| 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
Fixed maturity securities, available-for-sale
Debt Securities, Available-for-sale [Line Items]
Assets held by insurance regulators	$ 157,000,000		$ 157,000,000		$ 155,000,000