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Investments - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) loan
Debt Securities, Available-for-sale [Line Items]
Investment, non-income producing, greater than twelve months	$ 33,000,000		$ 33,000,000		$ 32,000,000
Accrued interest receivable	522,000,000		522,000,000		476,000,000
FHLB collateral pledged	4,475,000,000		4,475,000,000		4,289,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses	102,000,000		102,000,000		$ 67,000,000
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
Amortized cost of loans on non-accrual	$ 82,000,000		$ 82,000,000		$ 94,000,000
Loans in process of foreclosure	72,000,000		72,000,000		$ 81,000,000
Gross investment income	924,000,000	$ 891,000,000	2,593,000,000	$ 2,526,000,000
Reinsurance agreement, recognized gains (losses)	(77,000,000)	177,000,000	(176,000,000)	(186,000,000)
Funds Withheld, Reinsurance Agreements
Debt Securities, Available-for-sale [Line Items]
Gross investment income	$ 219,000,000	$ 77,000,000	$ 592,000,000	$ 463,000,000
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
Amortized cost of loans on non-accrual	$ 10,000,000		$ 10,000,000		$ 9,000,000
Interest receivable	$ 11,000,000		$ 11,000,000		$ 8,000,000
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	6.00%		6.00%		5.00%
Charge offs			$ 0		$ 0
Amortized cost of loans on non-accrual	$ 72,000,000		72,000,000		85,000,000
Interest receivable	36,000,000		$ 36,000,000		28,000,000
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	$ 154,000,000		$ 154,000,000		$ 997,000,000

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