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Investments - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) loan	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) loan
Debt Securities, Available-for-sale [Line Items]
Investment, non-income producing, greater than twelve months	$ 69,000,000		$ 47,000,000
Accrued interest receivable	516,000,000		481,000,000
FHLB collateral pledged	4,518,000,000		4,345,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses	40,000,000		$ 42,000,000
Allowance for credit loss for securities in an unrealized loss position	$ 0
Commercial mortgage loans, percentage of investments	5.00%		5.00%
DSC ratio, amortization period	25 years
Mortgage loans delinquent in principal or interest | loan	0
Amortized cost of loans on non-accrual	$ 66,000,000		$ 57,000,000
Loans in process of foreclosure	58,000,000		$ 41,000,000
Gross investment income	780,000,000	$ 673,000,000
Reinsurance agreement, recognized gains (losses)	(19,000,000)	(22,000,000)
Funds Withheld, Reinsurance Agreements
Debt Securities, Available-for-sale [Line Items]
Gross investment income	$ 127,000,000	$ 58,000,000
United States
Debt Securities, Available-for-sale [Line Items]
Residential mortgage loans, location percentage	100.00%
Commercial mortgage loans
Debt Securities, Available-for-sale [Line Items]
Mortgage loans delinquent in principal or interest | loan			0
Charge offs	$ 0		$ 3,000,000
Amortized cost of loans on non-accrual	$ 0		0
Commercial mortgage loans | 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 loans
Debt Securities, Available-for-sale [Line Items]
Residential mortgage loans, percentage of total investments	5.00%
Charge offs	$ 0
Amortized cost of loans on non-accrual	$ 66,000,000		57,000,000
Residential mortgage loans | 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	$ 145,000,000		$ 141,000,000

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