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Investments - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) loan
Debt Securities, Available-for-sale [Line Items]
Investment, non-income producing, greater than twelve months	$ 53,000,000		$ 53,000,000		$ 47,000,000
Accrued interest receivable	531,000,000		531,000,000		481,000,000
FHLB collateral pledged	4,886,000,000		4,886,000,000		4,345,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses	73,000,000		73,000,000		$ 42,000,000
Allowance for credit loss for securities in an unrealized loss position	$ 0		$ 0
Commercial mortgage loans, percentage of investments	5.00%		5.00%		5.00%
DSC ratio, amortization period			25 years
Mortgage loans delinquent in principal or interest | loan	0		0
Amortized cost of loans on non-accrual	$ 62,000,000		$ 62,000,000		$ 57,000,000
Loans in process of foreclosure	63,000,000		63,000,000		$ 41,000,000
Gross investment income	855,000,000	$ 680,000,000	1,636,000,000	$ 1,354,000,000
Reinsurance agreement, recognized gains (losses)	10,000,000	21,000,000	(9,000,000)	(1,000,000)
Funds Withheld, Reinsurance Agreements
Debt Securities, Available-for-sale [Line Items]
Gross investment income	155,000,000	$ 76,000,000	$ 282,000,000	$ 134,000,000
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		$ 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%		5.00%		5.00%
Charge offs			$ 0		$ 0
Amortized cost of loans on non-accrual	$ 62,000,000		$ 62,000,000		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	$ 146,000,000		$ 146,000,000		$ 141,000,000

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