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Investments - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) loan
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 422,000,000		$ 422,000,000		$ 365,000,000
FHLB collateral pledged	3,543,000,000		3,543,000,000		3,387,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses	35,000,000		35,000,000		39,000,000
Purchases of PCD AFS securities	0	$ 0
Allowance for credit loss for securities in an unrealized loss position	$ 0		$ 0
DSC ratio, amortization period			25 years
Mortgage loans delinquent in principal or interest | loan	1		1
Amortized cost of loans on non-accrual	$ 81,000,000		$ 81,000,000		$ 71,000,000
Gross investment income	680,000,000	511,000,000	1,354,000,000	$ 1,036,000,000
Reinsurance agreement, recognized gains (losses)	21,000,000	151,000,000	(1,000,000)	279,000,000
Funds Withheld, Reinsurance Agreements
Debt Securities, Available-for-sale [Line Items]
Gross investment income	76,000,000	$ 20,000,000	$ 134,000,000	$ 38,000,000
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]
Commercial mortgage loans, percentage of investments			6.00%		6.00%
Mortgage loans delinquent in principal or interest | loan					1
Amortized cost of loans on non-accrual	$ 9,000,000		$ 9,000,000		$ 9,000,000
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	6.00%		6.00%		5.00%
Amortized cost of loans on non-accrual	$ 72,000,000		$ 72,000,000		$ 62,000,000
Loans in process of foreclosure	35,000,000		$ 35,000,000		38,000,000
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	$ 19,993,000,000		$ 19,993,000,000		$ 17,870,000,000

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