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Investments - Narrative (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2025 USD ($) loan	Mar. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Investment, non-income producing, greater than twelve months	$ 33,000,000			$ 32,000,000
Accrued interest receivable	484,000,000			476,000,000
FHLB collateral pledged	4,740,000,000			4,289,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses	85,000,000			67,000,000
Allowance for credit loss for securities in an unrealized loss position	$ 0
Commercial mortgage loans, percentage of investments	4.00%
DSC ratio, amortization period	25 years
Amortized cost of loans on non-accrual	$ 82,000,000			94,000,000
Loans in process of foreclosure	77,000,000			81,000,000
Gross investment income	824,000,000	$ 780,000,000
Reinsurance agreement, recognized gains (losses)	(42,000,000)	(19,000,000)
Funds Withheld, Reinsurance Agreements
Debt Securities, Available-for-sale [Line Items]
Gross investment income	$ 184,000,000	$ 127,000,000
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
Amortized cost of loans on non-accrual	$ 10,000,000			9,000,000
Interest receivable	$ 9,000,000			$ 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%			5.00%
Charge offs	$ 0		$ 0
Amortized cost of loans on non-accrual	72,000,000			$ 85,000,000
Interest receivable	$ 31,000,000			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	$ 149,000,000			$ 997,000,000

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