Investments - Mortgage Loans- ACL (Details) $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans serviced on behalf of third parties	$ 4,800	$ 4,400
Financing Receivable, Modifications, Number of Contracts	1	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 44	$ 51	$ 36	$ 29
Financing Receivable, Credit Loss, Expense (Reversal)	(3)	15	7
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (4)	$ 0	$ 0
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	1.00%
Commercial Loan [Member] \| Extended Maturity
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Modified in Period, Amount	$ 9

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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