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Investments - Limited Partnership Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Investment Income [Line Items]
Investment, Type [Extensible Enumeration]	Partnership Interest [Member]	Partnership Interest [Member]
Fair Value Measured at Net Asset Value Per Share
Net Investment Income [Line Items]
Alternative investments	$ 262	$ 251
Unfunded additional commitments	133
Net gains (losses) from limited partnership investments	$ 0	$ 0	$ (284)

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Amount of financial support committed by investment company to investee that is contractually required.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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