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Investments - Limited Partnership (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Net Investment Income [Line Items]
Investment, Type [Extensible Enumeration]	Partnership Interest [Member]		Partnership Interest [Member]		Partnership Interest [Member]
Fair Value Measured at Net Asset Value Per Share
Net Investment Income [Line Items]
Alternative investments	$ 246		$ 246		$ 262
Unfunded additional commitments	142		142
Net gains (losses) from limited partnership investments	$ 0	$ 0	$ 0	$ 0

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- Definition

Alternative Investment, Net Gain (Loss)

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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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