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Investments - Limited Partnership Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Investment, Type [Extensible Enumeration]	Partnership Interest [Member]	Partnership Interest [Member]
Investments, unfunded additional commitments	$ 159
Fair Value Measured at Net Asset Value Per Share
Net Investment Income [Line Items]
Investments	251	$ 249
Investment, (losses) gains recognized	$ (14)	$ (284)	$ 143

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Alternative Investment, Net Gain (Loss)

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

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