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Investments - Limited Partnership (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
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	$ 290		$ 290		$ 251
Unfunded additional commitments	153		153
Net gains (losses) from limited partnership investments	$ 0	$ 0	$ 0	$ 0

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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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Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company.

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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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