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Investments - Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Alternative Investment, Initial Cost Basis	$ 534
Alternative Investment, Upward Price Adjustment, Cumulative Amount	636
Alternative Investment, Downward Price Adjustment Including Impairment, Cumulative Amount	(182)
Measurement alternative	$ 988	$ 1,008

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- Definition

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