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Investments - Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Alternative Investment, Initial Cost Basis	$ 529
Alternative Investment, Upward Price Adjustment, Cumulative Amount	629
Alternative Investment, Downward Price Adjustment Including Impairment, Cumulative Amount	(167)
Measurement alternative	$ 991	$ 1,087

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- Definition

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