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Investments - Carrying Value of Measurement Alternative Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Alternative Investment, Initial Cost Basis $ 534  
Alternative Investment, Upward Price Adjustment, Cumulative Amount 629  
Alternative Investment, Downward Price Adjustment Including Impairment, Cumulative Amount (178)  
Measurement alternative $ 985 $ 1,087