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Investments Investments (Limited Partnership Investments) (Details) - Fair Value Measured at Net Asset Value Per Share - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Net Investment Income [Line Items]          
Investment Company, Financial Support to Investee Contractually Required, Amount $ 189   $ 189    
Limited Partnership          
Net Investment Income [Line Items]          
Alternative investments 262   262   $ 573
Net gains (losses) from limited partnership investments $ (62) $ (43) $ (282) $ 122