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Investments - Limited Partnership (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 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 $ 272   $ 272   $ 251
Unfunded additional commitments 139   139    
Net gains (losses) from limited partnership investments $ 0 $ 0 $ 0 $ 0