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Investments - Schedule of Portfolio Composition (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Investments [Abstract]    
Fixed income securities, at fair value $ 52,576 $ 48,865
Equity securities, at fair value 2,216 2,411
Mortgage loans, net 815 822
Limited partnership interests 8,730 8,380
Short-term investments, at fair value 5,288 5,144
Other investments, net 979 1,055
Total investments $ 70,604 $ 66,677