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Investments - Portfolio composition (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Investments [Abstract]    
Fixed income securities, at fair value $ 45,550 $ 42,485
Equity securities, at fair value 2,290 4,567
Mortgage loans, net 823 762
Limited partnership interests 8,150 8,114
Short-term investments, at fair value 5,137 4,173
Other investments, net 1,718 1,728
Total investments $ 63,668 $ 61,829