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Investments - Net Investment Income (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Investment
Dec. 31, 2021
USD ($)
Investment
Dec. 31, 2020
USD ($)
Net Investment Income [Line Items]      
Investment income, operating $ 1,886 $ 2,334 $ 2,071
Investment expenses (84) (75) (76)
Net investment income 1,802 2,259 1,995
Net investment income recognized due to the change in fair value of equity and trading portfolio securities held as of December 31, 2022, 2021 and 2020 $ 3 $ 23 88
Number of investments in single issuer exceeding 10% | Investment 0 0  
Fixed maturity securities      
Net Investment Income [Line Items]      
Investment income, operating $ 1,787 $ 1,707 1,728
Limited partnership investments      
Net Investment Income [Line Items]      
Gain (losses) on investments, before investment expenses (6) 375 127
Short term investments      
Net Investment Income [Line Items]      
Investment income, operating 17 2 10
Equity securities      
Net Investment Income [Line Items]      
Investment income, operating 23 83 65
Income from trading portfolio      
Net Investment Income [Line Items]      
Gain (losses) on investments, before investment expenses 106 83
Other      
Net Investment Income [Line Items]      
Investment income, operating $ 65 $ 61 $ 58