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Investments (Details) - Impairment Charges - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investment Information      
Fixed maturities credit impairment charges $ 26 $ 2 $ 15
Total net impairment charges, including credit impairments, reported in net realized investment gains (losses) in the consolidated statement of income 38 2 55
Realized losses included in net realized investment gains (losses) related to real estate impairments 12    
Realized losses included in net realized investment gains (losses) related to other-than-temporary impairment of the carrying value of an equity method investment included in other investments     40
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities [Member]      
Investment Information      
Fixed maturities credit impairment charges 12 0 0
Obligations of U.S. states, municipalities and political subdivisions [Member]      
Investment Information      
Fixed maturities credit impairment charges 14 0 0
Debt securities issued by foreign governments [Member]      
Investment Information      
Fixed maturities credit impairment charges 0 0 0
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities [Member]      
Investment Information      
Fixed maturities credit impairment charges 0 0 0
Corporate and all other bonds [Member]      
Investment Information      
Fixed maturities credit impairment charges $ 0 $ 2 $ 15