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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating $ 3,288 $ 3,246 $ 2,667
Investment Income, Investment Expense (127) (108) (92)
Investment income, net of related expenses 3,161 3,138 2,575
Available-for-sale Securities [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 2,305 2,059 1,928
Equity Securities [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 6 5 6
Mortgage Loans on Real Estate [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 298 293 282
Policy Loans [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 54 55 56
Funds Withheld At Interest [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 253 351 279
Short-term Investments [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 29 3 7
Other Aggregated Investments [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 12 61 59
Partnership Interest [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating $ 331 $ 419 $ 50