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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating $ 3,755 $ 3,288 $ 3,246
Investment Income, Investment Expense (164) (127) (108)
Investment income, net of related expenses 3,591 3,161 3,138
Available-for-sale Securities [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 2,753 2,305 2,059
Equity Securities [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 6 6 5
Mortgage Loans on Real Estate [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 324 298 293
Policy Loans [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 54 54 55
Funds Withheld At Interest [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 317 253 351
Short-term Investments [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 99 29 3
Other Aggregated Investments [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 21 12 61
Partnership Interest [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating $ 181 $ 331 $ 419