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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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