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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 800 | $ 826 | $ 2,423 | $ 2,447
Investment expense | (31) | (30) | (90) | (80)
Investment income, net of related expenses | 769 | 796 | 2,333 | 2,367
Limited Partner [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 43 | 96 | 281 | 327
Available-for-sale Securities [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 591 | 519 | 1,683 | 1,530
Equity securities |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 2 | 1 | 5 | 4
Mortgage Loans on Real Estate [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 74 | 81 | 223 | 220
Policy loans |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 13 | 14 | 40 | 41
Funds withheld at interest |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 67 | 100 | 175 | 279
Short-term Investments [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 7 | 1 | 11 | 2
Other invested assets |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 3 | $ 14 | $ 5 | $ 44

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