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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 785 | $ 667 | $ 1,621 | $ 1,283
Investment expense | (26) | (22) | (50) | (44)
Investment income, net of related expenses | 759 | 645 | 1,571 | 1,239
Available-for-sale Securities [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 516 | 474 | 1,011 | 954
Equity securities |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 1 | 1 | 3 | 3
Mortgage Loans on Real Estate [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 73 | 66 | 139 | 133
Policy loans |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 13 | 14 | 27 | 29
Funds withheld at interest |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 95 | 69 | 179 | 122
Short-term Investments [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 0 | 2 | 1 | 6
Other invested assets |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 87 | $ 41 | $ 261 | $ 36

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