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Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | $ 117,313 | $ 123,044 |  |
Trading securities | 4,365 | 4,501 |  |
Equity securities | 123 | 129 |  |
Mortgage loans on real estate | 17,255 | 16,763 |  |
Derivative investments | 3,453 | 3,109 |  |
Other investments | 3,548 | 3,984 |  |
Cash and invested cash | 1,350 | 1,708 | $ 6,202 | $ 2,563
Accrued investment income | 1,301 | 1,257 |  |
Other assets | 17,298 | 15,960 |  |
Athene Holding Ltd. [Member] |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | 1,357 | 1,531 |  |
Trading securities | 3,293 | 3,357 |  |
Equity securities | 20 | 17 |  |
Mortgage loans on real estate | 875 | 832 |  |
Derivative investments | 106 | 103 |  |
Other investments | 212 | 167 |  |
Cash and invested cash | 81 | 92 |  |
Accrued investment income | 39 | 42 |  |
Other assets | 6 | 3 |  |
Total | 5,989 | 6,144 |  |
Commercial [Member] |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Mortgage loans on real estate | $ 16,489 | $ 16,043 |  |

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