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Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | $ 113,519 | $ 105,200 |  |
Trading securities | 4,651 | 4,673 |  |
Equity securities | 87 | 103 |  |
Mortgage loans on real estate | 16,578 | 16,339 |  |
Derivative investments | 2,957 | 1,911 |  |
Other investments | 4,574 | 2,994 |  |
Cash and invested cash | 4,201 | 2,563 | $ 3,314 | $ 2,345
Accrued investment income | 1,168 | 1,148 |  |
Athene Holding Ltd. [Member] |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | 1,710 | 2,308 |  |
Trading securities | 3,580 | 3,534 |  |
Equity securities | 15 | 14 |  |
Derivative investments | 95 | 130 |  |
Other investments | 105 | 94 |  |
Cash and invested cash | 76 | 62 |  |
Accrued investment income | 51 | 57 |  |
Total | 6,409 | 6,897 |  |
Commercial [Member] |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Mortgage loans on real estate | 15,868 | 15,606 |  |
Commercial [Member] | Athene Holding Ltd. [Member] |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Mortgage loans on real estate | $ 777 | $ 698 |  |

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