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Reinsurance (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |  |  |
Reinsurance ACL and deposit assets |  | $ 192 |  |  |
Trading securities | $ 4,019 |  | $ 4,673 |  |
Fixed maturity AFS securities | 102,606 |  | 105,200 |  |
Mortgage loans on real estate | 16,791 |  | 16,339 |  |
Derivative investments | 4,417 |  | 1,911 |  |
Other investments | 4,765 |  | 2,994 |  |
Cash and invested cash | 6,202 |  | 2,563 | $ 1,593 | $ 2,345
Accrued investment income | 1,185 |  | 1,148 |  |
Equity securities | 83 |  | 103 |  |
Athene Holding Ltd. [Member] |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Deposit assets | 6,300 |  | $ 6,600 |  |
Reserves associated with modified coinsurance reinsurance arrangements | 6,200 |  |  |  |
Letter of credit | 188 |  |  |  |
Trading securities | 3,000 |  |  |  |
Fixed maturity AFS securities | 1,800 |  |  |  |
Derivative investments | 49 |  |  |  |
Other investments | 111 |  |  |  |
Cash and invested cash | 378 |  |  |  |
Accrued investment income | 48 |  |  |  |
Equity securities | 14 |  |  |  |
Athene Holding Ltd. [Member] | Over-Collateralization [Member] |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Reserves associated with modified coinsurance reinsurance arrangements | 175 |  |  |  |
Athene Holding Ltd. [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Mortgage loans on real estate | $ 765 |  |  |  |

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