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Business Dispositions and Discontinued Operations - Major Classes of Assets and Liabilities Transferred by the Company to the Buyer in Connection with Sale (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 03, 2017
--- | --- | --- | ---
Assets |  |  |
Assets | $ 156,551 | $ 164,936 |
Liabilities |  |  |
Liabilities | 154,194 | 162,442 |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business |  |  |
Assets |  |  |
Cash and investments | 29,227 | 30,135 |
Reinsurance recoverables | 20,701 | 20,785 |
Loss accrual | (3,195) | (3,257) |
Other assets | 1,425 | 1,439 |
Separate account assets | 108,393 | 115,834 |
Assets | 156,551 | 164,936 |
Liabilities |  |  |
Reserve for future policy benefits and unpaid loss and loss adjustment expenses | 14,282 | 14,482 |
Other policyholder funds and benefits payable | 28,921 | 29,228 |
Long-term debt | 142 | 142 | $ 142
Other liabilities | 2,456 | 2,756 |
Separate account liabilities | 108,393 | 115,834 |
Liabilities | $ 154,194 | $ 162,442 |

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