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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 | Dec. 31, 2017 | Dec. 03, 2017 | May 10, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Assets | $ 164,936 |  |  | $ 169,020
Liabilities |  |  |  |
Liabilities | 162,442 |  |  | 163,534
P&C Runoff Subsidiaries |  |  |  |
Assets |  |  |  |
Assets |  |  |  | 870
Liabilities |  |  |  |
Liabilities |  |  |  | 611
Disposal Group, Disposed of by Sale, Not Discontinued Operations | P&C Runoff Subsidiaries |  |  |  |
Assets |  |  |  |
Cash and investments |  |  | $ 669 | 657
Reinsurance recoverables |  |  | 268 | 213
Assets |  |  | 937 |
Liabilities |  |  |  |
Reserve for future policy benefits and unpaid loss and loss adjustment expenses |  |  | 653 | 600
Other liabilities |  |  | $ 12 | 11
Liabilities | 665 |  |  |
Intercompany reinsurance recoverables |  |  |  | 0
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business |  |  |  |
Assets |  |  |  |
Cash and investments | 30,135 |  |  | 31,433
Reinsurance recoverables | 20,785 |  |  | 20,364
Loss accrual | (3,257) |  |  | 0
Other assets | 1,439 |  |  | 688
Separate account assets | 115,834 |  |  | 115,665
Assets | 164,936 |  |  | 168,150
Liabilities |  |  |  |
Reserve for future policy benefits and unpaid loss and loss adjustment expenses | 14,482 |  |  | 13,609
Other policyholder funds and benefits payable | 29,228 |  |  | 30,574
Long-term debt | 142 | $ 142 |  | 142
Other liabilities | 2,756 |  |  | 2,933
Separate account liabilities | 115,834 |  |  | 115,665
Liabilities | $ 162,442 |  |  | $ 162,923

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