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Business Dispositions and Discontinued Operations - Reconciliation of the Major Line Items Constituting Pretax Profit (Loss) of Discontinued Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Benefits, losses and expenses |  |  |
Net realized capital loss on disposal, net of tax | $ (3,257) | $ (81) | $ 6
(Loss) income from discontinued operations, net of tax | (2,869) | 283 | 493
Run-Off Life and Annuity Business | Discontinued Operations, Held-for-sale |  |  |
Revenues |  |  |
Earned premiums | 106 | 114 | 92
Fee income and other | 912 | 931 | 1,040
Net investment income | 1,289 | 1,384 | 1,469
Net realized capital losses | (53) | (158) | (144)
Total revenues | 2,254 | 2,271 | 2,457
Benefits, losses and expenses |  |  |
Benefits, losses and loss adjustment expenses | 1,416 | 1,390 | 1,450
Amortization of DAC | 45 | 146 | 138
Insurance operating costs and other expenses | 368 | 378 | 367
Total benefits, losses and expenses | 1,829 | 1,914 | 1,955
Income before income taxes | 425 | 357 | 502
Income tax expense | 37 | 74 | 16
Income from operations of discontinued operations, net of tax | 388 | 283 | 486
Net realized capital loss on disposal, net of tax | (3,257) | 0 | 0
(Loss) income from discontinued operations, net of tax | $ (2,869) | $ 283 | $ 486

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