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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income from domestic operations | $ 704,000,000 | $ 521,000,000 | $ 1,517,000,000
Losses from foreign operations | 19,000,000 | (74,000,000) | (39,000,000)
Net income tax expense from income tax reform | 877,000,000 | 0 | 0
Net income tax expense from income tax reform, reduction in deferred tax asset | 821 |  |
Net income tax expense from income tax reform, reduction in deferred tax asset from sequestration fee payable | 56 |  |
AMT tax credits reclassified into income taxes receivables related to income tax reform | 790,000,000 |  |
Income taxes receivable from alternative minimum tax credits | 790,000,000 |  |
Income taxes receivable from alternative minimum tax credits, gross | 846,000,000 |  |
Income taxes receivable from alternative minimum tax credits, sequestration fee payable | 56,000,000 |  |
Foreign tax credit credit carryover, Expected tax benefit, gross | 26,000,000 | 56,000,000 |
Net operating loss carryover, Expected tax benefit, gross | 710,000,000 | 1,458,000,000 |
Stock-based compensation | 15,000,000 | 0 | 0
Tax benefit from investment in solar energy partnerships | 0 | 79,000,000 | 0
Total tax benefit from investment in solar energy partnerships |  | 113,000,000 |
Tax benefit related to sale of business | (5,000,000) | 37,000,000 | $ 0
Income taxes receivable | 811,000,000 | 141,000,000 |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Foreign tax credit credit carryover, Expected tax benefit, gross | 23 |  |
Loss on sale of business | 3,300,000,000 |  |
Net operating loss carryover, Expected tax benefit, gross | 437 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Run-Off U.K. Property and Casualty Subsidiaries |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Total tax benefit from sale of business |  | $ 76,000,000 |
U.S. |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating loss carryforwards | 3,380,000,000 |  |
Net operating loss carryover, Expected tax benefit, gross | 710,000,000 |  |
U.S. | Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating loss carryforwards | $ 437,000,000 |  |

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