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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit) | $ 272 | $ 272 |  | $ 59 |  |
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit), one-time transition tax |  |  |  | 16 |  |
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit), charge to record valuation allowance on U.S. foreign tax credits |  |  |  | $ 43 |  |
Percentage of temporary tax differences that reverse within the carryforward period |  |  | 27.00% |  |  |
Percentage of deferred tax asset exclusive of reversing temporary differences |  |  | 73.00% |  |  |
Changes in valuation allowances |  |  | (14.20%) | 0.90% | 137.90% |
Deferred tax asset, increase (decrease), amount, foreign tax credit |  |  |  | $ 46 | $ 9 |
Deferred tax assets, tax credit carryforwards, foreign, expired during period |  |  | $ 88 | 8 | 57 |
Deduction of foreign taxes |  |  | 113 |  |  |
Deferred tax assets, valuation allowance, foreign tax credit |  |  | 216 |  |  |
Valuation allowance, amount released |  |  | 13 | 10 |  |
Valuation allowance | 2,584 | 2,584 | 2,256 | 2,486 | 2,584 | $ 1,940
Increase (decrease) to valuation allowance |  |  | 37 | 136 | $ 831 |
Valuation allowance, changes due to losses no longer supported by temporary differences |  |  |  | 20 |  |
Deferred tax assets, other |  |  | $ 52 | $ 94 |  |
Percentage of the effect of unrecognized tax benefit, if recorded |  |  | 13.00% | 5.00% | 15.00% |
Interest or penalties recognized |  |  | $ 6 | $ 22 | $ 1 |
Income related to accrued interest and penalties |  |  | 0 | 1 | 2 |
Amount accrued for payment of interest and penalties | $ 2 | $ 2 | 23 | 21 | 2 |
Foreign Tax Authority |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Increase (decrease) to valuation allowance |  |  |  | 61 | $ 675 |
Tax Authority, Spain | Foreign Tax Authority |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Increase (decrease) to valuation allowance |  |  |  | 92 |  |
Other Net State Deferred Tax Asset |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Valuation allowance |  |  |  | $ 672 |  |
Capital Loss Carryforward |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Valuation allowance, amount released |  |  | $ 10 |  |  |

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