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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense benefit | $ 272 |  |  | $ 59
Transition tax |  |  |  | 16
Deferred tax balance |  |  |  | 43
Percentage of temporary tax differences that reverse within the carryforward period |  | 15.00% |  |
Percentage of deferred tax asset exclusive of reversing temporary differences |  | 85.00% |  |
Valuation allowances |  |  |  | 46
Foreign tax credits |  |  | $ 88 | 8
Deduction of foreign taxes |  |  | 113 |
Cumulative amount of valuation allowance |  | $ 216 |  |
Valuation allowance | $ 2,459 | 2,307 | 2,121 | 2,357
Increase (decrease) to valuation allowance |  | $ 136 | $ 19 | 119
Valuation allowance, changes due to losses no longer supported by temporary differences |  |  |  | $ 20
Percentage of the effect of unrecognized tax benefit, if recorded |  | 1.00% | 36.00% | 11.00%
Interest or penalties recognized |  | $ 2 | $ 6 | $ 22
Income related to accrued interest and penalties |  | 25 | 0 | 1
Amount accrued for payment of interest and penalties |  | 2 | 23 | 21
Domestic Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance, amount released |  | 20 | 11 |
Increase (decrease) to valuation allowance |  | 58 | 5 |
Foreign Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Increase (decrease) to valuation allowance |  |  |  | 61
Tax Authority, Spain | Foreign Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Increase (decrease) to valuation allowance |  | 104 |  | $ 92
Other Net State Deferred Tax Asset |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance |  |  | 609 |
Capital Loss Carryforward |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance, amount released |  | $ 1 | $ 9 |

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