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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Income Taxes [Line Items] |  |  |
Income tax expense (benefit) | $ 15 | $ 249 |
Income (loss) before income taxes | 33 | (368) |
Net discrete tax adjustments | $ 3 | $ 290 |
U.S. statutory rate | 21.00% | 21.00% |
Non-cash goodwill impairment charge | $ 0 | $ 182 |
Deferred tax asset, tax credit carryforwards, foreign | 140 |  | $ 133
Foreign Tax Authority |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforward, valuation allowance | 328 | $ 295 |
Valuation allowance | 1,000 |  | 1,100
Deferred tax assets | 1,200 |  | 1,300
Foreign Tax Authority | Luxembourg |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowance | $ 923 |  |
Foreign Tax Authority | Beginning Year |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforward expiration year | 2025 |  |
Foreign Tax Authority | Ending Year |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforward expiration year | 2031 |  |
Domestic and State and Local Authority |  |  |
Income Taxes [Line Items] |  |  |
Net deferred tax assets | $ 1,200 |  | 1,200
Net deferred tax assets, unlimited lives | 900 |  |
Net deferred tax assets, limited lives | $ 300 |  |
Net deferred tax assets, expiration period | between 2025 and 2041 |  |
Valuation allowance | $ 368 |  | $ 368

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