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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2020
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) | $ 27,000,000 | $ (186,000,000) | $ 42,000,000 | $ 63,000,000 |  |
Income (loss) before income taxes | 98,000,000 | (889,000,000) | 131,000,000 | (1,257,000,000) |  |
Net discrete tax adjustments | $ 2,000,000 | 2,000,000 | $ 29,000,000 | 293,000,000 |  |
U.S. statutory rate | 21.00% |  | 21.00% |  |  |
Non-cash goodwill impairment charge |  | $ 182,000,000 |  | $ 182,000,000 |  |
Deferred tax asset, tax credit carryforwards, foreign | $ 150,000,000 |  | $ 150,000,000 |  | $ 133,000,000 |
Foreign Tax Authority |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  | 0 |  |  |
Tax credit carryforward, valuation allowance | 328,000,000 |  | 328,000,000 |  |  | $ 295,000,000
Valuation allowance | 1,100,000,000 |  | 1,100,000,000 |  | 1,100,000,000 |
Deferred tax assets | 1,400,000,000 |  | $ 1,400,000,000 |  | 1,300,000,000 |
Foreign Tax Authority | Luxembourg |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation allowance |  |  |  |  | 933,000,000 |
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 | 800,000,000 |  | $ 800,000,000 |  | $ 1,200,000,000 |
Net deferred tax assets, unlimited lives | 500,000,000 |  | 500,000,000 |  |  |
Net deferred tax assets, limited lives | 300,000,000 |  | $ 300,000,000 |  |  |
Net deferred tax assets, expiration period |  |  | between 2025 and 2041 |  |  |
Valuation allowance | $ 368,000,000 |  | $ 368,000,000 |  |  |

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