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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax rate | (195.10%) | (22.30%) | 41.80% | 74.10% |
Valuation Allowance Rollforward [Roll Forward] |  |  |  |  |
Balance at beginning of year |  |  | $ 2,324 |  |
Additions to valuation allowance charged to income tax expense |  |  | 673 |  |
Reductions to valuation allowance credited to income tax benefit |  |  | (145) |  |
Foreign currency translation |  |  | 4 |  |
Balance at end of period | $ 2,856 |  | 2,856 |  |
Unrecognized tax benefits | 74 |  | 74 |  | $ 64
Unrecognized tax benefits that would impact the effective tax rate | 41 |  | 41 |  | 40
Possible decrease in unrecognized tax benefits | 8 |  | 8 |  |
Unrecognized tax benefits that would impact deferred taxes | $ 33 |  | $ 33 |  | $ 24

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