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Income Taxes - Deferred Tax Assets and Valuation Allowances (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Valuation Allowance [Line Items] |  |
Net operating loss carryforwards | $ 1,484 | $ 1,261
Tax credit carryforwards | 257 | 258
Valuation allowance related to deferred tax assets | 138 | 155
Change in valuation allowances | (17) |
Net Operating Loss Carryovers Tax Credits and Capital Losses |  |
Valuation Allowance [Line Items] |  |
Valuation allowance related to deferred tax assets | 100 | $ 117
Operating Loss Carryforward | State and Local Jurisdiction |  |
Valuation Allowance [Line Items] |  |
Change in valuation allowances | (9) |
Operating Loss Carryforward | Foreign Tax Authority |  |
Valuation Allowance [Line Items] |  |
Change in valuation allowances | $ (8) |

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