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Income Taxes - Deferred Tax Assets and Valuation Allowances (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Valuation Allowance [Line Items] |  |
Deferred tax assets related to operating loss carryovers | $ 1,261 | $ 1,249
Deferred tax assets related to general business, alternative minimum and foreign tax credits | 258 | 260
Deferred tax assets related to capital losses |  | 17
Valuation allowance related to deferred tax assets | 155 | 178
Change in valuation allowance | 23 |
Net Operating Loss Carryovers Tax Credits and Capital Losses |  |
Valuation Allowance [Line Items] |  |
Valuation allowance related to deferred tax assets | 117 | $ 140
Capital Loss Carryforward |  |
Valuation Allowance [Line Items] |  |
Change in valuation allowance | $ 18 |

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