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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income from domestic operations |  | $ 2,644,000,000 | $ 1,753,000,000 | $ 704,000,000
Losses from foreign operations |  | (84,000,000) | 0 | 19,000,000
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount |  | 0 | (39,000,000) | 877,000,000
Deferred Tax Assets, Operating Loss Carryforwards |  | 84,000,000 | 521,000,000 |
Current State and Local Tax Expense (Benefit) |  | 5,000,000 | 4,000,000 | 5,000,000
Deferred Tax Assets, Valuation Allowance |  | 4,000,000 | 0 |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) |  |  |  | 877,000,000
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense |  |  |  | 821,000,000
Tax Cuts and Jobs Act of 2017, Deferred Tax Asset, Income Tax Expense (Benefit), Sequestration Fee Payable |  |  | 56,000,000 | 56,000,000
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) |  |  | 17,000,000 |
Tax Cuts and Jobs Act, Accounting Complete, Date |  |  | 39,000,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  | 410,000,000 |  |
Income Tax Credits and Adjustments |  | 11,000,000 |  |
Income Tax Examination, Penalties and Interest Expense |  | 1,000,000 | 0 | $ 0
Income Tax Examination, Interest Accrued |  | 0 | 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 0 |  |
Income Tax Examination, Penalties Accrued |  | 0 |  |
Alternative Minimum Tax (AMT) credits [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from Income Tax Refunds | $ 421,000,000 |  |  |
UNITED STATES |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards |  | 77,000,000 |  |
UNITED KINGDOM |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards |  | 3,000,000 |  |
Foreign Tax Authority [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards |  | 4,000,000 |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards |  |  | $ 477,000,000 |
Income Taxes Receivable, Current |  | $ 5,000,000 |  |

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