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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Other | $ 413 |  | $ 413 |
Deferred Tax Assets, Tax Credit Carryforwards | 2 |  | 8 |
Income Tax Examination, Penalties and Interest Expense | 1 | $ 0 | 1 | $ 0
Income Tax Examination, Interest Accrued | 0 | $ 0 | 0 | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 |  | 0 |
Income Tax Examination, Penalties Accrued | $ 0 |  | 0 |
UNITED STATES |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Other Tax Expense (Benefit) |  |  | 225 |
UNITED KINGDOM |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Other Tax Expense (Benefit) |  |  | 1 |
Alternative Minimum Tax (AMT) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Proceeds from Income Tax Refunds |  |  | $ 421 |

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