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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Discrete income tax expense (benefit) | $ (9) | $ (152) | $ (5) |  | $ (122) |  |
Income tax benefit | 9 |  | 6 |  | 151 | $ 0 |
Pre-tax income (loss) | $ (10) |  | $ 4 |  | $ (27) | $ (1) |
Effective tax rate (percentage) | 90.00% |  | (150.00%) |  | 559.30% | 0.00% |
Income tax expense (benefit), marginal tax rate adjustment |  |  |  |  | $ 29 |  |
Discrete tax expense related to an uncertain tax position |  |  |  | $ 4 |  |  |
Discrete tax benefit related to intra-entity asset transfer |  | $ 157 |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Effective tax rate (percentage) |  |  |  |  |  |  | 279.00%

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