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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
IncomeTaxesLineItems [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ 11 | $ (26) | $ (159) | $ (56)
Effective Income Tax Rate Reconciliation, Percent |  |  | 12.00% | 13.00% |
Pre-tax income (loss) |  | $ (292) | $ (213) | $ (1,226) | $ 791
Subsequent Event [Member] |  |  |  |  |
IncomeTaxesLineItems [Line Items] |  |  |  |  |
Expected impairment of income tax benefit | $ 146 |  |  |  |
Israel Tax Authority [Member] |  |  |  |  |
IncomeTaxesLineItems [Line Items] |  |  |  |  |
Statutory Israeli corporate tax rate |  |  |  | 23.00% |

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