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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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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