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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax [Line Items]
Expected impairment of income tax benefit	$ 140
Income tax expense (benefit)		$ 16	$ 11	$ (147)	$ (159)
Pre-tax income (loss)		$ (4,459)	$ (292)	$ (4,543)	$ (1,226)
Israel Tax Authority [Member]
Income Tax [Line Items]
Statutory tax rate in Israel				23.00%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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