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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Income taxes expense (benefit)	$ (76)	$ (22)	$ (30)	$ 32
Income taxes percentage on pre-tax income (loss)	30.00%
Pre-tax income (loss)	$ (250)	$ (5,978)	$ 1,004	$ (5,290)
Provisional estimate for one-time deemed repatriation tax liability					$ 112
Israel Tax Authority [Member]
Income Taxes [Line Items]
Statutory Israeli corporate tax rate			23.00%

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Income Taxes [Line Items]

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Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit.

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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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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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