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Income Taxes - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Before Income Taxes And Income Tax Expense Benefit [Line Items]
Income (loss) before income taxes	$ (2,596)	$ (18,379)	$ 824
Statutory tax rate in Israel	23.00%	24.00%	25.00%
Theoretical provision for income taxes	$ (597)	$ (4,411)	$ 206
Increase (decrease) in effective tax rate due to:
The Parent Company and its Israeli subsidiaries- Mainly tax benefits arising from reduced tax rates under benefit programs	(134)	(253)	(212)
Non-Israeli subsidiaries, including impairments	381	3,817	546
U.S. Tax Cuts and Jobs Act effect	97	(1,061)
Increase (decrease) in other uncertain tax positions-net	58	(25)	(19)
Effective consolidated income taxes	$ (195)	$ (1,933)	$ 521

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

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