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Income Taxes - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Before Income Taxes And Income Tax Expense Benefit [Line Items]
Income (Loss) before income taxes		$ (4,406)	$ (1,265)	$ (2,596)
Statutory tax rate in Israel		23.00%	23.00%	23.00%
Theoretical provision for income taxes		$ (1,013)	$ (291)	$ (597)
Increase (decrease) in the provision for income taxes due to:
The Parent Company and its Israeli subsidiaries- Mainly tax benefits arising from reduced tax rates under benefit programs		(183)	(44)	(134)
Non-Israeli subsidiaries, including impairments	[1]	1,369	(115)	381
U.S. Tax Cuts and Jobs Act effect				97
Increase (decrease) in other uncertain tax positions-net		(341)	172	58
Effective consolidated income taxes		$ (168)	$ (278)	$ (195)
[1] In 2020 and 2018, income before income taxes includes goodwill impairment in non-Israeli subsidiaries that did not have a corresponding tax effect.

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