Income Taxes - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Before Income Taxes And Income Tax Expense Benefit [Line Items]
Income (Loss) before income taxes		$ (1,265)	$ (2,596)	$ (18,379)
Statutory tax rate in Israel		23.00%	23.00%	24.00%
Theoretical provision for income taxes		$ (291)	$ (597)	$ (4,411)
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		(44)	(134)	(253)
Non-Israeli subsidiaries, including impairments	[1]	(115)	381	3,817
U.S. Tax Cuts and Jobs Act effect			97	(1,061)
Increase (decrease) in other uncertain tax positions-net		172	58	(25)
Effective consolidated income taxes		$ (278)	$ (195)	$ (1,933)

[1] In 2019, income before income taxes includes intangible impairments in non-Israeli subsidiaries with a corresponding tax effect. In 2017 and 2018, income before income taxes includes goodwill impairments in non-Israeli subsidiaries that did not have a corresponding tax effect.