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Income Taxes - Schedule of the Provision for Income Taxes (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]      
In Israel $ 131 $ 96 $ 209
Outside Israel (326) (2,029) 312
Effective consolidated income taxes (195) (1,933) 521
Current 700 373 481
Deferred (895) (2,306) 40
Income tax expense (benefit) $ (195) $ (1,933) $ 521