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Income Taxes - Schedule of Income Before 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]      
Parent Company and its Israeli subsidiaries $ 1,022 $ 1,451 $ 1,516
Non-Israeli subsidiaries (3,618) (19,830) (692)
Income (loss) before income taxes $ (2,596) $ (18,379) $ 824