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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.

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