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Income Taxes - Additional Information (Detail) ₪ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2017 | Jul. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 ILS (₪) Employee | Dec. 31, 2019 USD ($) Employee | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of accrued potential penalties and interest in unrecognized tax benefits |  |  | $ 164 |  |  |  | $ 131 |  |  |  |  | $ 164 | $ 131 | $ 112 |
Unrecognized Tax Benefits Income Tax Penalties And Interest Expense |  |  |  |  |  |  |  |  |  |  |  | $ 33 | $ 19 | $ 29 |
Statutory tax rate in Israel |  |  |  |  |  |  |  |  |  |  | 23.00% | 23.00% | 23.00% | 24.00% |
Annual revenue |  |  | 4,468 | $ 4,093 | $ 4,177 | $ 4,149 | $ 4,419 | $ 4,385 | $ 4,552 | $ 4,916 |  | $ 16,887 | $ 18,271 | $ 21,853 |
Effective income tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 21.00% | 35.00% |
Tax benefit related to Tax Cuts And Jobs Act |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |
Provisional estimate for one-time deemed repatriation tax liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 97 | $ 112 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected impairment of income tax benefit |  | $ 146 |  |  |  |  |  |  |  |  |  |  |  |  |
Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax audit period |  |  |  |  |  |  |  |  |  |  | 2008 2009 2010 2011 | 2008 2009 2010 2011 |  |  |
Withholding tax percentage on dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00%
Israel Tax Authority [Member] | Tax Year 2005 To 2007 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax settlement amount |  |  |  |  |  |  |  |  |  |  |  | $ 213 |  |  |
Tax Carryforwards And Deductions Expiration Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect of unspecified carryforward losses and deductions |  |  | 61 |  |  |  |  |  |  |  |  | 61 |  |  |
Tax Carryforwards And Deductions Expiration Period Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect of unspecified carryforward losses and deductions |  |  | 672 |  |  |  |  |  |  |  |  | 672 |  |  |
Tax Carryforwards And Deductions No Expiration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect of unspecified carryforward losses and deductions |  |  | 193 |  |  |  |  |  |  |  |  | 193 |  |  |
Tax Carryforwards And Deductions Indefinite [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect of unspecified carryforward losses and deductions |  |  | 879 |  |  |  |  |  |  |  |  | 879 |  |  |
Amendment 69 to Investment Law [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of corporate tax |  |  |  |  |  |  |  |  |  |  |  | 577 |  |  |
Exempt Income |  |  |  |  |  |  |  |  |  |  |  | 9,400 |  |  |
Amendment 68 to Investment Law [Member] | Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate in Israel |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.00%
Amendment 68 to Investment Law [Member] | Israel Tax Authority [Member] | Development Zonea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate in Israel |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00%
Amendment 73 to Investment Law [Member] | Israel Tax Authority [Member] | Development Zonea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate in Israel | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Enterprise [Member] | Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax percentage on dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Preferred Enterprise [Member] | Israel Tax Authority [Member] | Development Zonea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax percentage on dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Preferred Technological Enterprises [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Venture capital investment |  |  | $ 2 |  |  |  |  |  |  |  |  | $ 2 |  |  |
Average growth rate in sales or workforce |  |  |  |  |  |  |  |  |  |  | 25.00% | 25.00% |  |  |
Average growth preceding period in sales or workforce |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |
Preferred Technological Enterprises [Member] | Research and Development Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of investment income |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  |  |
Minimum investment income |  |  |  |  |  |  |  |  |  |  | ₪ 75 | $ 22 |  |  |
Minimum percentage of workforce |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |
Minimum number of employees employed | Employee |  |  |  |  |  |  |  |  |  |  | 200 | 200 |  |  |
Preferred Technological Enterprises [Member] | Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate in Israel |  |  |  |  |  |  |  |  |  |  | 12.00% | 12.00% |  |  |
Preferred Technological Enterprises [Member] | Israel Tax Authority [Member] | Development Zonea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate in Israel |  |  |  |  |  |  |  |  |  |  | 7.50% | 7.50% |  |  |
Special Preferred Technological Enterprise [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual revenue |  |  |  |  |  |  |  |  |  |  | ₪ 10,000 | $ 2,900 |  |  |
Special Preferred Technological Enterprise [Member] | Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate in Israel |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% |  |  |
Withholding tax percentage on dividends |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00% |  |  |
Minimum [Member] | Tax Carryforwards And Deductions Expiration Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2020 | Dec. 31, 2020 |  |  |
Minimum [Member] | Tax Carryforwards And Deductions Expiration Period Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2023 | Dec. 31, 2023 |  |  |
Minimum [Member] | Tax Carryforwards And Deductions No Expiration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2030 | Dec. 31, 2030 |  |  |
Maximum [Member] | Tax Carryforwards And Deductions Expiration Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2022 | Dec. 31, 2022 |  |  |
Maximum [Member] | Tax Carryforwards And Deductions Expiration Period Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2029 | Dec. 31, 2029 |  |  |

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