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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 ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) Employee	Dec. 31, 2020 ILS (₪) Employee	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016
Income Tax [Line Items]
Balance of accrued potential penalties and interest in unrecognized tax benefits			$ 173				$ 164				$ 173		$ 164	$ 131
Unrecognized Tax Benefits Income Tax Penalties And Interest Expense											$ 9		$ 33	$ 19
Statutory tax rate in Israel											23.00%	23.00%	23.00%	23.00%
Annual revenue			4,454	$ 3,978	$ 3,870	$ 4,357	$ 4,468	$ 4,093	$ 4,177	$ 4,149	$ 16,659		$ 16,887	$ 18,271
Effective income tax rate														21.00%	35.00%
Expected impairment of income tax benefit		$ 141
Provisional estimate for one-time deemed repatriation tax liability														$ 97	$ 112
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			79								$ 79
Tax Carryforwards And Deductions Expiration Period Two [Member]
Income Tax [Line Items]
Tax effect of unspecified carryforward losses and deductions			663								663
Tax Carryforwards And Deductions No Expiration [Member]
Income Tax [Line Items]
Tax effect of unspecified carryforward losses and deductions			171								171
Tax Carryforwards And Deductions Indefinite [Member]
Income Tax [Line Items]
Tax effect of unspecified carryforward losses and deductions			1,327								1,327
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											$ 22	₪ 75
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											$ 2,900	₪ 10,000
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, 2021	Dec. 31, 2021
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