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Income Taxes - Additional Information (Detail) ₪ in Millions, $ in Millions		3 Months Ended								12 Months Ended
	Jan. 01, 2017	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) yr Employee	Dec. 31, 2018 ILS (₪) yr Employee	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Tax [Line Items]
Balance of accrued potential penalties and interest in unrecognized tax benefits		$ 131				$ 112				$ 131		$ 112	$ 83
Unrecognized Tax Benefits Income Tax Penalties And Interest Expense										$ 19		$ 29	$ 18
Statutory tax rate in Israel										23.00%	23.00%	24.00%	25.00%
Annual revenue		4,559	$ 4,529	$ 4,701	$ 5,065	$ 5,398	$ 5,617	$ 5,720	$ 5,650	$ 18,854		$ 22,385	$ 21,903
Effective income tax rate										21.00%	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
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		206								206
Tax Carryforwards And Deductions Expiration Period Two [Member]
Income Tax [Line Items]
Tax effect of unspecified carryforward losses and deductions		448								448
Tax Carryforwards And Deductions No Expiration [Member]
Income Tax [Line Items]
Tax effect of unspecified carryforward losses and deductions		280								280
Tax Carryforwards And Deductions Indefinite [Member]
Income Tax [Line Items]
Tax effect of unspecified carryforward losses and deductions		441								441
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]
Income Tax [Line Items]
Statutory tax rate in Israel												6.00%
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 \| yr										3	3
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	$ 19
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										$ 2,800	₪ 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										Jan. 01, 2019	Jan. 01, 2019
Minimum [Member] \| Tax Carryforwards And Deductions Expiration Period Two [Member]
Income Tax [Line Items]
Expiration period										Jan. 01, 2022	Jan. 01, 2022
Minimum [Member] \| Tax Carryforwards And Deductions No Expiration [Member]
Income Tax [Line Items]
Expiration period										Jan. 01, 2029	Jan. 01, 2029
Maximum [Member] \| Tax Carryforwards And Deductions Expiration Period One [Member]
Income Tax [Line Items]
Expiration period										Dec. 31, 2021	Dec. 31, 2021
Maximum [Member] \| Tax Carryforwards And Deductions Expiration Period Two [Member]
Income Tax [Line Items]
Expiration period										Dec. 31, 2028	Dec. 31, 2028