Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Operating Loss Carryforwards [Line Items]
Excess tax benefits for provision for income taxes	$ 72
Reduction of income taxes payable		$ 59	$ 85
Discrete tax benefit due to changes in tax law		12	$ 11
Total net deferred tax assets, net of valuation allowance	275	242
Valuation Allowance	64	40
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Excess tax benefits for provision for income taxes	3
Operating loss carryforwards	103
Total net deferred tax assets, net of valuation allowance	6
Valuation Allowance	5
Domestic Country
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	16
Foreign Tax Authority | Inland Revenue, Singapore (IRAS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	92
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	14
Capital Loss Carryforward | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, valuation allowance		2
Research Tax Credit Carryforward | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax assets, tax credit carryforwards	$ 66
Demandforce, QuickBase, and Quicken
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit) from discontinued operations		$ 179