Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Operating Loss Carryforwards [Line Items]
Excess tax benefits related to stock-based compensation		$ 90	$ 120	$ 100
Federal statutory income tax rate		21.00%	21.00%	26.90%
Provisional benefit related to re-measurement of certain deferred tax balances				$ 29
Capital loss on subsidiary reorganization	$ 35	$ 0	$ 0	35
Total net deferred tax assets, net of valuation allowance		264	129
Valuation allowance		132	107
Unrecognized tax benefits net of related deferred tax assets		61
Favorable net impact to income tax expense due to recognition of tax benefits		61
Long term income tax receivable		59
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Excess tax benefits related to stock-based compensation		11	$ 14	$ 6
Operating loss carryforwards		83
Total net deferred tax assets, net of valuation allowance		6
Valuation allowance		4
Domestic Country
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		34
Foreign Tax Authority | Inland Revenue, Singapore (IRAS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		61
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		51
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		57
Research Tax Credit Carryforward | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax assets, tax credit carryforwards		$ 110