Business Combinations - Schedule of Preliminary Allocation of Purchase Price (Details) - USD ($) $ in Millions	Jul. 31, 2021	Dec. 03, 2020	Jul. 31, 2020	Jul. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 5,613		$ 1,654	$ 1,655
Credit Karma
Business Acquisition [Line Items]
Cash and cash equivalents		$ 436
Accounts receivable, net		141
Income taxes receivable		59
Prepaid expenses and other current assets		7
Long-term investments		3
Property and equipment, net		63
Operating lease right-of-use assets		167
Goodwill		3,898
Intangible assets		3,372
Other assets		81
Accounts payable		(86)
Accrued compensation and related liabilities		(113)
Other current liabilities		(24)
Operating lease liabilities		(172)
Long-term deferred income tax liabilities		(627)
Other long-term obligations		(10)
Total preliminary purchase price allocation		$ 7,195