Stockholders' Equity - Restricted stock unit activity and related share-based compensation expense (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Nov. 01, 2021	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Number of Shares
Nonvested, number of shares, beginning balance (in shares)		11,467,000	9,038,000	5,664,000
Assumed through acquisition (in shares)				1,998,000
Granted (in shares)		5,260,000	6,634,000	3,877,000
Restricted stock subject to revest provisions issued in connection with acquisition (in shares)				775,000
Vested (in shares)		(4,019,000)	(3,154,000)	(2,242,000)
Forfeited (in shares)		(814,000)	(1,051,000)	(1,034,000)
Nonvested, number of shares, ending balance (in shares)		11,894,000	11,467,000	9,038,000
Weighted Average Grant Date Fair Value
Nonvested, weighted average grant date fair value per share, beginning balance (in dollars per share)		$ 413.32	$ 345.86	$ 231.97
Assumed through acquisition (in dollars per share)				355.49
Granted (in dollars per share)		452.45	466.12	431.82
Restricted stock subject to revest provisions issued in connection with acquisition (in dollars per share)				355.49
Vested (in dollars per share)		414.12	351.80	262.23
Forfeited (in dollars per share)		364.45	351.15	251.41
Nonvested, weighted average grant date fair value per share, ending balance (in dollars per share)		$ 433.70	$ 413.32	$ 345.86
Total tax benefit related to RSU share-based compensation expense		$ 373	$ 396	$ 269
The Rocket Science Group, LLC (Mailchimp)
Weighted Average Grant Date Fair Value
Fair value of equity awards	$ 6,300
Business acquisition, equity interest issued (in shares)	10,100,000
Restricted Stock Units (RSUs)
Weighted Average Grant Date Fair Value
Total fair market value of shares vested		1,673	1,658	942
Share-based compensation for RSUs		1,636	1,248	708
Total tax benefit related to RSU share-based compensation expense		339	375	225
Cash tax benefits realized for tax deductions for RSUs		$ 347	$ 334	$ 221
Restricted Stock Units (RSUs) | Credit Karma
Number of Shares
Granted (in shares)				809,000
Weighted Average Grant Date Fair Value
Fair value of equity awards				$ 300
Restricted Stock Units (RSUs) | The Rocket Science Group, LLC (Mailchimp)
Weighted Average Grant Date Fair Value
Fair value of equity awards	$ 211
Stock units issued in substitution of outstanding equity incentive awards	583,000
Grant date fair value of equity awards	$ 355
Business acquisition, equity interest issued (in shares)	325,000