Description of Business and Summary of Significant Accounting Policies - Additional information (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Property, Plant and Equipment [Line Items]
Operating income reclassified	$ (2,500,000,000)	$ (2,176,000,000)	$ (1,854,000,000)
Deferred revenue, revenue recognized	$ 652,000,000	619,000,000
Revenue, performance obligation, description of timing	12 months
Long-term deferred revenue	$ 8,000,000	13,000,000
Advertising expense	1,100,000,000	778,000,000	800,000,000
Notes receivable	$ 139,000,000	$ 40,000,000
Business combination measurement period	1 year
Acquired intangible assets, useful life	14 years	4 years
Goodwill, impairment loss	$ 0	$ 0	0
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Acquired intangible assets, useful life	2 years
Capitalized contract cost, amortization period	3 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	30 years
Acquired intangible assets, useful life	15 years
Capitalized contract cost, amortization period	4 years
Operating Segments
Property, Plant and Equipment [Line Items]
Operating income reclassified	$ (5,381,000,000)	(4,500,000,000)	(3,872,000,000)
Small Business & Self-Employed | Operating Segments
Property, Plant and Equipment [Line Items]
Operating income reclassified	(2,590,000,000)	(2,091,000,000)	(1,722,000,000)
Consumer | Operating Segments
Property, Plant and Equipment [Line Items]
Operating income reclassified	(2,237,000,000)	(2,063,000,000)	(1,820,000,000)
ProConnect | Operating Segments
Property, Plant and Equipment [Line Items]
Operating income reclassified	$ (372,000,000)	(346,000,000)	(330,000,000)
Segment Reclass | Small Business & Self-Employed | Operating Segments
Property, Plant and Equipment [Line Items]
Operating income reclassified		180,000,000	172,000,000
Segment Reclass | Consumer | Operating Segments
Property, Plant and Equipment [Line Items]
Operating income reclassified		121,000,000	78,000,000
Segment Reclass | ProConnect | Operating Segments
Property, Plant and Equipment [Line Items]
Operating income reclassified		$ 13,000,000	$ 12,000,000
Software Development | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Software Development | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	6 years