Segment Information - Narrative (Details) $ in Millions	12 Months Ended
	Jul. 31, 2021 USD ($) segment	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	4
Total segment operating income	$ 2,500	$ 2,176	$ 1,854
Net revenue:	9,633	7,679	6,784
QuickBooks Desktop Packaged Software Products
Segment Reporting Information [Line Items]
Net revenue:	$ 133	$ 147	$ 167
Maximum | International
Segment Reporting Information [Line Items]
International total net revenue, as a percentage of total	5.00%	5.00%	5.00%
Operating Segments
Segment Reporting Information [Line Items]
Total segment operating income	$ 5,381	$ 4,500	$ 3,872
Operating Segments | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total segment operating income	2,590	2,091	1,722
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Total segment operating income	2,237	2,063	1,820
Operating Segments | ProConnect
Segment Reporting Information [Line Items]
Total segment operating income	$ 372	346	330
Operating Segments | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total segment operating income		(180)	(172)
Operating Segments | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Total segment operating income		(121)	(78)
Operating Segments | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Total segment operating income		$ (13)	$ (12)