Segment Information - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2021 USD ($) segment	Apr. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Total operating income	$ 1,914	$ 1,413	$ 2,098	$ 1,693
International total net revenue as a percentage of total (less than)	5.00%		5.00%
Segment Reconciling Items
Segment Reporting Information [Line Items]
Other corporate expenses	$ (506)	(438)	$ (1,380)	(1,304)
Segment Reconciling Items | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Other corporate expenses		(43)		(131)
Segment Reconciling Items | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Other corporate expenses		(29)		(82)
Segment Reconciling Items | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Other corporate expenses		(3)		(10)
Operating Segments
Segment Reporting Information [Line Items]
Total operating income	2,706	1,961	4,114	3,340
Operating Segments | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total operating income	620	456	1,979	1,496
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Total operating income	1,773	1,350	1,622	1,521
Operating Segments | ProConnect
Segment Reporting Information [Line Items]
Total operating income	$ 196	155	$ 358	323
Operating Segments | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total operating income		(43)		(131)
Operating Segments | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Total operating income		(29)		(82)
Operating Segments | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Total operating income		$ (3)		$ (10)