Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Jul. 31, 2020
Segment Reporting Information [Line Items]
Total operating income	$ 1,914	$ 1,413	$ 2,098	$ 1,693
Revenue recognized	83	89	$ 626	598
Description of timing			12 months
Long-term deferred revenue	7		$ 7		$ 13
Notes receivable	93		93		$ 40
Segment Reconciling Items
Segment Reporting Information [Line Items]
Other Expenses	506	438	1,380	1,304
Segment Reconciling Items | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Other Expenses		43		131
Segment Reconciling Items | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Other Expenses		29		82
Segment Reconciling Items | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Other 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)