Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020
Segment Reporting Information [Line Items]
Total operating income	$ 209	$ 10
Revenue recognized	$ 399	355
Description of timing	12 months
Long-term deferred revenue	$ 9		$ 13
Notes receivable	26		$ 40
Segment Reconciling Items
Segment Reporting Information [Line Items]
Other Expenses	432	426
Segment Reconciling Items | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Other Expenses		(43)
Segment Reconciling Items | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Other Expenses		(25)
Segment Reconciling Items | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Other Expenses		(3)
Operating Segments
Segment Reporting Information [Line Items]
Total operating income	761	555
Operating Segments | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total operating income	767	593
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Total operating income	4	(20)
Operating Segments | ProConnect
Segment Reporting Information [Line Items]
Total operating income	$ (10)	(18)
Operating Segments | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total operating income		43
Operating Segments | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Total operating income		25
Operating Segments | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Total operating income		$ 3