Segment Information - Narrative (Details) $ in Millions	3 Months Ended
	Oct. 31, 2020 USD ($) segment	Oct. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Total operating income	$ 209	$ 10
International total net revenue as a percentage of total (less than)	6.00%	6.00%
Segment Reconciling Items
Segment Reporting Information [Line Items]
Other common expenses	$ (432)	$ (426)
Segment Reconciling Items | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Other common expenses		43
Segment Reconciling Items | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Other common expenses		25
Segment Reconciling Items | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Other common 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