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Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2020
Segment Reporting Information [Line Items]
Total operating income (loss)	$ (25)	$ 270	$ 184	$ 280
Revenue recognized	144	154	$ 543	509
Description of timing			12 months
Long-term deferred revenue	7		$ 7		$ 13
Notes receivable	62		62		$ 40
Segment Reconciling Items
Segment Reporting Information [Line Items]
Other Expenses	442	440	874	866
Segment Reconciling Items | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Other Expenses		45		88
Segment Reconciling Items | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Other Expenses		28		53
Segment Reconciling Items | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Other Expenses		4		7
Operating Segments
Segment Reporting Information [Line Items]
Total operating income (loss)	647	824	1,408	1,379
Operating Segments | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total operating income (loss)	592	447	1,359	1,040
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Total operating income (loss)	(155)	191	(151)	171
Operating Segments | ProConnect
Segment Reporting Information [Line Items]
Total operating income (loss)	$ 172	186	$ 162	168
Operating Segments | Segment Reclass | Small Business & Self-Employed
Segment Reporting Information [Line Items]
Total operating income (loss)		45		88
Operating Segments | Segment Reclass | Consumer
Segment Reporting Information [Line Items]
Total operating income (loss)		28		53
Operating Segments | Segment Reclass | ProConnect
Segment Reporting Information [Line Items]
Total operating income (loss)		$ 4		$ 7

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