Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023	Jul. 31, 2023
Segment Reporting Information [Line Items]
Revenue recognized	$ 167	$ 158	$ 805	$ 693
Deferred revenue	3		$ 3		$ 5
Description of timing			12 months
Segment Reconciling Items
Segment Reporting Information [Line Items]
Other corporate expenses	$ 768	719	$ 1,487	1,401
Segment Reconciling Items | Reorganization of Certain Workplace and Real Estate Functions
Segment Reporting Information [Line Items]
Other corporate expenses		10		19
Segment Reconciling Items | Reorganization of Certain Technology Functions
Segment Reporting Information [Line Items]
Other corporate expenses		43		83
Segment Reconciling Items | Reorganization of Certain Technology Functions
Segment Reporting Information [Line Items]
Other corporate expenses		16		31
Small Business & Self-Employed | Operating Segments | Reorganization of Certain Workplace and Real Estate Functions
Segment Reporting Information [Line Items]
Other corporate expenses		10		19
Consumer | Operating Segments | Reorganization of Certain Technology Functions
Segment Reporting Information [Line Items]
Other corporate expenses		43		83
ProTax | Operating Segments | Reorganization of Certain Technology Functions
Segment Reporting Information [Line Items]
Other corporate expenses		$ 16		$ 31