Segment Information - Results by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Financial results by reportable segment
Net revenue:	$ 4,173	$ 3,002	$ 7,072	$ 5,863
Total operating income	1,914	1,413	2,098	1,693
Unallocated corporate items:
Share-based compensation expense	(218)	(103)	(509)	(321)
Amortization of acquired technology	(14)	(5)	(35)	(17)
Amortization of other acquired intangible assets	(54)	(2)	(92)	(5)
Operating Segments
Financial results by reportable segment
Total operating income	2,706	1,961	4,114	3,340
Segment Reconciling Items
Unallocated corporate items:
Share-based compensation expense	(218)	(103)	(509)	(321)
Other corporate expenses	(506)	(438)	(1,380)	(1,304)
Amortization of acquired technology	(14)	(5)	(35)	(17)
Amortization of other acquired intangible assets	(54)	(2)	(92)	(5)
Total unallocated corporate items	(792)	(548)	(2,016)	(1,647)
Small Business & Self-Employed
Financial results by reportable segment
Net revenue:	1,177	982	3,436	3,001
Small Business & Self-Employed | Operating Segments
Financial results by reportable segment
Total operating income	620	456	1,979	1,496
Consumer
Financial results by reportable segment
Net revenue:	2,445	1,827	2,711	2,426
Consumer | Operating Segments
Financial results by reportable segment
Total operating income	1,773	1,350	1,622	1,521
ProConnect
Financial results by reportable segment
Net revenue:	235	193	465	436
ProConnect | Operating Segments
Financial results by reportable segment
Total operating income	196	155	358	323
Credit Karma
Financial results by reportable segment
Net revenue:	316	0	460	0
Credit Karma | Operating Segments
Financial results by reportable segment
Total operating income	$ 117	$ 0	$ 155	$ 0