Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Revenue from External Customer [Line Items]
Net revenue:	$ 4,173	$ 3,002	$ 7,072	$ 5,863
Small Business & Self-Employed
Revenue from External Customer [Line Items]
Net revenue:	1,177	982	3,436	3,001
Consumer
Revenue from External Customer [Line Items]
Net revenue:	2,445	1,827	2,711	2,426
ProConnect
Revenue from External Customer [Line Items]
Net revenue:	235	193	465	436
Credit Karma
Revenue from External Customer [Line Items]
Net revenue:	316	0	460	0
Online Ecosystem Subsegment | Small Business & Self-Employed
Revenue from External Customer [Line Items]
Net revenue:	715	560	1,980	1,591
Online Ecosystem Subsegment | Small Business & Self-Employed | QuickBooks
Revenue from External Customer [Line Items]
Net revenue:	437	353	1,233	989
Online Ecosystem Subsegment | Small Business & Self-Employed | Online Services
Revenue from External Customer [Line Items]
Net revenue:	278	207	747	602
Desktop Ecosystem Subsegment | Small Business & Self-Employed
Revenue from External Customer [Line Items]
Net revenue:	462	422	1,456	1,410
Desktop Ecosystem Subsegment | Small Business & Self-Employed | QuickBooks
Revenue from External Customer [Line Items]
Net revenue:	193	173	594	577
Desktop Ecosystem Subsegment | Small Business & Self-Employed | Desktop Services and Supplies
Revenue from External Customer [Line Items]
Net revenue:	269	249	862	833
Desktop Ecosystem Subsegment | Small Business & Self-Employed | QuickBooks Packaged Software
Revenue from External Customer [Line Items]
Net revenue:	$ 43	$ 36	$ 89	$ 97