Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Revenue from External Customer [Line Items]
Net revenue:	$ 2,007	$ 1,323
Small Business & Self-Employed
Revenue from External Customer [Line Items]
Net revenue:	1,443	1,181
Consumer
Revenue from External Customer [Line Items]
Net revenue:	120	119
ProConnect
Revenue from External Customer [Line Items]
Net revenue:	26	23
Credit Karma
Revenue from External Customer [Line Items]
Net revenue:	418	0
Online Ecosystem Subsegment | Small Business & Self-Employed
Revenue from External Customer [Line Items]
Net revenue:	845	621
Online Ecosystem Subsegment | Small Business & Self-Employed | QuickBooks
Revenue from External Customer [Line Items]
Net revenue:	519	392
Online Ecosystem Subsegment | Small Business & Self-Employed | Online Services
Revenue from External Customer [Line Items]
Net revenue:	326	229
Desktop Ecosystem Subsegment | Small Business & Self-Employed
Revenue from External Customer [Line Items]
Net revenue:	598	560
Desktop Ecosystem Subsegment | Small Business & Self-Employed | QuickBooks
Revenue from External Customer [Line Items]
Net revenue:	267	241
Desktop Ecosystem Subsegment | Small Business & Self-Employed | Desktop Services and Supplies
Revenue from External Customer [Line Items]
Net revenue:	$ 331	$ 319