Discontinued Operations Net Income (loss) from Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2013	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue from discontinued operations		$ 137	$ 236	$ 263
Income (loss) from discontinued operations before income taxes		(2)	(188)	12
Net income (loss) from discontinued operations		173	(48)	54
Intuit Financial Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue from discontinued operations		0	0	0
Income (loss) from discontinued operations before income taxes		0	0	0
Net income (loss) from discontinued operations		0	0	0
Net gain (loss) on disposal of business	$ 36	0	0	36
Intuit Health
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue from discontinued operations		0	0	1
Income (loss) from discontinued operations before income taxes		0	0	(1)
Net income (loss) from discontinued operations		0	0	0
Net gain (loss) on disposal of business	$ 10	0	0	10
Demandforce
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue from discontinued operations		49	115	107
Income (loss) from discontinued operations before income taxes		(10)	(63)	(51)
Net income (loss) from discontinued operations		(6)	(39)	(30)
QuickBase
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue from discontinued operations		54	70	57
Income (loss) from discontinued operations before income taxes		10	11	7
Net income (loss) from discontinued operations		6	7	4
Quicken
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue from discontinued operations		34	51	98
Income (loss) from discontinued operations before income taxes		(2)	(136)	57
Net income (loss) from discontinued operations		0	(140)	34
Demandforce, QuickBase, and Quicken
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain (loss) on disposal of business		$ (173)	$ (124)	$ 0