Description of Business and Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Apr. 30, 2015 Business_unit	Apr. 30, 2014	Apr. 30, 2015 Business_unit	Apr. 30, 2014	Jul. 31, 2014 customers
Accounting Policies [Abstract]
Number of businesses discontinued	2intu_NumberofDiscontinuedBusinesses		2intu_NumberofDiscontinuedBusinesses
Numerator:
Net income from continuing operations	$ 501	$ 984	$ 351	$ 890
Net income from discontinued operations	0	0	0	46
Net income	$ 501us-gaap_NetIncomeLoss	$ 984us-gaap_NetIncomeLoss	$ 351us-gaap_NetIncomeLoss	$ 936us-gaap_NetIncomeLoss
Shares used in basic per share amounts:
Weighted average common shares outstanding (in shares)	277	284	282	285
Shares used in diluted per share amounts:
Weighted average common shares outstanding (in shares)	277	284	282	285
Dilutive common equivalent shares from stock options and restricted stock awards (in shares)	5	6	6	6
Dilutive weighted average common shares outstanding (in shares)	282	290	288	291
Basic and diluted net income per share:
Basic net income per share from continuing operations (in dollars per share)	$ 1.81	$ 3.47	$ 1.24	$ 3.12
Basic net income per share from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.16
Basic net income per share (in dollars per share)	$ 1.81us-gaap_EarningsPerShareBasic	$ 3.47us-gaap_EarningsPerShareBasic	$ 1.24us-gaap_EarningsPerShareBasic	$ 3.28us-gaap_EarningsPerShareBasic
Diluted net income per share from continuing operations (in dollars per share)	$ 1.78	$ 3.39	$ 1.22	$ 3.06
Diluted net income per share from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.16
Diluted net income per share (in dollars per share)	$ 1.78us-gaap_EarningsPerShareDiluted	$ 3.39us-gaap_EarningsPerShareDiluted	$ 1.22us-gaap_EarningsPerShareDiluted	$ 3.22us-gaap_EarningsPerShareDiluted
Shares excluded from computation of diluted net income per share:
Weighted average stock options and restricted stock units excluded from computation due to anti-dilutive effect (in shares)	0	0	2	3
Customer Concentration Risk [Member] \| Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Number of Customers	0	0	0	0
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Number of Customers			0		0

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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