Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Number of significant transfers between levels one two and three	$ 0	$ 0	$ 0
Goodwill and intangible asset impairment	0	30	0
Goodwill, impairment loss	0	24	0
Impairment of intangible assets (excluding goodwill)	0		0
Other than Temporary Impairment Losses, Investments	0	0	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying value of Intuit Health reporting unit		75
Goodwill and intangible asset impairment		30
Goodwill, impairment loss		24
Impairment of intangible assets (excluding goodwill)		$ 6