Long-Term Obligations and Commitments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009	Mar. 12, 2007
Long Term Obligations And Commitments (Textuals)
Senior notes	$ 1,000	$ 1,000		$ 1,000
Interest paid	60	61	56
Cash paid to license technology	15	13	20
Unamortized discounts on senior notes	(1)	(2)
Payments to acquire intangible assets	15	13	20
Amount payable over next ten fiscal years for agreement to license technology			100
Present value of license technology agreement		89
Years lease term can be extended under lease option	7 years
Operating leases, rent expense	48	43	44
Reported as:
Current portion of long-term debt	500	0
Long-term debt	499	998
Total senior notes	999	998
Other long-term obligations
Total license fee payable	60	65
Total deferred rent	52	60
Long-term deferred revenue	40	29
Long-term income tax liabilities	42	20
Long-term payables	12	0
Other	1	3
Total long-term obligations	207	177
Less current portion (included in other current liabilities)	(17)	(19)
Long-term obligations due after one year	190	158
Operating Lease Expense [Member]
Fiscal year ending July 31,
Operating Leases, Future Minimum Payments Due, Current	52
Operating Leases, Future Minimum Payments, Due in Two Years	46
Operating Leases, Future Minimum Payments, Due in Three Years	45
Operating Leases, Future Minimum Payments, Due in Four Years	43
Operating Leases, Future Minimum Payments, Due in Five Years	43
Operating Leases, Future Minimum Payments, Due Thereafter	215
Operating Leases, Future Minimum Payments Due	444
Purchase Commitment [Member]
Fiscal year ending July 31,
Recorded Unconditional Purchase Obligation Due within One Year	78
Recorded Unconditional Purchase Obligation Due in Second Year	48
Recorded Unconditional Purchase Obligation Due in Third Year	44
Recorded Unconditional Purchase Obligation Due in Fourth Year	40
Recorded Unconditional Purchase Obligation Due in Fifth Year	40
Recorded Unconditional Purchase Obligation Due after Fifth Year	37
Recorded Unconditional Purchase Obligation	287
5.40% fixed-rate notes, due 2012 [Member]
Long Term Obligations And Commitments (Textuals)
Senior notes		500		500
Senior notes, rate				5.40%
5.75% fixed-rate notes, due 2017 [Member]
Long Term Obligations And Commitments (Textuals)
Senior notes		500		500
Senior notes, rate				5.75%
Senior Notes [Member]
Long Term Obligations And Commitments (Textuals)
Interest paid	$ 56	$ 56	$ 56