Long-Term Obligations (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Jul. 31, 2011	Mar. 12, 2007
Long Term Obligations (Textuals)
Senior notes				$ 1,000
Cash paid for interest on the Notes	56	56
Other long-term obligations
Total license fee payable	63		60
Total deferred rent	53		52
Long-term deferred revenue	42		40
Long-term income tax liabilities	43		42
Long-term payables	8		12
Other	4		1
Total long-term obligations	213		207
Less current portion (included in other current liabilities)	(18)		(17)
Long-term obligations due after one year	195		190
5.75 percent fixed-rate notes due 2017 [Member]
Long Term Obligations (Textuals)
Senior notes				500
Senior notes, rate				5.75%
5.40 percent fixed-rate notes due 2012 [Member]
Long Term Obligations (Textuals)
Senior notes				$ 500
Senior notes, rate				5.40%