Current Liabilities Other current liabilities (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Jul. 31, 2013
Other Liabilities, Current [Abstract]
Reserve for product returns	$ 71	$ 20
Reserve for rebates	62	15
Current portion of license fee payable	10	10
Current portion of deferred rent	7	8
Interest payable	10	10
Executive deferred compensation plan liabilities	68	64
Other	32	29
Total other current liabilities	$ 260	$ 156