Fair Value Measurements Fair Value Measurements (Fair Value, Assets and Liabilities Measured on Nonrecurring Basis (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 29, 2012	Jul. 31, 2011
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 3	$ 3
Fair Value, Measurements, Nonrecurring [Member] | Trademarks [Member]
Assets, Fair Value Disclosure	$ 20	$ 11