Fair Value Measurements Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended	3 Months Ended
	Apr. 27, 2014	Jul. 28, 2013	Apr. 27, 2014 Fair Value, Inputs, Level 2 [Member]	Jul. 28, 2013 Fair Value, Inputs, Level 2 [Member]	Apr. 27, 2014 2014 Initiatives [Member] CHINA	Jan. 26, 2014 2014 Initiatives [Member] Asset Impairment Accelerated Depreciation [Member] CHINA Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Incurred Cost					$ 14	$ 11
Cash Equivalents, at Carrying Value	40	4
Cash Equivalents, Fair Value Disclosure			40	4
Long-term Debt	2,947	3,244
Long-term Debt, Fair Value			$ 3,025	$ 3,299