Fair Value Measurements Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified					6 Months Ended
	Jan. 26, 2014	Jul. 28, 2013	Jan. 26, 2014 Fair Value, Inputs, Level 2 [Member]	Jul. 28, 2013 Fair Value, Inputs, Level 2 [Member]	Jan. 26, 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					$ 13	$ 11
Cash Equivalents, at Carrying Value	139	4
Cash Equivalents, Fair Value Disclosure			139	4
Long-term Debt	2,956	3,244
Long-term Debt, Fair Value			$ 2,972	$ 3,299