Supplemental Financial Statement Data Supplemental Financial Statement Data (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2013	Jul. 29, 2012	Jul. 31, 2011
Depreciation	$ 393	$ 258	$ 265
Minimum [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	7 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	45 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	20 years
Segment, Continuing Operations [Member]
Depreciation	$ 382	$ 247	$ 253