Fair Value Measurements Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						12 Months Ended
	Jul. 28, 2013	Jul. 29, 2012	Jul. 31, 2011	Jul. 28, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Apr. 28, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Jul. 29, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Jul. 28, 2013 2013 Initiatives [Member]	Jul. 28, 2013 2013 Initiatives [Member] Asset Impairment Accelerated Depreciation [Member]	Jul. 28, 2013 Segment, Discontinued Operations [Member]	Jul. 28, 2013 Segment, Discontinued Operations [Member] Trademarks Bla Band [Member]	Jul. 29, 2012 Segment, Discontinued Operations [Member] Trademarks Bla Band [Member] Fair Value, Measurements, Nonrecurring [Member]	Jul. 28, 2013 Segment, Discontinued Operations [Member] Trademarks Bla Band [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Jul. 29, 2012 Segment, Discontinued Operations [Member] Trademarks Bla Band [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Incurred Cost							$ 142	$ 99
Goodwill, Impairment Loss	(360)								(360)
Disposal Group, Including Discontinued Operation, Goodwill	110
Assets, Fair Value Disclosure												19	20
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	36	3	3						36	1	3
Cash and Cash Equivalents, Fair Value Disclosure					4	80
Cash Equivalents, at Carrying Value	4	80
Long-term Debt	3,244	2,408
Long-term Debt, Fair Value				$ 3,299		$ 2,663