Restructuring Charges (Schedule Of Restructuring Activity And Related Reserves) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 03, 2014		Jul. 28, 2013		Jul. 29, 2012	Jul. 31, 2011
2014 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	$ (54)
2014 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	0
Restructuring and Related Cost, Incurred Cost	41
Cash Payments	(13)
Restructuring Reserve, Translation Adjustment	0
Accrued Balance at end of period	28
2014 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	(12)
2014 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	(1)	[1]
2013 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	(4)		(142)
2013 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	17		0
Restructuring and Related Cost, Incurred Cost	0		32
Cash Payments	(14)		(15)
Accrued Balance at end of period	3		17
2013 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	0		(99)
2013 Initiatives [Member] | Pension Plan, Defined Benefit [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	0	[2]	(3)	[2]
2013 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	(4)	[3]	(8)	[3]
2011 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	3		14		35	0
Restructuring and Related Cost, Incurred Cost					4	37
Cash Payments	(3)		(10)		(24)	(2)
Restructuring Reserve, Translation Adjustment			(1)		(1)
Accrued Balance at end of period	0		3		14	35
2011 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost					(1)	(22)
2011 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	1		2		4	0
Restructuring and Related Cost, Incurred Cost					2	4
Cash Payments	(1)		(1)		(4)	0
Restructuring Reserve, Translation Adjustment			0		0
Accrued Balance at end of period	0		1		2	4
2011 Initiatives [Member] | Other Non-cash Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost					$ (3)	$ 0

[1] Includes non-cash costs that are not reflected in the restructuring reserve in the Consolidated Balance Sheet.

[2] Represents pension curtailment costs. See Note 11.

[3] Includes non-cash costs and other exit costs recognized as incurred that are not reflected in the restructuring reserve in the Consolidated Balance Sheet.