Restructuring Charges (Schedule Of Restructuring Activity And Related Reserves) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 27, 2013
2013 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	$ 3
2013 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	17
Restructuring and Related Cost, Incurred Cost	1
Cash Payments	(6)
Accrued Balance at end of period	12
2013 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	2
2011 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	4
Cash Payments	0
Accrued Balance at end of period	4
2011 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	3
Cash Payments	0
Accrued Balance at end of period	3
2011 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	1
Cash Payments
Accrued Balance at end of period	$ 1