Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Schedule of amounts reclassified from AOCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2013		Jul. 29, 2012		Jul. 31, 2011
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax	$ 4		$ 0		$ 9
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Reclassification of prior service credit included in net earnings, before tax	(2)	[1]	(1)	[1]	0
Reclassification of net actuarial loss included in net earnings before tax	124	[1]	83	[1]	77	[1]
Total Pension and Other Postretirement Benefit amortization included in net earnings, before Tax	122		82		77
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, tax expense (benefit)	(1)		0		(3)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Total Pension and Other Postretirement Benefit amortization included in net earnings, tax expense (benefit)	(54)		(29)		(30)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, after-tax	3		0		6
Pension and other postretirement liability adjustments, after-tax [Abstract]
Total Pension and Other Postretirement Benefit amortization included in net earnings, net of tax	68		53		47
Foreign Exchange Contract [Member] | Cost Of Products Sold [Member]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax	1		(1)		4
Foreign Exchange Contract [Member] | Other Expense [Member]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax	(1)		(2)		2
Interest Rate Swap [Member] | Interest Expense [Member]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax	$ 4		$ 3		$ 3

[1] These items are included in the components of net periodic benefit costs. See Note 11 for additional details.