Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Schecule of amounts reclassified from AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 27, 2013		Oct. 28, 2012
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax	$ 0		$ 0
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	0	[1]	0	[1]
Reclassification of net actuarial loss included in net earnings before tax	22	[1]	30	[1]
Total Pension and Other Postretirement Benefit amortization included in net earnings, before Tax	22		30
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, tax (expense) benefit	0		0
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)	(8)		(11)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, after-tax	0		0
Pension and other postretirement liability adjustments, after-tax [Abstract]
Total Pension and Other Postretirement Benefit amortization included in net earnings, net of tax	14		19
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)
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	$ 1		$ 1

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