Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Schecule of amounts reclassified from AOCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 03, 2014		Jul. 28, 2013		Jul. 29, 2012
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax	$ 0		$ 4		$ 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	(2)	[1]	(2)	[1]	(1)	[1]
Reclassification of net actuarial loss included in net earnings before tax	113	[1]	124	[1]	83	[1]
Total Pension and Other Postretirement Benefit amortization included in net earnings, before Tax	111		122		82
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, tax expense (benefit)	0		(1)		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)	(39)		(54)		(29)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, after-tax	0		3		0
Pension and other postretirement liability adjustments, after-tax [Abstract]
Total Pension and Other Postretirement Benefit amortization included in net earnings, net of tax	72		68		53
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	(4)		1		(1)
Foreign Exchange Contract [Member] | Other Expenses/Income [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)		(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
Discontinued Operations [Member]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Reclassification of net actuarial loss included in net earnings before tax	$ 2	[1]

[1] In 2014, net actuarial losses of $2 were recognized in Earnings (loss) from discontinued operations as a result of the sale of the European simple meals business. Excluding the net actuarial losses related to the sale of the business in 2014, these items are included in the components of net periodic benefit costs (see Note 11 for additional details).