Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Schecule of amounts reclassified from AOCI) (Details) - USD ($) $ in Millions		12 Months Ended
		Aug. 02, 2015	Aug. 03, 2014	Jul. 28, 2013
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax		$ (1)	$ 0	$ 4
Reclassification adjustment for (gains) losses included in net earnings, tax expense (benefit)		1	0	(1)
Reclassification adjustment for (gains) losses included in net earnings, after-tax		0	0	3
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	[1]	(2)	(2)	(2)
Reclassification of net actuarial loss included in net earnings before tax	[1]	98	113	124
Total Pension and Other Postretirement Benefit amortization included in net earnings, before Tax		96	111	122
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)		(35)	(39)	(54)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Total Pension and Other Postretirement Benefit amortization included in net earnings, net of tax		61	72	68
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)	(4)	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	(1)
Interest Rate Contract [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	$ 4
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	[1]	$ 2

[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).