Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Schecule of amounts reclassified from AOCI) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		May. 01, 2016	May. 03, 2015	May. 01, 2016	May. 03, 2015
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax		$ (3)	$ (1)	$ (9)	$ 0
Reclassification adjustment for (gains) losses included in net earnings, tax expense (benefit)		1	0	3	0
Reclassification adjustment for (gains) losses included in net earnings, after-tax		(2)	(1)	(6)	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	[1]	(1)	(1)	(2)	(2)
Other Comprehensive Income (Loss), Tax [Abstract]
Tax expense (benefit)		0	0	0	0
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total pension and other postretirement benefit amortization included in net earnings, net of tax		(1)	(1)	(2)	(2)
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)	(2)	(10)	(2)
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		0	0	(2)	(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		$ 1	$ 1	$ 3	$ 3

[1] This is included in the components of net periodic benefit costs (see Note 9 for additional details).