Restructuring Charges and Cost Savings Initiatives (Schedule Of Pre-Tax Charges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	May. 01, 2016	May. 03, 2015	May. 01, 2016	May. 03, 2015	Aug. 02, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 2	$ 9	$ 32	$ 9
2015 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	194		194
Restructuring and Related Cost, Incurred Cost	2		35	$ 9	$ 102
2015 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	128		128
2015 Initiatives [Member] | Implementation and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	66		66
2014 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	51		51		54	[1]
Restructuring and Related Cost, Incurred Cost			(3)
2014 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	38		38		41	[1]
Restructuring and Related Cost, Incurred Cost			(3)
2014 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	12		12		12	[1]
Restructuring and Related Cost, Incurred Cost			0
2014 Initiatives [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 1		1		$ 1	[1]
Restructuring and Related Cost, Incurred Cost			$ 0

[1] Recognized as of August 2, 2015.