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Restructuring Charges and Cost Savings Initiatives (Schedule Of Pre-Tax Charges) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 29, 2017
Oct. 30, 2016
Jul. 30, 2017
Jul. 31, 2016
Aug. 02, 2015
Restructuring Cost and Reserve [Line Items]          
Restructuring Charges $ 2 $ 1      
2015 Initiatives [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Charges 2 1 $ 18 $ 35 $ 102
Restructuring and Related Cost, Incurred Cost 19 9 58 82 124
Restructuring and Related Cost, Cost Incurred to Date 283        
2015 Initiatives [Member] | Severance Pay And Benefits [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Incurred Cost 2        
Restructuring and Related Cost, Cost Incurred to Date 137        
2015 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Incurred Cost 5        
Restructuring and Related Cost, Cost Incurred to Date 17        
2015 Initiatives [Member] | Implementation and Other Related Costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Incurred Cost [1] 12        
Restructuring and Related Cost, Cost Incurred to Date 129        
2015 Initiatives [Member] | General and Administrative Expense [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Incurred Cost 12 8 36 47 22
2015 Initiatives [Member] | Cost Of Products Sold [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Incurred Cost $ 5 $ 0 $ 4 $ 0 $ 0
[1] Includes other costs recognized as incurred that are not reflected in the restructuring reserve in the Consolidated Balance Sheet. The costs are included in Administrative expenses and Cost of products sold in the Consolidated Statements of Earnings.