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Restructuring Charges and Cost Savings Initiatives (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 29, 2017
USD ($)
$ / shares
Jan. 31, 2016
USD ($)
$ / shares
Jan. 29, 2017
USD ($)
$ / shares
Jan. 31, 2016
USD ($)
$ / shares
Jul. 31, 2016
USD ($)
$ / shares
Aug. 02, 2015
USD ($)
$ / shares
Restructuring Cost and Reserve [Line Items]            
Restructuring charges $ (1) $ 9 $ 0 $ 30    
Corporate, Non-Segment [Member] | Other Cost Savings Implementation Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Incurred Cost   7 11 22    
2015 Initiatives [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges (1) 12 0 33 $ 35 $ 102
Restructuring and Related Cost, Incurred Cost 2 19 11 55 82 124
Restructuring charges and related costs, after tax $ 1 $ 12 $ 7 $ 35 $ 52 $ 78
Restructuring charges per diluted share | $ / shares $ 0.00 $ 0.04 $ 0.02 $ 0.11 $ 0.17 $ 0.25
Payments to Acquire Productive Assets     $ 105      
2015 Initiatives [Member] | Severance Pay And Benefits [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges     $ 0      
2015 Initiatives [Member] | Other Non-cash Benefit Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Incurred Cost           $ 7
2015 Initiatives [Member] | UNITED STATES            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Number of Positions Eliminated     471      
2015 Initiatives [Member] | Americas Simple Meals and Beverages [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost Allocation 33.00%   33.00%      
Restructuring and Related Cost, Incurred Cost $ 0   $ 0      
2015 Initiatives [Member] | Global Biscuits and Snacks [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost Allocation 32.00%   32.00%      
Restructuring and Related Cost, Incurred Cost $ (1)   $ 2      
2015 Initiatives [Member] | Campbell Fresh [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost Allocation 3.00%   3.00%      
Restructuring and Related Cost, Incurred Cost $ 0   $ 0      
2015 Initiatives [Member] | Corporate, Non-Segment [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost Allocation 32.00%   32.00%      
Restructuring and Related Cost, Incurred Cost $ 3   $ 9      
2015 Initiatives [Member] | Minimum [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost 250   250      
2015 Initiatives [Member] | Minimum [Member] | Severance Pay And Benefits [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost 130   130      
2015 Initiatives [Member] | Minimum [Member] | Implementation and Other Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost 120   120      
2015 Initiatives [Member] | Maximum [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost 270   270      
2015 Initiatives [Member] | Maximum [Member] | Severance Pay And Benefits [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost 135   135      
2015 Initiatives [Member] | Maximum [Member] | Implementation and Other Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost $ 135   $ 135      
2014 Initiatives [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges   $ (3)     $ (4)  
Restructuring charges and related costs, after tax   $ (2)     $ (3)  
Restructuring charges per diluted share | $ / shares   $ 0.01     $ 0.01  
2014 Initiatives [Member] | Severance Pay And Benefits [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges         $ (4)