Basis of Presentation and Significant Accounting Polices (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jan. 31, 2016
Feb. 01, 2015
Jan. 31, 2016
Feb. 01, 2015
Aug. 02, 2015
Aug. 04, 2014
Cost of products sold $ 1,382 $ 1,491 $ 2,830 $ 2,951    
Marketing and selling expenses 223 239 449 482    
Administrative expenses 146 135 302 266    
Research and development expenses 23 25 55 53    
Earnings before interest and taxes 414 337 729 726    
Earnings before taxes 387 312 674 676    
Taxes on earnings 122 90 215 206    
Net earnings 265 222 459 470    
Net earnings attributable to Campbell Soup Company $ 265 $ 222 $ 459 $ 470    
Earnings Per Share, Basic $ 0.85 $ 0.71 $ 1.48 $ 1.50    
Earnings Per Share, Diluted $ 0.85 $ 0.71 $ 1.47 $ 1.50    
Foreign currency translation adjustments, before tax $ (17) $ (157) $ (43) $ (238)    
Net actuarial gain (loss) arising during the period, before tax 0 0 0 0    
Reclassification of net actuarial loss included in net earnings 0 0 0 0    
Tax benefit/(expense) 0 0 0 0    
Inventories 855   855   $ 995  
Other current assets 201   201   198  
Accrued income taxes 75   75   29  
Earnings retained in the business 2,017   2,017   1,754  
Accumulated other comprehensive loss (223)   (223)   (168)  
Pension and postretirement benefit expense/(income)     109 (12)    
Deferred income taxes     (14) 18    
Other, net     4 10    
Inventories     133 73    
Accounts payable and accrued liabilities     (30) (16)    
Net cash provided by operating activities     727 584    
Prior accounting principles [Member]            
Cost of products sold 1,404   2,816      
Marketing and selling expenses 233   449      
Administrative expenses 154   303      
Research and development expenses 26   55      
Earnings before interest and taxes 371   742      
Earnings before taxes 344   687      
Taxes on earnings 108   218      
Net earnings 236   469      
Net earnings attributable to Campbell Soup Company $ 236   $ 469      
Earnings Per Share, Basic $ 0.76   $ 1.51      
Earnings Per Share, Diluted $ 0.76   $ 1.50      
Foreign currency translation adjustments, before tax $ (17)   $ (43)      
Net actuarial gain (loss) arising during the period, before tax 23   (113)      
Reclassification of net actuarial loss included in net earnings 32   109      
Tax benefit/(expense) (20)   2      
Inventories 862   862      
Other current assets 199   199      
Accrued income taxes 73   73      
Earnings retained in the business 2,767   2,767      
Accumulated other comprehensive loss (966)   (966)      
Pension and postretirement benefit expense/(income)     0      
Deferred income taxes     (9)      
Other, net     109      
Inventories     124      
Accounts payable and accrued liabilities     (32)      
Net cash provided by operating activities     727      
Previously reported [Member]            
Cost of products sold   1,506   2,978    
Marketing and selling expenses   242   489    
Administrative expenses   140   275    
Research and development expenses   27   56    
Earnings before interest and taxes   312   680    
Earnings before taxes   287   630    
Taxes on earnings   80   189    
Net earnings   207   441    
Net earnings attributable to Campbell Soup Company   $ 207   $ 441    
Earnings Per Share, Basic   $ 0.66   $ 1.41    
Earnings Per Share, Diluted   $ 0.66   $ 1.40    
Foreign currency translation adjustments, before tax   $ (167)   $ (250)    
Net actuarial gain (loss) arising during the period, before tax   13   17    
Reclassification of net actuarial loss included in net earnings   24   48    
Tax benefit/(expense)   (12)   (22)    
Inventories         993  
Other current assets         199  
Accrued income taxes         29  
Earnings retained in the business         2,494  
Accumulated other comprehensive loss         (909)  
Pension and postretirement benefit expense/(income)       0    
Deferred income taxes       1    
Other, net       46    
Inventories       71    
Accounts payable and accrued liabilities       (16)    
Net cash provided by operating activities       584    
Restatement adjustment [Member]            
Cost of products sold (22) (15) 14 (27)    
Marketing and selling expenses (10) (3) 0 (7)    
Administrative expenses (8) (5) (1) (9)    
Research and development expenses (3) (2) 0 (3)    
Earnings before interest and taxes 43 25 (13) 46    
Earnings before taxes 43 25 (13) 46    
Taxes on earnings 14 10 (3) 17    
Net earnings 29 15 (10) 29    
Net earnings attributable to Campbell Soup Company $ 29 $ 15 $ (10) $ 29    
Earnings Per Share, Basic $ 0.09 $ 0.05 $ (0.03) $ 0.09    
Earnings Per Share, Diluted $ 0.09 $ 0.05 $ (0.03) $ 0.09    
Foreign currency translation adjustments, before tax $ 0 $ 10 $ 0 $ 12    
Net actuarial gain (loss) arising during the period, before tax (23) (13) 113 (17)    
Reclassification of net actuarial loss included in net earnings (32) (24) (109) (48)    
Tax benefit/(expense) 20 $ 12 (2) 22    
Inventories (7)   (7)   2 $ (2)
Other current assets 2   2   (1) 1
Accrued income taxes 2   2   0  
Earnings retained in the business (750)   (750)   (740) (715)
Accumulated other comprehensive loss $ 743   743   $ 741 $ 714
Pension and postretirement benefit expense/(income)     109 (12)    
Deferred income taxes     (5) 17    
Other, net     (105) (36)    
Inventories     9 2    
Accounts payable and accrued liabilities     2 0    
Net cash provided by operating activities     $ 0 $ 0