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Basis of Presentation and Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2017
Jul. 31, 2016
May 01, 2016
Apr. 30, 2017
May 01, 2016
Taxes on earnings $ 94   $ 55 $ 307 $ 270
Net earnings attributable to Campbell Soup Company per share, diluted $ 0.58   $ 0.59 $ 1.85 $ 2.07
Restatement Adjustment [Member]          
Taxes on earnings   $ 13      
Net earnings attributable to Campbell Soup Company per share, diluted   $ 0.04