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Acquistions Acquisitions (Intangible assets acquired) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 28, 2018
Jan. 27, 2019
Snyder's-Lance [Member]    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 2,761  
Snyder's-Lance [Member] | Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets $ 756  
Snyder's-Lance [Member] | Noncompete Agreements [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life 1 year 6 months  
Finite-Lived Intangible Assets $ 8  
Snyder's-Lance [Member] | Trademarks [Member]    
Business Acquisition [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 1,997  
Minimum [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life   2 years
Minimum [Member] | Snyder's-Lance [Member] | Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Maximum [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life   22 years
Maximum [Member] | Snyder's-Lance [Member] | Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life 22 years