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Acquistions Acquisitions (Intangible assets acquired) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 26, 2018
Jul. 29, 2018
Snyder's-Lance [Member]    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 2,947  
Snyder's-Lance [Member] | Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets $ 808  
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) $ 2,131  
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