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Debt to Finance Acquisition of Snyder's-Lance Debt to Finance Acquisition of Snyder's-Lance (Schedule of Long-term Debt Instruments) (Details) - USD ($)
$ in Millions
9 Months Ended
Apr. 29, 2018
Jul. 30, 2017
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 5,300  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [1] (49)  
Long-term Debt $ 8,593 $ 2,499
Variable Interest Rate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 16, 2020  
Debt Instrument, Description of Variable Rate Basis Variable  
Long-term Debt, Gross $ 500  
Variable Interest Rate due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2021  
Debt Instrument, Description of Variable Rate Basis Variable  
Long-term Debt, Gross $ 400  
Variable Interest Rate Term Loan due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 26, 2021  
Debt Instrument, Description of Variable Rate Basis Variable  
Long-term Debt, Gross $ 900  
3.30% Notes due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2021  
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Long-term Debt, Gross $ 650  
3.65% Notes due 2023 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2023  
Debt Instrument, Interest Rate, Stated Percentage 3.65%  
Long-term Debt, Gross $ 1,200  
3.95% Notes due 2025 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2025  
Debt Instrument, Interest Rate, Stated Percentage 3.95%  
Long-term Debt, Gross $ 850  
4.15% Notes due 2028 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2028  
Debt Instrument, Interest Rate, Stated Percentage 4.15%  
Long-term Debt, Gross $ 1,000  
4.80% Notes due 2048 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2048  
Debt Instrument, Interest Rate, Stated Percentage 4.80%  
Long-term Debt, Gross $ 700  
Debt to Finance Acquisition [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 6,151  
[1] Includes unamortized discount on debt issuances and debt issuance costs.