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Debt Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Jan. 31, 2020
Sep. 28, 2019
Dec. 29, 2018
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000      
Multiemployer Plans, Withdrawal Obligation 156     $ 32
Line of Credit Facility, Remaining Borrowing Capacity 2,900      
Principal repayments on long-term debt in 2020 620      
Principal repayments on long-term debt in 2021 835      
Principal repayments on long-term debt in 2022 1,039      
Principal repayments on long-term debt in 2023 771      
Principal repayments on long-term debt in 2024 677      
Principal repayments on long-term debt in 2025 and beyond 3,896      
Five Year Credit Agreement        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 1,500      
Three Hundred Sixty Four Day Revolving Credit Agreement [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 1,000 $ 1,000    
Expired Three Hundred Sixty Four Day Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 1,000      
Letter of Credit [Member] | Five Year Credit Agreement        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 75      
Euro Commercial Paper [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 750      
Debt Instrument, Term 364 days      
Line of Credit Facility, Maximum Month-end Outstanding Amount $ 0      
European Swingline Loans [Member] | Five Year Credit Agreement        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 300      
Cookies, fruit and fruit flavored snacks, pie crusts and ice cream cones businesses        
Debt Instrument [Line Items]        
Multiemployer Plans, Withdrawal Obligation     $ 132  
Maximum        
Debt Instrument [Line Items]        
Multiemployer Plans, Withdrawal Obligation $ 250