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Fair Value Measurements Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 02, 2021
Oct. 03, 2020
Sep. 28, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability, Collateral, Right to Reclaim Cash, Offset $ 56 $ 16  
Asset Impairment Charges $ 60 $ 48 $ 94
Wal-Mart Stores, Inc. [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Concentration, Percentage 16.30% 16.50%  
Prepared Foods business [Member] | Prepared Foods [Member] | Cost of Sales [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset Impairment Charges     $ 41
Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short Term Investment Maturity Period 12 months    
Available For Sale Securities Debt Maturity Period 48 years    
Maximum [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Concentration, Percentage 10.00% 10.00%