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Fair Value Measurements Fair Value Measurements (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 03, 2015
USD ($)
Oct. 01, 2016
USD ($)
Oct. 03, 2015
USD ($)
Sep. 27, 2014
USD ($)
Facilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net   $ 0 $ 0  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent   0 0  
Asset Impairment Charges   $ 45 285 $ 107
Goodwill, Impairment Loss     23  
Beef [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill, Impairment Loss     0  
Prepared Foods [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill, Impairment Loss     0  
Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill, Impairment Loss [1]     $ 23  
Other [Member] | Chicken Production Operations in Brazil [Member] | Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges       39
Facility Closing [Member] | Operating Segments [Member] | Beef [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges $ 12      
Facility Closing [Member] | Operating Segments [Member] | Prepared Foods [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 59     $ 52
Plants Closed | Facilities       3
Facility Closing [Member] | Operating Segments [Member] | Cost of Sales [Member] | Prepared Foods [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 49      
Facility Closing [Member] | Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Prepared Foods [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 10      
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Beef [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 12      
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Prepared Foods [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 59      
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Cost of Sales [Member] | Prepared Foods [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 49      
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Prepared Foods [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 10      
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   31 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%  
Chicken Production Operations in China [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Property, Plant and Equipment, Transfers and Changes 126      
Goodwill, Impairment Loss 23      
Impairment of other assets 20      
Chicken Production Operations in China [Member] | Cost of Sales [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 169      
Chicken Production Operations in China [Member] | Cost of Sales [Member] | Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges 169      
Chicken Production Operations in China [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost of Sales [Member] | Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges $ 169      
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   18.90% 20.00%  
[1] Other included the goodwill from our foreign chicken operation.