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Fair Value Measurements Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Apr. 01, 2017
Oct. 03, 2015
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
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       $ 214 $ 45 $ 285
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       18.60% 18.90%  
Chicken Production Operations in China [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Goodwill, Impairment Loss     $ 23      
Property, Plant and Equipment, Transfers and Changes     126      
Impairment of other assets     20      
Prepared Foods [Member] | San Diego Prepared Foods operation [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges   $ 52        
Property, Plant and Equipment, Transfers and Changes   43        
Impairment of Intangible Assets, Finite-lived   8        
Impairment of other assets   1        
Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Cost of Sales [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges   44        
Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Selling, General and Administrative Expenses [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges   8        
Other [Member] | 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      
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      
Facility Closing [Member] | Operating Segments [Member] | Prepared Foods [Member] | Cost of Sales [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges     49      
Facility Closing [Member] | Operating Segments [Member] | Prepared Foods [Member] | Selling, General and Administrative Expenses [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges     10      
Fair Value, Measurements, Nonrecurring [Member] | Prepared Foods [Member] | San Diego Prepared Foods operation [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges   52        
Property, Plant and Equipment, Transfers and Changes   43        
Impairment of Intangible Assets, Finite-lived   8        
Impairment of other assets   1        
Fair Value, Measurements, Nonrecurring [Member] | Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Cost of Sales [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges   44        
Fair Value, Measurements, Nonrecurring [Member] | Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Selling, General and Administrative Expenses [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges   $ 8        
Fair Value, Measurements, Nonrecurring [Member] | Other [Member] | 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      
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] | Prepared Foods [Member] | Cost of Sales [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] | Prepared Foods [Member] | Selling, General and Administrative Expenses [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       32 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%  
Non-Protein Business [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges $ 45          
Non-Protein Business [Member] | Operating Segments [Member] | Prepared Foods [Member] | Cost of Sales [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges 45          
Non-Protein Business [Member] | Fair Value, Measurements, Nonrecurring [Member] | Operating Segments [Member] | Prepared Foods [Member] | Cost of Sales [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset Impairment Charges $ 45