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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Income Tax Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount $ 160    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions $ 21 $ 8 $ 5
Federal income tax rate 21.00% 24.50% 35.00%
Impact of the Tax Act   $ 35  
Impairment and Sale of Non-Protein Businesses   3.10%  
Domestic production deduction   $ 46 $ 80
State Income Taxes $ 69 90 61
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount   (1,004)  
Income (Loss) from Continuing Operations before Income Taxes, Domestic 2,332 2,700 $ 2,603
Tax credit carryforwards 42    
Accumulated undistributed earnings of foreign subsidiaries 252 210  
Unrecognized tax benefits that would impact effective tax rate 116 216  
Unrecognized tax benefits, income tax penalties and interest accrued 46 $ 73  
Expire in fiscal 2019 - 2031 [Member]      
Income Tax Disclosure [Line Items]      
Tax credit carryforwards 38    
Foreign Country [Member]      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards 98    
Expire in fiscal years 2020-2039 [Domain] | State and Local Jurisdiction [Member]      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards 691    
Expire in fiscal years 2020-2031 [Member] | Foreign Country [Member]      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards $ 65