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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Income Tax Disclosures [Line Items]      
Domestic production deduction $ 80 $ 68 $ 72
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 61 70 59
Decrease in unrecognized tax benefits   43 34
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount     73
Income (Loss) from Continuing Operations before Income Taxes, Domestic 2,603 2,543 $ 1,908
Tax credit carryforwards 52    
Accumulated undistributed earnings of foreign subsidiaries 182 219  
Unrecognized tax benefits that would impact effective tax rate 205    
Unrecognized tax benefits, income tax penalties and interest accrued 63 $ 52  
Decrease in Unrecognized Tax Benefits is Reasonably Possible 9    
Expire in fiscal 2018 - 2031 [Member]      
Income Tax Disclosures [Line Items]      
Tax credit carryforwards 45    
State and Local Jurisdiction [Member]      
Income Tax Disclosures [Line Items]      
Operating loss carryforwards 806    
Foreign Country [Member]      
Income Tax Disclosures [Line Items]      
Operating loss carryforwards 39    
Domestic Tax Authority [Member]      
Income Tax Disclosures [Line Items]      
Operating loss carryforwards $ 12