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Accounting Policies Changes in Accounting Principles (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cost of Sales $ 8,838 $ 8,786
Selling, General and Administrative 548 521
Operating Income 807 922
Other (Income) Expense $ 94 80
Previously Reported [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cost of Sales   8,778
Selling, General and Administrative   524
Operating Income   927
Other (Income) Expense   85
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cost of Sales   8
Selling, General and Administrative   (3)
Operating Income   (5)
Other (Income) Expense   $ (5)