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Accounting Policies Changes in Accounting Principles (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Sales $ 9,549 $ 8,752 $ 27,638 $ 26,296
Selling, General and Administrative 555 502 1,660 1,544
Operating Income 781 797 2,223 2,213
Other (Income) Expense $ 57 74 $ 258 225
Previously Reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Sales   8,745   26,276
Selling, General and Administrative   504   1,550
Operating Income   802   2,227
Other (Income) Expense   79   239
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Sales   7   20
Selling, General and Administrative   (2)   (6)
Operating Income   (5)   (14)
Other (Income) Expense   $ (5)   $ (14)