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Accounting Policies Changes in Accounting Principles (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Sales $ 9,251 $ 8,758 $ 18,089 $ 17,544
Selling, General and Administrative 557 521 1,105 1,042
Operating Income 635 494 1,442 1,416
Other (Income) Expense $ 107 71 $ 201 151
Previously Reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Sales   8,753   17,531
Selling, General and Administrative   522   1,046
Operating Income   498   1,425
Other (Income) Expense   75   160
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Sales   5   13
Selling, General and Administrative   (1)   (4)
Operating Income   (4)   (9)
Other (Income) Expense   $ (4)   $ (9)