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Note 4, Product Warranties (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Product Warranties Disclosures [Abstract]        
Standard Product Warranty Accrual $ 9 $ 20 $ 13 $ 12
Standard Product Warranty Accrual, Increase for Warranties Issued 2 7    
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties (1) 4    
Standard Product Warranty Accrual, Decrease for Payments (5) (4)    
Standard Product Warranty Accrual, Foreign Currency Translation Gain (Loss) $ 0 $ 1