Other Deductions, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Other Income and Expenses [Abstract]
Amortization of intangibles (intellectual property and customer relationships)	$ 84	$ 94	$ 95
Restructuring costs	96	138	39
Other	114	98	77
Total	294	330	211
Change in gain (loss) from foreign currency transactions	(67)	(15)
Change in litigation costs (increase) decrease	30	$ (29)
Dumping duties received	$ 21
Loss from equity method investment			$ (34)