Nonconsolidated Partially-Owned Affiliates - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 4,268	$ 4,663
Gross profit	456	566
Net income	195	221
Net income attributable to the entity	$ 190	$ 216