QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details Textuals) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Restructuring costs	$ 1	$ 9	$ 3	$ 3	$ 7		$ 2	$ 1	$ 16	$ 10	$ 23
Net income (loss)	(21)	$ 13	$ 43	$ 29	3	$ 234	$ 1	$ 11	64	249	(22)
Pension settlement losses									59	0	109
Goodwill impairment	15								15	0	0
Impairment of long-lived assets	2
ZF Meritor LLC (Commercial Truck & Industrial)
Net income (loss)						$ 209
Non-U.S. Plans
Pension settlement losses	$ 59
U.S. Retiree Medical Plan
Recognized prior service costs due to curtailment					$ 15				0	$ 15	$ 0
Italy, Mexico, Sweden and Germany
Non-cash benefit for the reversal of valuation allowances									$ 16