CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) - USD ($) $ in Millions	Total	Total Deficit Attributable to Meritor, Inc.	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss	Non-controlling Interests
Beginning balance at Sep. 30, 2012	$ (982)	$ (1,023)	$ 96	$ 901	$ (1,105)	$ 0	$ (915)	$ 41
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	161	159			(22)		181	2
Vesting of restricted stock	0		1	(1)
Repurchase of convertible notes	(2)	(2)		(2)
Equity based compensation expense	5	5		5
Issuance of convertible notes	9	9		9
Non-controlling interest dividends	(15)							(15)
Other	2	2		2
Ending Balance at Sep. 30, 2013	(822)	(850)	97	914	(1,127)	0	(734)	28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	239	234			249		(15)	5
Repurchase of convertible notes	(4)	(4)		(4)
Equity based compensation expense	8	8		8
Non-controlling interest dividends	(6)							(6)
Ending Balance at Sep. 30, 2014	(585)	(612)	97	918	(878)	0	(749)	27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	46	47			64		(17)	(1)
Vesting of restricted stock	0		2	(2)
Repurchase of convertible notes	(62)	(62)		(62)
Equity based compensation expense	10	10		10
Repurchase of common stock	(55)	(55)				(55)
Non-controlling interest dividends	(1)							(1)
Other	1	1		1
Ending Balance at Sep. 30, 2015	$ (646)	$ (671)	$ 99	$ 865	$ (814)	$ (55)	$ (766)	$ 25