CONDENSED CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss	Total Deficit Attributable to Meritor, Inc.	Noncontrolling Interests
Beginning balance at Sep. 30, 2013	$ (822)	$ 97	$ 914	$ (1,127)	$ 0	$ (734)	$ (850)	$ 28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	291			246		41	287	4
Equity based compensation expense	6		6				6
Noncontrolling interest dividends	(1)							(1)
Other equity adjustments	(1)		(1)				(1)
Ending Balance at Jun. 30, 2014	(527)	97	919	(881)	0	(693)	(558)	31
Beginning balance at Sep. 30, 2014	(585)	97	918	(878)	0	(749)	(612)	27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	65			85		(21)	64	1
Equity based compensation expense	8		8				8
Vesting of restricted stock	0	2	(2)
Repurchase of convertible notes	(48)		(48)				(48)
Repurchase of common stock	(30)				(30)		(30)
Noncontrolling interest dividends	(1)							(1)
Ending Balance at Jun. 30, 2015	$ (591)	$ 99	$ 876	$ (793)	$ (30)	$ (770)	$ (618)	$ 27