SUPPLEMENTAL PARENT AND GUARANTOR CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 2) - USD ($) $ in Millions		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
CURRENT ASSETS
Cash and cash equivalents		$ 193	$ 247	$ 318	$ 257
Receivables trade and other, net		461	610
Inventories		338	379
Other current assets		50	56
TOTAL CURRENT ASSETS		1,042	1,292
NET PROPERTY		419	424
GOODWILL		402	431	434
OTHER ASSETS	[1]	332	338
INVESTMENTS IN SUBSIDIARIES		0	0
TOTAL ASSETS		2,195	2,485	2,552
CURRENT LIABILITIES
Short-term debt		15	7
Accounts and notes payable		574	680
Other current liabilities		279	351
TOTAL CURRENT LIABILITIES		868	1,038
LONG-TERM DEBT	[1]	1,036	948
RETIREMENT BENEFITS		632	775
INTERCOMPANY PAYABLE (RECEIVABLE)		0	0
OTHER LIABILITIES		305	309
EQUITY (DEFICIT) ATTRIBUTABLE TO MERITOR, INC.		(671)	(612)
NONCONTROLLING INTERESTS		25	27
TOTAL LIABILITIES AND DEFICIT		2,195	2,485
Parent
CURRENT ASSETS
Cash and cash equivalents		73	71	144	91
Receivables trade and other, net		1	1
Inventories		0	0
Other current assets		4	9
TOTAL CURRENT ASSETS		78	81
NET PROPERTY		15	13
GOODWILL		0	0
OTHER ASSETS		61	58
INVESTMENTS IN SUBSIDIARIES		2,354	2,185
TOTAL ASSETS		2,508	2,337
CURRENT LIABILITIES
Short-term debt		1	1
Accounts and notes payable		55	46
Other current liabilities		93	97
TOTAL CURRENT LIABILITIES		149	144
LONG-TERM DEBT		1,017	899
RETIREMENT BENEFITS		603	656
INTERCOMPANY PAYABLE (RECEIVABLE)		1,365	1,198
OTHER LIABILITIES		45	52
EQUITY (DEFICIT) ATTRIBUTABLE TO MERITOR, INC.		(671)	(612)
NONCONTROLLING INTERESTS		0	0
TOTAL LIABILITIES AND DEFICIT		2,508	2,337
Guarantors
CURRENT ASSETS
Cash and cash equivalents		6	5	6	3
Receivables trade and other, net		40	45
Inventories		159	151
Other current assets		20	18
TOTAL CURRENT ASSETS		225	219
NET PROPERTY		183	158
GOODWILL		219	277
OTHER ASSETS		129	128
INVESTMENTS IN SUBSIDIARIES		313	267
TOTAL ASSETS		1,069	1,049
CURRENT LIABILITIES
Short-term debt		4	3
Accounts and notes payable		213	230
Other current liabilities		83	87
TOTAL CURRENT LIABILITIES		300	320
LONG-TERM DEBT		6	10
RETIREMENT BENEFITS		0	0
INTERCOMPANY PAYABLE (RECEIVABLE)		(1,886)	(1,736)
OTHER LIABILITIES		217	208
EQUITY (DEFICIT) ATTRIBUTABLE TO MERITOR, INC.		2,432	2,247
NONCONTROLLING INTERESTS		0	0
TOTAL LIABILITIES AND DEFICIT		1,069	1,049
Non- Guarantors
CURRENT ASSETS
Cash and cash equivalents		114	171	168	163
Receivables trade and other, net		420	564
Inventories		179	228
Other current assets		26	29
TOTAL CURRENT ASSETS		739	992
NET PROPERTY		221	253
GOODWILL		183	154
OTHER ASSETS		142	152
INVESTMENTS IN SUBSIDIARIES		0	0
TOTAL ASSETS		1,285	1,551
CURRENT LIABILITIES
Short-term debt		10	3
Accounts and notes payable		306	404
Other current liabilities		103	167
TOTAL CURRENT LIABILITIES		419	574
LONG-TERM DEBT		13	39
RETIREMENT BENEFITS		29	119
INTERCOMPANY PAYABLE (RECEIVABLE)		521	538
OTHER LIABILITIES		43	49
EQUITY (DEFICIT) ATTRIBUTABLE TO MERITOR, INC.		235	205
NONCONTROLLING INTERESTS		25	27
TOTAL LIABILITIES AND DEFICIT		1,285	1,551
Elims
CURRENT ASSETS
Cash and cash equivalents		0	0	$ 0	$ 0
Receivables trade and other, net		0	0
Inventories		0	0
Other current assets		0	0
TOTAL CURRENT ASSETS		0	0
NET PROPERTY		0	0
GOODWILL		0	0
OTHER ASSETS		0	0
INVESTMENTS IN SUBSIDIARIES		(2,667)	(2,452)
TOTAL ASSETS		(2,667)	(2,452)
CURRENT LIABILITIES
Short-term debt		0	0
Accounts and notes payable		0	0
Other current liabilities		0	0
TOTAL CURRENT LIABILITIES		0	0
LONG-TERM DEBT		0	0
RETIREMENT BENEFITS		0	0
INTERCOMPANY PAYABLE (RECEIVABLE)		0	0
OTHER LIABILITIES		0	0
EQUITY (DEFICIT) ATTRIBUTABLE TO MERITOR, INC.		(2,667)	(2,452)
NONCONTROLLING INTERESTS		0	0
TOTAL LIABILITIES AND DEFICIT		$ (2,667)	$ (2,452)

[1] Prior year amounts have been recast to reflect the early adoption of ASU 2015-03, Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.