SUPPLEMENTAL PARENT AND GUARANTOR CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Sales
Sales	$ 933	$ 979	$ 954	$ 900	$ 902	$ 986	$ 900	$ 884	$ 3,766	$ 3,672	$ 4,384
Cost of sales	(793)	(855)	(836)	(795)	(793)	(877)	(805)	(802)	(3,279)	(3,277)	(3,902)
GROSS MARGIN	140	124	118	105	109	109	95	82	487	395	482
Selling, general and administrative									(258)	(253)	(282)
Pension settlement losses					(73)	(36)			0	(109)	0
Restructuring	(7)		(2)	(1)		(12)	(11)	(3)	(10)	(23)	(39)
Gain on sale of property									0	0	16
Other operating expense, net									(2)	(3)	(4)
OPERATING INCOME									217	7	173
Other income (expense), net									0	3	7
Gain on sale of equity investment									0	125	0
Equity in earnings of affiliates									38	42	52
Interest income (expense), net									(130)	(126)	(95)
INCOME BEFORE INCOME TAXES									315	51	137
Provision for income taxes	0	(12)	(8)	(11)	(45)	(1)	(7)	(11)	(31)	(64)	(57)
Equity income from continuing operations of subsidiaries									0	0	0
INCOME (LOSS) FROM CONTINUING OPERATIONS									284	(13)	80
LOSS FROM DISCONTINUED OPERATIONS, net of tax									(30)	(7)	(17)
NET INCOME (LOSS)	4	234	3	13	43	(39)	(4)	(20)	254	(20)	63
Less: Net income attributable to noncontrolling interests									(5)	(2)	(11)
Net income (loss)	3	234	1	11	41	(39)	(3)	(21)	249	(22)	52
External Sales [Member]
Sales
Sales									3,766	3,672	4,384
Subsidiaries Sales [Member]
Sales
Sales									0	0	0
ZF Meritor LLC [Member]
Sales
Equity in earnings of affiliates									190	0	0
Net income (loss)		209
Other equity method investments [Member]
Sales
Equity in earnings of affiliates									38	42	52
Parent [Member]
Sales
Sales									0	0	0
Cost of sales									(56)	(54)	(50)
GROSS MARGIN									(56)	(54)	(50)
Selling, general and administrative									(65)	(72)	(75)
Pension settlement losses										(73)
Restructuring									0	(3)	0
Gain on sale of property											0
Other operating expense, net									(1)	(2)	(2)
OPERATING INCOME									(122)	(204)	(127)
Other income (expense), net									35	39	42
Gain on sale of equity investment										0
Equity in earnings of affiliates										0	0
Interest income (expense), net									(159)	(154)	(121)
INCOME BEFORE INCOME TAXES									(246)	(319)	(206)
Provision for income taxes									0	(1)	0
Equity income from continuing operations of subsidiaries									525	305	275
INCOME (LOSS) FROM CONTINUING OPERATIONS									279	(15)	69
LOSS FROM DISCONTINUED OPERATIONS, net of tax									(30)	(7)	(17)
NET INCOME (LOSS)									249	(22)	52
Less: Net income attributable to noncontrolling interests									0	0	0
Net income (loss)									249	(22)	52
Parent [Member] | External Sales [Member]
Sales
Sales									0	0	0
Parent [Member] | Subsidiaries Sales [Member]
Sales
Sales									0	0	0
Parent [Member] | ZF Meritor LLC [Member]
Sales
Equity in earnings of affiliates									0
Parent [Member] | Other equity method investments [Member]
Sales
Equity in earnings of affiliates									0
Guarantors [Member]
Sales
Sales									1,609	1,545	1,828
Cost of sales									(1,343)	(1,339)	(1,579)
GROSS MARGIN									266	206	249
Selling, general and administrative									(102)	(87)	(102)
Pension settlement losses										0
Restructuring									(1)	(8)	0
Gain on sale of property											0
Other operating expense, net									(1)	(1)	0
OPERATING INCOME									162	110	147
Other income (expense), net									23	21	27
Gain on sale of equity investment										60
Equity in earnings of affiliates										24	34
Interest income (expense), net									35	34	22
INCOME BEFORE INCOME TAXES									440	249	230
Provision for income taxes									(1)	(17)	(5)
Equity income from continuing operations of subsidiaries									71	57	35
INCOME (LOSS) FROM CONTINUING OPERATIONS									510	289	260
LOSS FROM DISCONTINUED OPERATIONS, net of tax									(31)	(8)	(5)
NET INCOME (LOSS)									479	281	255
Less: Net income attributable to noncontrolling interests									0	0	0
Net income (loss)									479	281	255
Guarantors [Member] | External Sales [Member]
Sales
Sales									1,467	1,409	1,679
Guarantors [Member] | Subsidiaries Sales [Member]
Sales
Sales									142	136	149
Guarantors [Member] | ZF Meritor LLC [Member]
Sales
Equity in earnings of affiliates									190
Guarantors [Member] | Other equity method investments [Member]
Sales
Equity in earnings of affiliates									30
Non-Guarantors [Member]
Sales
Sales									2,361	2,319	2,776
Cost of sales									(2,084)	(2,076)	(2,493)
GROSS MARGIN									277	243	283
Selling, general and administrative									(91)	(94)	(105)
Pension settlement losses										(36)
Restructuring									(9)	(12)	(39)
Gain on sale of property											16
Other operating expense, net									0	0	(2)
OPERATING INCOME									177	101	153
Other income (expense), net									(58)	(57)	(62)
Gain on sale of equity investment										65
Equity in earnings of affiliates										18	18
Interest income (expense), net									(6)	(6)	4
INCOME BEFORE INCOME TAXES									121	121	113
Provision for income taxes									(30)	(46)	(52)
Equity income from continuing operations of subsidiaries									0	0	0
INCOME (LOSS) FROM CONTINUING OPERATIONS									91	75	61
LOSS FROM DISCONTINUED OPERATIONS, net of tax									(12)	(237)	(1)
NET INCOME (LOSS)									79	(162)	60
Less: Net income attributable to noncontrolling interests									(5)	(2)	(11)
Net income (loss)									74	(164)	49
Non-Guarantors [Member] | External Sales [Member]
Sales
Sales									2,299	2,263	2,705
Non-Guarantors [Member] | Subsidiaries Sales [Member]
Sales
Sales									62	56	71
Non-Guarantors [Member] | ZF Meritor LLC [Member]
Sales
Equity in earnings of affiliates									0
Non-Guarantors [Member] | Other equity method investments [Member]
Sales
Equity in earnings of affiliates									8
Elims [Member]
Sales
Sales									(204)	(192)	(220)
Cost of sales									204	192	220
GROSS MARGIN									0	0	0
Selling, general and administrative									0	0	0
Pension settlement losses										0
Restructuring									0	0	0
Gain on sale of property											0
Other operating expense, net									0	0	0
OPERATING INCOME									0	0	0
Other income (expense), net									0	0	0
Gain on sale of equity investment										0
Equity in earnings of affiliates										0	0
Interest income (expense), net									0	0	0
INCOME BEFORE INCOME TAXES									0	0	0
Provision for income taxes									0	0	0
Equity income from continuing operations of subsidiaries									(596)	(362)	(310)
INCOME (LOSS) FROM CONTINUING OPERATIONS									(596)	(362)	(310)
LOSS FROM DISCONTINUED OPERATIONS, net of tax									43	245	6
NET INCOME (LOSS)									(553)	(117)	(304)
Less: Net income attributable to noncontrolling interests									0	0	0
Net income (loss)									(553)	(117)	(304)
Elims [Member] | External Sales [Member]
Sales
Sales									0	0	0
Elims [Member] | Subsidiaries Sales [Member]
Sales
Sales									(204)	(192)	(220)
Elims [Member] | ZF Meritor LLC [Member]
Sales
Equity in earnings of affiliates									0
Elims [Member] | Other equity method investments [Member]
Sales
Equity in earnings of affiliates									$ 0