Goodwill and Other Intangible Assets Changes in Carrying Amount of Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Goodwill [Roll Forward]
Goodwill, Beginning Balance		$ 6,982	$ 7,016
Business Acquisitions		266	79	100
Business Divestitures	(177)	(266)	(34)
Impairments	(430)	(430)	0
Currency Translation and Other		37	(79)
Goodwill, Ending Balance	6,589	6,589	6,982	7,016
Power Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance		1,040	1,004
Business Acquisitions		0	45
Business Divestitures		0	0
Impairments		0	0
Currency Translation and Other		14	(9)
Goodwill, Ending Balance	1,054	1,054	1,040
North America Systems | Building Efficiency
Goodwill [Roll Forward]
Goodwill, Beginning Balance		521	519
Business Acquisitions		0	0
Business Divestitures		0	0
Impairments		0	0
Currency Translation and Other		(1)	2
Goodwill, Ending Balance	520	520	521
North America Service | Building Efficiency
Goodwill [Roll Forward]
Goodwill, Beginning Balance		708	710
Business Acquisitions		0	0
Business Divestitures		0	(2)
Impairments		0	0
Currency Translation and Other		0	0
Goodwill, Ending Balance	708	708	708
Global Workplace Solutions | Building Efficiency
Goodwill [Roll Forward]
Goodwill, Beginning Balance		187	184
Business Acquisitions		79	0
Business Divestitures		0	0
Impairments		0	0
Currency Translation and Other		(9)	3
Goodwill, Ending Balance	257	257	187
Building Efficiency Asia | Building Efficiency
Goodwill [Roll Forward]
Goodwill, Beginning Balance		396	391
Business Acquisitions		0	0
Business Divestitures		0	0
Impairments		0	0
Currency Translation and Other		(8)	5
Goodwill, Ending Balance	388	388	396
Building Efficiency Other | Building Efficiency
Goodwill [Roll Forward]
Goodwill, Beginning Balance		994	1,065
Business Acquisitions		0	0
Business Divestitures		0	(32)
Impairments		0	0
Currency Translation and Other		9	(39)
Goodwill, Ending Balance	1,003	1,003	994
Seating | Automotive Experience
Goodwill [Roll Forward]
Goodwill, Beginning Balance		2,484	2,505
Business Acquisitions		187	34
Business Divestitures		(15)	0
Impairments		0	0
Currency Translation and Other		3	(55)
Goodwill, Ending Balance	2,659	2,659	2,484
Interiors | Automotive Experience
Goodwill [Roll Forward]
Goodwill, Beginning Balance		402	387
Business Acquisitions		0	0
Business Divestitures		0	0
Impairments		(430)	0
Currency Translation and Other		28	15
Goodwill, Ending Balance	0	0	402
Electronics | Automotive Experience
Goodwill [Roll Forward]
Goodwill, Beginning Balance		250	251
Business Acquisitions		0	0
Business Divestitures		(251)	0
Impairments		0	0
Currency Translation and Other		1	(1)
Goodwill, Ending Balance	0	0	250
2012 Additional Acquisitions [Member]
Goodwill [Roll Forward]
Business Acquisitions			$ 50