Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2012	Mar. 31, 2013	Sep. 30, 2012
Goodwill [Roll Forward]
Goodwill, Beginning Balance		$ 6,982	$ 7,040
Business Acquisitions		177	(5)
Business Divestitures	(29)	0	(5)
Currency Translation and Other		(62)	(48)
Goodwill, Ending Balance	7,040	7,097	6,982
Building Efficiency | North America Systems
Goodwill [Roll Forward]
Goodwill, Beginning Balance		521	520
Business Acquisitions		0	0
Business Divestitures		0	0
Currency Translation and Other		0	1
Goodwill, Ending Balance		521	521
Building Efficiency | North America Service
Goodwill [Roll Forward]
Goodwill, Beginning Balance		708	708
Business Acquisitions		0	0
Business Divestitures		0	0
Currency Translation and Other		0	0
Goodwill, Ending Balance		708	708
Building Efficiency | Global Workplace Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance		187	186
Business Acquisitions		37	0
Business Divestitures		0	0
Currency Translation and Other		(5)	1
Goodwill, Ending Balance		219	187
Building Efficiency | Asia
Goodwill [Roll Forward]
Goodwill, Beginning Balance		396	391
Business Acquisitions		0	0
Business Divestitures		0	0
Currency Translation and Other		(11)	5
Goodwill, Ending Balance		385	396
Building Efficiency | Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance		994	1,034
Business Acquisitions		0	0
Business Divestitures		0	(5)
Currency Translation and Other		4	(35)
Goodwill, Ending Balance		998	994
Automotive Experience | Seating
Goodwill [Roll Forward]
Goodwill, Beginning Balance		2,484	2,493
Business Acquisitions		140	21
Business Divestitures		0	0
Currency Translation and Other		(47)	(30)
Goodwill, Ending Balance		2,577	2,484
Automotive Experience | Interiors
Goodwill [Roll Forward]
Goodwill, Beginning Balance		402	383
Business Acquisitions		0	0
Business Divestitures		0	0
Currency Translation and Other		(1)	19
Goodwill, Ending Balance		401	402
Automotive Experience | Electronics
Goodwill [Roll Forward]
Goodwill, Beginning Balance		250	250
Business Acquisitions		0	0
Business Divestitures		0	0
Currency Translation and Other		0	0
Goodwill, Ending Balance		250	250
Power Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance		1,040	1,075
Business Acquisitions		0	(26)
Business Divestitures		0	0
Currency Translation and Other		(2)	(9)
Goodwill, Ending Balance		$ 1,038	$ 1,040