Acquisitions and Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended					3 Months Ended	12 Months Ended							3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2011	Sep. 30, 2013 Divestiture Acquisition	Sep. 30, 2012 Acquisition Divestiture	Sep. 30, 2011 Divestiture	Sep. 30, 2013 Power Solutions	Sep. 30, 2012 Power Solutions	Sep. 30, 2011 Keiper/Recaro Automotive Acquisition	Sep. 30, 2012 Keiper/Recaro Automotive Acquisition	Sep. 30, 2011 Keiper/Recaro Automotive Acquisition	Sep. 30, 2012 Hammerstein Acquisition	Sep. 30, 2011 Hammerstein Acquisition	Sep. 30, 2012 2011 Additional acquisitions	Sep. 30, 2011 2011 Additional acquisitions Acquisition	Sep. 30, 2012 Purchase Price	Dec. 31, 2011 Purchase Price True-Up	Sep. 30, 2013 Seating and Building Efficiency Other [Member]	Sep. 30, 2013 Seating Automotive Experience	Sep. 30, 2012 Seating Automotive Experience	Sep. 30, 2013 Building Efficiency Other Building Efficiency	Sep. 30, 2012 Building Efficiency Other Building Efficiency
Acquisitions And Discontinued Operations [Line Items]
Number of acquisitions			3	3										5
Acquisition of businesses, net of cash acquired			$ 123	$ 30	$ 1,226			$ 442		$ 450		$ 529		$ 115	$ 38	$ (8)
Goodwill recorded in connection with business acquisitions			266	79	100	0	45			128		200		119				187	34	0	0
Number of acquisitions which increased Company's ownership from noncontrolling to controlling interest			2	2										1
Aggregate non-cash gain recorded due to acquisition		75	106	12	89		9							14					3
Sales price of divestiture	701		761	105	0												60
Gain on business divestitures - net	476		483	40	0													29		(22)
Goodwill written off related to sale of business unit	177		266	34		0	0											15	0	0	32
Number of divestitures			2	3	0
Percentage of interest acquired		49.00%			49.00%
Total ownership percentage		100.00%			100.00%
Purchase price of acquisition already paid		143
Cash acquired for acquisition		11
Acquisition costs and related purchase accounting adjustments		15			15
Goodwill adjustment				$ 6					$ 2		$ 7		$ 14