Segment Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2011 Plan Business Segment Entity Person Age Plant lb MetricTon	Sep. 30, 2010 Person Acquisition MetricTon lb	Sep. 30, 2009 Acquisition Person
Financial information related to Company's reportable segments
Net Sales	$ 40,833	$ 34,305	$ 28,497
Segment Income (Loss)	2,285	1,933	262
Net financing charges	(174)	(170)	(239)
Debt conversion costs			(111)
Restructuring costs			(230)
Income (loss) before income taxes	2,111	1,763	(318)
Assets	29,676	25,743	24,088
Depreciation/Amortization	731	691	745
Capital Expenditures	1,325	777	647
Segment Information (Textuals)
Number of reportable segments	9
Restructuring costs			(230)
Equity income (loss) included in segment income	298	254	(77)
Number of primary businesses	3
Number of customers that individually accounted for 10% or more of consolidated net sales	0	0	0
Percentage of individual customer sales to consolidated net sales threshold for disclosure as major customer	10.00%	10.00%	10.00%
North America systems [Member] \| Building Efficiency [Member]
Financial information related to Company's reportable segments
Net Sales	2,343	2,142	2,222
Segment Income (Loss)	239	206	259
Assets	1,300	1,354	1,301
Depreciation/Amortization	10	11	9
Capital Expenditures	6	14	12
North America service [Member] \| Building Efficiency [Member]
Financial information related to Company's reportable segments
Net Sales	2,305	2,127	2,168
Segment Income (Loss)	113	117	188
Assets	1,581	1,511	1,481
Depreciation/Amortization	25	23	19
Capital Expenditures	17	32	55
Segment Information (Textuals)
Equity income (loss) included in segment income	2
Global workplace solutions [Member] \| Building Efficiency [Member]
Financial information related to Company's reportable segments
Net Sales	4,153	3,288	2,832
Segment Income (Loss)	16	40	58
Restructuring costs			1
Assets	1,228	1,012	860
Depreciation/Amortization	18	16	13
Capital Expenditures	32	17	9
Segment Information (Textuals)
Restructuring costs			1
Building Efficiency [Member]
Financial information related to Company's reportable segments
Net Sales	14,893	12,802	12,493
Segment Income (Loss)	716	673	397
Assets	9,471	9,038	8,489
Depreciation/Amortization	137	138	134
Capital Expenditures	168	119	132
Segment Information (Textuals)
Number of reportable segments prior to reorganization	6
Number of reportable segments	5
Building Efficiency [Member] \| Asia [Member]
Financial information related to Company's reportable segments
Net Sales	1,840	1,422	1,293
Segment Income (Loss)	249	178	170
Restructuring costs			2
Assets	1,247	1,236	1,014
Depreciation/Amortization	15	15	14
Capital Expenditures	22	13	12
Segment Information (Textuals)
Restructuring costs			2
Equity income (loss) included in segment income	3	2	1
Building Efficiency [Member] \| Other [Member]
Financial information related to Company's reportable segments
Net Sales	4,252	3,823	3,978
Segment Income (Loss)	99	132	(278)
Restructuring costs			21
Assets	4,115	3,925	3,833
Depreciation/Amortization	69	73	79
Capital Expenditures	91	43	44
Segment Information (Textuals)
Restructuring costs			21
Equity income (loss) included in segment income	17	2	(153)
Automotive Experience [Member]
Financial information related to Company's reportable segments
Net Sales	20,065	16,610	12,016
Segment Income (Loss)	761	591	(541)
Assets	12,798	10,127	9,732
Depreciation/Amortization	419	391	450
Capital Expenditures	638	386	369
Automotive Experience [Member] \| Asia [Member]
Financial information related to Company's reportable segments
Net Sales	2,367	1,826	1,098
Segment Income (Loss)	243	107	4
Restructuring costs			23
Assets	1,587	1,345	1,087
Depreciation/Amortization	27	31	32
Capital Expenditures	45	38	30
Segment Information (Textuals)
Restructuring costs			23
Equity income (loss) included in segment income	187	132	70
Automotive Experience [Member] \| North America [Member]
Financial information related to Company's reportable segments
Net Sales	7,431	6,765	4,631
Segment Income (Loss)	404	379	(333)
Restructuring costs			47
Assets	3,863	3,392	3,259
Depreciation/Amortization	138	147	198
Capital Expenditures	210	123	104
Segment Information (Textuals)
Restructuring costs			47
Equity income (loss) included in segment income	20	14	(14)
Automotive Experience [Member] \| Europe [Member]
Financial information related to Company's reportable segments
Net Sales	10,267	8,019	6,287
Segment Income (Loss)	114	105	(212)
Restructuring costs			86
Assets	7,348	5,390	5,386
Depreciation/Amortization	254	213	220
Capital Expenditures	383	225	235
Segment Information (Textuals)
Restructuring costs			86
Equity income (loss) included in segment income	7	7	(3)
Power Solutions [Member]
Financial information related to Company's reportable segments
Net Sales	5,875	4,893	3,988
Segment Income (Loss)	808	669	406
Restructuring costs			50
Assets	6,638	5,478	4,278
Depreciation/Amortization	175	162	161
Capital Expenditures	519	272	146
Segment Information (Textuals)
Restructuring costs			50
Equity income (loss) included in segment income	62	97	22
Unallocated [Member]
Financial information related to Company's reportable segments
Assets	$ 769	$ 1,100	$ 1,589

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