Goodwill and Other Intangible Assets (Details) (USD $) In Millions	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	$ 6,501	$ 6,542
Business Acquisitions	518	64
Currency Translation and Other	(3)	(105)
Goodwill, Ending Balance	7,016	6,501	6,542
Other Intangible Assets
Gross Carrying Amount, Total Amortized Intangible Assets	969	718
Accumulated Amortization	(338)	(292)
Net, Total Amortized Intangible Assets	631	426
Gross Carrying Amount, Total Intangible Assets	1,283	1,033
Net, Total Intangible Assets	945	741
Goodwill and Other Intangible Assets (Textuals)
Amortization of other intangible assets	53	43	38
Future amortization expense, 2012	61
Future amortization expense, 2013	54
Future amortization expense, 2014	54
Future amortization expense, 2015	51
Future amortization expense, 2016	46
Europe [Member] \| Automotive Experience [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	1,140	1,211
Business Acquisitions	371	5
Currency Translation and Other	(8)	(76)
Goodwill, Ending Balance	1,503	1,140
Other [Member] \| Building Efficiency [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	1,085	1,116
Currency Translation and Other	(20)	(31)
Goodwill, Ending Balance	1,065	1,085
North America [Member] \| Automotive Experience [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	1,378	1,376
Business Acquisitions	2
Currency Translation and Other	(1)	2
Goodwill, Ending Balance	1,379	1,378
Asia [Member] \| Building Efficiency [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	379	369
Currency Translation and Other	12	10
Goodwill, Ending Balance	391	379
Asia [Member] \| Automotive Experience [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	233	223
Business Acquisitions	16
Currency Translation and Other	12	10
Goodwill, Ending Balance	261	233
North America systems [Member] \| Building Efficiency [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	522	525
Currency Translation and Other	(3)	(3)
Goodwill, Ending Balance	519	522
North America service [Member] \| Building Efficiency [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	676	668
Business Acquisitions	33	8
Currency Translation and Other	1
Goodwill, Ending Balance	710	676
Global workplace solutions [Member] \| Building Efficiency [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	177	174
Currency Translation and Other	7	3
Goodwill, Ending Balance	184	177
Power Solutions [Member]
Changes in carrying amount of goodwill
Goodwill, Beginning Balance	911	880
Business Acquisitions	96	51
Currency Translation and Other	(3)	(20)
Goodwill, Ending Balance	1,004	911
Patented Technology [Member]
Other Intangible Assets
Gross Carrying Amount, Total Amortized Intangible Assets	298	277
Accumulated Amortization	(209)	(191)
Net, Total Amortized Intangible Assets	89	86
Customer Relationships [Member]
Other Intangible Assets
Gross Carrying Amount, Total Amortized Intangible Assets	487	373
Accumulated Amortization	(91)	(70)
Net, Total Amortized Intangible Assets	396	303
Miscellaneous [Member]
Other Intangible Assets
Gross Carrying Amount, Total Amortized Intangible Assets	184	68
Accumulated Amortization	(38)	(31)
Net, Total Amortized Intangible Assets	146	37
Trademarks [Member]
Other Intangible Assets
Gross Carrying Amount and Net	$ 314	$ 315

Goodwill and Other Intangible Assets.

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Sum of the gross carrying amounts of all intangible assets (finite-lived and indefinite-lived), excluding goodwill, as of the balance sheet date, before accumulated amortization and impairment charges for finite-lived intangible assets.

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Other Intangible Assets.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

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