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Goodwill and Other Intangible Assets (Details) (USD $)
In Millions
3 Months Ended 9 Months Ended
Jun. 30, 2011
Sep. 30, 2010
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   $ 6,217   $ 6,501  
Business Acquisitions   59   436  
Currency Translation and Other   225   156  
Goodwill, Ending Balance 7,093 6,501 6,217 7,093 6,217
Other Intangible Assets          
Gross Carrying Amount, Total Amortized Intangible Assets 840 718 673 840 673
Accumulated Amortization (335) (292) (272) (335) (272)
Net, Total Amortized Intangible Assets 505 426 401 505 401
Gross Carrying Amount, Total Intangible Assets 1,157 1,033 967 1,157 967
Net, Total Intangible Assets 822 741 695 822 695
Goodwill and Other Intangible Assets (Textuals)          
Amortization of other intangible assets 13   10 36 32
Future amortization expense, 2012       46  
Future amortization expense, 2013       40  
Future amortization expense, 2014       38  
Future amortization expense, 2015       36  
Future amortization expense, 2016       33  
Building Efficiency [Member] | Other [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   1,035   1,085  
Currency Translation and Other   50   36  
Goodwill, Ending Balance 1,121 1,085   1,121  
Building Efficiency [Member] | Asia [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   368   379  
Currency Translation and Other   11   12  
Goodwill, Ending Balance 391 379   391  
Building Efficiency [Member] | North America systems [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   526   522  
Currency Translation and Other   (4)   (3)  
Goodwill, Ending Balance 519 522   519  
Building Efficiency [Member] | North America service [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   672      
Business Acquisitions   4      
Goodwill, Ending Balance 676 676   676  
Building Efficiency [Member] | Global workplace solutions [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   169   177  
Currency Translation and Other   8   7  
Goodwill, Ending Balance 184 177   184  
Automotive Experience [Member] | Europe [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   1,022   1,140  
Business Acquisitions   4   429  
Currency Translation and Other   114   70  
Goodwill, Ending Balance 1,639 1,140   1,639  
Automotive Experience [Member] | North America [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   1,377   1,378  
Business Acquisitions       4  
Currency Translation and Other   1      
Goodwill, Ending Balance 1,382 1,378   1,382  
Automotive Experience [Member] | Asia [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   218   233  
Currency Translation and Other   15   10  
Goodwill, Ending Balance 243 233   243  
Power Solutions [Member]
         
Changes in carrying amount of goodwill          
Goodwill, Beginning Balance   830   911  
Business Acquisitions   51   3  
Currency Translation and Other   30   24  
Goodwill, Ending Balance 938 911   938  
Patented Technology [Member]
         
Other Intangible Assets          
Gross Carrying Amount, Total Amortized Intangible Assets 287 277 266 287 266
Accumulated Amortization (215) (191) (180) (215) (180)
Net, Total Amortized Intangible Assets 72 86 86 72 86
Customer Relationships [Member]
         
Other Intangible Assets          
Gross Carrying Amount, Total Amortized Intangible Assets 440 373 344 440 344
Accumulated Amortization (85) (70) (64) (85) (64)
Net, Total Amortized Intangible Assets 355 303 280 355 280
Miscellaneous [Member]
         
Other Intangible Assets          
Gross Carrying Amount, Total Amortized Intangible Assets 113 68 63 113 63
Accumulated Amortization (35) (31) (28) (35) (28)
Net, Total Amortized Intangible Assets 78 37 35 78 35
Trademarks [Member]
         
Other Intangible Assets          
Gross Carrying Amount and Net $ 317 $ 315 $ 294 $ 317 $ 294