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Impairment of Long-Lived Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges   $ 78 $ 221 $ 183
2017 Restructuring Plan [Member]        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges   77    
2017 Restructuring Plan [Member] | Building Solutions Asia Pacific        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges   1    
2017 Restructuring Plan [Member] | Building Solutions North America        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges   30    
2017 Restructuring Plan [Member] | Global Products        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges   20    
2017 Restructuring Plan [Member] | Power Solutions        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges   7    
2017 Restructuring Plan [Member] | Corporate        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges   $ 19    
2016 Restructuring Plan [Member]        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges     103  
2016 Restructuring Plan [Member] | Building Solutions Asia Pacific        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges     4  
2016 Restructuring Plan [Member] | Building Solutions EMEA/LA        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges     3  
2016 Restructuring Plan [Member] | Global Products        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges     8  
2016 Restructuring Plan [Member] | Power Solutions        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges     64  
2016 Restructuring Plan [Member] | Corporate        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges     24  
2016 Restructuring Plan [Member] | Discontinued Operations | Adient        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges     $ 87  
2015 Restructuring Plan [Member]        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges $ 156      
2015 Restructuring Plan [Member] | Building Solutions EMEA/LA        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges 16      
2015 Restructuring Plan [Member] | Building Solutions North America        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges 1      
2015 Restructuring Plan [Member] | Corporate        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges 139      
2015 Restructuring Plan [Member] | Discontinued Operations | Adient        
Impairment of Long Lived Assets [Line Items]        
Asset Impairment Charges $ 27