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Significant Restructuring Costs Change in Restructuring Reserve - 2018 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs $ 0   $ 158 $ 49 $ 99 $ 78 $ 158 $ 226
2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs     158       158  
Restructuring Reserve, Settled without Cash     (30)          
Restructuring Reserve 106 $ 119 128       106  
Payments for Restructuring (13) (9)            
Employee Severance | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs     125          
Restructuring Reserve, Settled without Cash     0          
Restructuring Reserve 105 117 125       105  
Payments for Restructuring (12) (8)            
Fixed Asset Impairment | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs     30          
Restructuring Reserve, Settled without Cash     (30)          
Restructuring Reserve 0 0 0       0  
Payments for Restructuring 0 0            
Other Restructuring | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs     3          
Restructuring Reserve, Settled without Cash     0          
Restructuring Reserve 1 2 $ 3       1  
Payments for Restructuring $ (1) $ (1)            
Global Products | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs             76  
Building Solutions EMEA/LA | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs             32  
Corporate Segment | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs             24  
Building Solutions Asia Pacific | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs             14  
Building Solutions North America | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs             8  
Power Solutions | 2018 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs             $ 4