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Significant Restructuring Costs Change in Restructuring Reserve - 2018 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs $ 0 $ 0 $ 154 $ 0 $ 154  
2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           $ 263
Restructuring Reserve, Settled without Cash           (42)
Restructuring Reserve 124     124   174
Payments for Restructuring       (46)   (47)
Employee Severance | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           209
Restructuring Reserve, Settled without Cash           0
Restructuring Reserve 118     118   164
Payments for Restructuring       (42)   (45)
Fixed Asset Impairment | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           42
Restructuring Reserve, Settled without Cash           (42)
Restructuring Reserve 0     0   0
Payments for Restructuring       0   0
Other Restructuring | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           12
Restructuring Reserve, Settled without Cash           0
Restructuring Reserve $ 6     6   10
Payments for Restructuring       (4)   (2)
Global Products | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           113
Building Solutions EMEA/LA | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           56
Corporate Segment | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           50
Building Solutions Asia Pacific | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           16
Building Solutions North America | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           20
Continuing Operations | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           255
Discontinued Operations | Power Solutions | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           $ 8
Transfer To Held for Sale [Member] | Power Solutions | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve, Settled without Cash       (4)    
Transfer To Held for Sale [Member] | Power Solutions | Employee Severance | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve, Settled without Cash       (4)    
Transfer To Held for Sale [Member] | Power Solutions | Fixed Asset Impairment | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve, Settled without Cash       0    
Transfer To Held for Sale [Member] | Power Solutions | Other Restructuring | 2018 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve, Settled without Cash       $ 0