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Significant Restructuring Costs Change in Restructuring Reserve - 2018 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs $ 111 $ 0    
2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       $ 263
Payments for Restructuring (5)   $ (67) (47)
Restructuring Reserve, Settled without Cash 2   (1) (42)
Restructuring Reserve 95   102 174
Employee Severance | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       209
Payments for Restructuring (5)   (61) (45)
Restructuring Reserve, Settled without Cash 0   0 0
Restructuring Reserve 94   99 164
Fixed Asset Impairment | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       42
Payments for Restructuring 0   0 0
Restructuring Reserve, Settled without Cash 0   0 (42)
Restructuring Reserve 0   0 0
Other Restructuring | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       12
Payments for Restructuring 0   (6) (2)
Restructuring Reserve, Settled without Cash 0   0 0
Restructuring Reserve 0   4 10
Currency Translation | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       0
Payments for Restructuring 0   0 0
Restructuring Reserve, Settled without Cash (2)   (1) 0
Restructuring Reserve 1   (1) 0
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  
Transfer To Held for Sale [Member] | Power Solutions | Currency Translation | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash     $ 0  
Adoption of ASC 842 | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Adoption of ASC 842 (4)      
Adoption of ASC 842 | Employee Severance | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Adoption of ASC 842 0      
Adoption of ASC 842 | Fixed Asset Impairment | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Adoption of ASC 842 0      
Adoption of ASC 842 | Other Restructuring | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Adoption of ASC 842 (4)      
Adoption of ASC 842 | Currency Translation | 2018 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Adoption of ASC 842 $ 0