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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, 2018
Dec. 31, 2017
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]      
Restructuring and impairment costs $ 0 $ 154  
2018 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring and impairment costs     $ 263
Restructuring Reserve, Settled without Cash     (42)
Restructuring Reserve 155   174
Payments for Restructuring (15)   (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 148   164
Payments for Restructuring (12)   (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
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 7   10
Payments for Restructuring (3)   (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