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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details)
$ in Millions
 3 Months Ended 12 Months Ended 15 Months Ended
Dec. 31, 2020
USD ($)
Employees
Dec. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Employees
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs $ 0 $ 111    
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 62  
Number of employees to be severed | Employees       6,500
Number of employees severed | Employees 4,700     4,700
Building Solutions North America Retail [Member]        
Restructuring Cost and Reserve [Line Items]        
Goodwill, Impairment Loss     424  
2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     297  
Payments for Restructuring $ (28)   (95)  
Restructuring Reserve, Settled without Cash     (96)  
Currency Translation 1   2  
Restructuring Reserve 81   108 $ 81
Employee Severance | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     196  
Payments for Restructuring (26)   (92)  
Restructuring Reserve, Settled without Cash     0  
Currency Translation 1   2  
Restructuring Reserve 81   106 81
Long-Lived Asset Impairment | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     96  
Payments for Restructuring 0   0  
Restructuring Reserve, Settled without Cash     (96)  
Currency Translation 0   0  
Restructuring Reserve 0   0 0
Other Restructuring | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     5  
Payments for Restructuring (2)   (3)  
Restructuring Reserve, Settled without Cash     0  
Currency Translation 0   0  
Restructuring Reserve $ 0   2 $ 0
Global Products | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     136  
Building Solutions North America | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     64  
Building Solutions Asia Pacific | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     49  
Building Solutions EMEA/LA | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     43  
Corporate Segment | 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     $ 5