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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs $ 96 $ 62   $ 96 $ 173  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)           $ 62
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     $ 111     297
Payments for Restructuring       (48)   (95)
Restructuring Reserve, Settled without Cash           (96)
Currency Translation           2
Restructuring Reserve 60     60   108
Employee Severance | 2020 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs           196
Payments for Restructuring       (46)   (92)
Restructuring Reserve, Settled without Cash           0
Currency Translation           2
Restructuring Reserve 60     60   106
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
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
Restructuring Reserve $ 0     $ 0   2
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