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Significant Restructuring Costs Change in Restructuring Reserve - 2017 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs $ 62 $ 0 $ 173 $ 0      
2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             $ 367
Payments for Restructuring     (25)   $ (13) $ (158) (75)
Restructuring Reserve, Settled without Cash         (3) (1) (78)
Adjustment to restructuring reserves             25
Restructuring Reserve 31   31   61 80 239
Employee Severance | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             276
Payments for Restructuring     (25)   (11) (152) (75)
Restructuring Reserve, Settled without Cash         0 0 0
Adjustment to restructuring reserves             25
Restructuring Reserve 35   35   60 74 226
Long-Lived Asset Impairment | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             77
Payments for Restructuring     0   0 0 0
Restructuring Reserve, Settled without Cash         0 0 (77)
Adjustment to restructuring reserves             0
Restructuring Reserve 0   0   0 0 0
Other Restructuring | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             14
Payments for Restructuring     0   (2) (6) 0
Restructuring Reserve, Settled without Cash         0 0 (1)
Adjustment to restructuring reserves             0
Restructuring Reserve 0   0   5 7 13
Currency Translation | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             0
Payments for Restructuring     0   0 0 0
Restructuring Reserve, Settled without Cash         (3) (1) 0
Adjustment to restructuring reserves             0
Restructuring Reserve $ (4)   (4)   (4) $ (1) 0
Corporate Segment | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             166
Building Technologies & Solutions EMEA LA [Member] | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             74
Building Solutions North America | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             59
Building Solutions Asia Pacific | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             16
Global Products | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             32
Continuing Operations | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             347
Power Solutions | Transfer To Held for Sale [Member] | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Settled without Cash         (3)    
Power Solutions | Transfer To Held for Sale [Member] | Employee Severance | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Settled without Cash         (3)    
Power Solutions | Transfer To Held for Sale [Member] | Long-Lived Asset Impairment | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Settled without Cash         0    
Power Solutions | Transfer To Held for Sale [Member] | Other Restructuring | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Settled without Cash         0    
Power Solutions | Transfer To Held for Sale [Member] | Currency Translation | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Settled without Cash         $ 0    
Power Solutions | Discontinued Operations | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             $ 20
Accounting Standards Update 2016-02 [Member] | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Translation and Other Adjustment     (5)        
Accounting Standards Update 2016-02 [Member] | Employee Severance | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Translation and Other Adjustment     0        
Accounting Standards Update 2016-02 [Member] | Long-Lived Asset Impairment | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Translation and Other Adjustment     0        
Accounting Standards Update 2016-02 [Member] | Other Restructuring | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Translation and Other Adjustment     (5)        
Accounting Standards Update 2016-02 [Member] | Currency Translation | 2017 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Translation and Other Adjustment     $ 0