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Significant Restructuring Costs Change in Restructuring Reserve - 2017 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs $ 49 $ 99 $ 78 $ 27 $ 60 $ 226 $ 87  
2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs 49 99 78          
Payments for Restructuring (34) (13)            
Restructuring Reserve, Settled without Cash (32) (23) (16)          
Restructuring Reserve 108 125 62     108    
Employee Severance | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs 16 67 62          
Payments for Restructuring (34) (13)            
Restructuring Reserve, Settled without Cash 0 0 0          
Restructuring Reserve 98 116 62     98    
Fixed Asset Impairment | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs 31 23 15          
Payments for Restructuring 0 0            
Restructuring Reserve, Settled without Cash (31) (23) (15)          
Restructuring Reserve 0 0 0     0    
Other Restructuring | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs 2 9 1          
Payments for Restructuring 0 0            
Restructuring Reserve, Settled without Cash (1) 0 (1)          
Restructuring Reserve 10 9 0     10    
Continuing Operations | 2016 Restructuring Plan [Domain]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs               $ 288
Continuing Operations | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs $ 49 $ 99 $ 78     226    
Continuing Operations | Corporate Segment | 2016 Restructuring Plan [Domain]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs               161
Continuing Operations | Corporate Segment | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs           79    
Continuing Operations | Building Efficiency Asia | 2016 Restructuring Plan [Domain]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs               26
Continuing Operations | Building Efficiency Asia | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs           9    
Continuing Operations | Power Solutions | 2016 Restructuring Plan [Domain]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs               66
Continuing Operations | Power Solutions | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs           4    
Continuing Operations | Building Efficiency Systems and Service North America | 2016 Restructuring Plan [Domain]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs               2
Continuing Operations | Building Efficiency Systems and Service North America | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs           14    
Continuing Operations | Building Technologies & Solutions Tyco [Member] | 2016 Restructuring Plan [Domain]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs               8
Continuing Operations | Building Technologies & Solutions Tyco [Member] | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs           73    
Continuing Operations | Building Efficiency Products North America [Member] | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs           27    
Continuing Operations | Building Efficiency Rest of World [Member] | 2016 Restructuring Plan [Domain]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs               $ 16
Continuing Operations | Building Efficiency Rest of World [Member] | 2017 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring and impairment costs           $ 20