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Impairment of Long-Lived Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges           $ 70 $ 80
2017 Restructuring Plan              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges $ 31 $ 23 $ 15     69  
2017 Restructuring Plan | Buildings Tyco [Member]              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges           27  
2017 Restructuring Plan | Corporate Segment              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges           17  
2017 Restructuring Plan | Building Efficiency Systems and Service North America              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges           1  
2017 Restructuring Plan | Power Solutions              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges           4  
2017 Restructuring Plan | Building Efficiency Products North America [Member]              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges           $ 20  
2016 Restructuring Plan [Member]              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges       $ 50 $ 15   65
2016 Restructuring Plan [Member] | Corporate Segment              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges             50
2016 Restructuring Plan [Member] | Building Efficiency Asia              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges             4
2016 Restructuring Plan [Member] | Building Efficiency Products North America [Member]              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges             8
2016 Restructuring Plan [Member] | Building Efficiency Rest of World [Member]              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges             3
Discontinued Operations | 2016 Restructuring Plan [Member] | Adient              
Impairment of Long Lived Assets [Line Items]              
Asset Impairment Charges             $ 15