Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				$ 39	$ 29
2017 Restructuring Plan
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges	$ 23	$ 15		38
2017 Restructuring Plan | Corporate Segment
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				17
2017 Restructuring Plan | Building Technologies & Solutions Tyco [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				1
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			$ 15
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 [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges			$ 14