Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Mar. 31, 2017
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				$ 30	$ 39
2018 Restructuring Plan
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges	$ 30
2018 Restructuring Plan | Global Products
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges	23
2018 Restructuring Plan | Corporate Segment
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges	5
2018 Restructuring Plan | Power Solutions
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges	$ 2
2017 Restructuring Plan
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges		$ 23	$ 15		38
2017 Restructuring Plan | Global Products
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					20
2017 Restructuring Plan | Corporate Segment
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					17
2017 Restructuring Plan | Building Solutions North America
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					$ 1