Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended			24 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2020
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges			$ 582	$ 235	$ 36
Impairment of Long-Lived Assets Held-for-use			$ 81
Document Period End Date			Sep. 30, 2020
Building Solutions Asia Pacific
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			$ 24
Building Solutions North America
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			15
Global Products
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 15	$ 235		$ 235		$ 250
Impairment of Long-Lived Assets Held-for-use			$ 42
2018 Restructuring Plan [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					36
2018 Restructuring Plan [Member] | Global Products
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					31
2018 Restructuring Plan [Member] | Power Solutions
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					6
2018 Restructuring Plan [Member] | Corporate
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					$ 5