Significant Restructuring and Impairment Costs - Schedule of Restructuring Reserve by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Total	$ 345	$ 49
Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Total	57
Building Solutions North America | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Total	2
Building Solutions EMEA/LA | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Total	21
Building Solutions Asia Pacific | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Total	5
Global Products | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Total	23
Corporate | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Total	$ 6