Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Goodwill [Line Items]
Goodwill		$ 18,109
Accumulated impairment loss		(781)
Goodwill [Roll Forward]
Balance at beginning of period	$ 17,328
Acquisitions	55
Foreign currency translation and other	301
Balance at end of period	17,684
Building Solutions North America
Goodwill [Line Items]
Goodwill		9,630
Accumulated impairment loss		(659)
Goodwill [Roll Forward]
Balance at beginning of period	8,971
Acquisitions	0
Foreign currency translation and other	8
Balance at end of period	8,979
Building Solutions EMEA/LA
Goodwill [Line Items]
Goodwill		1,772
Accumulated impairment loss		(47)
Goodwill [Roll Forward]
Balance at beginning of period	1,725
Acquisitions	2
Foreign currency translation and other	139
Balance at end of period	1,866
Building Solutions Asia Pacific
Goodwill [Line Items]
Goodwill		1,116
Accumulated impairment loss		0
Goodwill [Roll Forward]
Balance at beginning of period	1,116
Acquisitions	0
Foreign currency translation and other	62
Balance at end of period	1,178
Global Products
Goodwill [Line Items]
Goodwill		5,591
Accumulated impairment loss		$ (75)
Goodwill [Roll Forward]
Balance at beginning of period	5,516
Acquisitions	53
Foreign currency translation and other	92
Balance at end of period	$ 5,661