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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended				12 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Intangible Assets [Line Items]
Goodwill, impaired, accumulated impairment loss	$ 781,000,000				$ 781,000,000	$ 471,000,000	$ 471,000,000
Goodwill impairment loss					310,000,000	0	0
Goodwill	17,328,000,000				17,328,000,000	18,335,000,000	17,932,000,000
Impairment of intangible assets, indefinite-lived				$ 62,000,000	0	0	0
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]				Restructuring and impairment costs
Amortization of intangible assets					427,000,000	435,000,000	386,000,000
Building Solutions North America
Intangible Assets [Line Items]
Goodwill, impaired, accumulated impairment loss	659,000,000				659,000,000	424,000,000	424,000,000
Goodwill impairment loss					235,000,000	0
Goodwill	8,971,000,000				8,971,000,000	9,215,000,000	9,160,000,000
Global Products
Intangible Assets [Line Items]
Goodwill, impaired, accumulated impairment loss	75,000,000				75,000,000
Goodwill impairment loss					75,000,000	0
Goodwill	5,516,000,000				5,516,000,000	5,842,000,000	5,562,000,000
Building Solutions EMEA/LA
Intangible Assets [Line Items]
Goodwill, impaired, accumulated impairment loss	47,000,000				47,000,000	47,000,000	47,000,000
Goodwill impairment loss					0	0
Goodwill	1,725,000,000				1,725,000,000	2,041,000,000	$ 1,987,000,000
Silent-Aire
Intangible Assets [Line Items]
Goodwill impairment loss	75,000,000
Goodwill	183,000,000				183,000,000
North America Retail
Intangible Assets [Line Items]
Goodwill impairment loss		$ 235,000,000	$ 424,000,000
Goodwill	0				0	$ 235,000,000
Asia Pacific Subscriber Business
Intangible Assets [Line Items]
Indefinite-lived trademarks	$ 54,000,000				$ 54,000,000

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Intangible Assets [Line Items]

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit.

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