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Assets and Liabilities Held For Sale & Discontinued Operations - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment loss		$ 310,000,000	$ 0	$ 0
Impairment of intangible assets, finite-lived		$ 38,000,000
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]		Restructuring and impairment costs
Asset impairment charges		$ 555,000,000	98,000,000	582,000,000
Income from discontinued operations		0	124,000,000	$ 0
Building Solutions North America Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment loss		235,000,000
Building Solutions Asia Pacific
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment loss		0	$ 0
Asset impairment charges		45,000,000
Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations	$ 124,000,000
Tax effect of discontinued operation	$ 26,000,000
Business Divestitures, Not Specific | Building Solutions Asia Pacific
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, not discontinued operation, loss (gain) on write-down		60,000,000
Global Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, not discontinued operation, loss (gain) on write-down		$ 86,000,000

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