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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Jul. 31, 2023
Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment loss |  | $ 184,000,000 | $ 310,000,000 |  |
Goodwill | $ 17,936,000,000 | 17,936,000,000 | 17,350,000,000 | $ 18,335,000,000 |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] | Restructuring Costs and Asset Impairment Charges |  |  |  |
Indefinite-lived trademarks | $ 412,000,000 | 412,000,000 |  |  |
Amortization of intangible assets |  | 439,000,000 | 427,000,000 | 435,000,000 |
Global Products |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets, finite-lived | 18,000,000 |  |  |  |
Building Solutions Asia Pacific |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment loss |  | 0 | 0 |  |
Goodwill | 1,179,000,000 | 1,179,000,000 | 1,116,000,000 | $ 1,237,000,000 |
Impairment of intangible assets, indefinite-lived | 10,000,000 |  |  |  |
Silent-Aire |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment loss |  | 184,000,000 | 75,000,000 |  |
Goodwill | 0 | 0 |  |  |
Reporting Unit with Fair Value Exceeding Carrying Value by 10% |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 455,000,000
Fair value in excess of carrying value percentage |  |  |  |  | 10.00%
Reporting Unit with Fair Value Exceeding Carrying Value by 10% | Measurement Input, Discount Rate |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Increase (decrease) in measurement input |  |  |  |  | 1.00%
Reporting Unit with Fair Value Exceeding Carrying Value by 10% | Measurement Input, Long-Term Revenue Growth Rate |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Increase (decrease) in measurement input |  |  |  |  | 1.50%
North America Retail |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment loss |  |  | 235,000,000 |  |
Goodwill | $ 0 | $ 0 | $ 0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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