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Goodwill and Other Intangible Assets
 6 Months Ended
Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The changes in the carrying amount of goodwill in each of the Company’s reportable segments were as follows (in millions):

Six Months Ended March 31, 2023
Building Solutions North AmericaBuilding Solutions EMEA/LABuilding Solutions Asia PacificGlobal ProductsTotal
Goodwill$9,630 $1,772 $1,116 $5,591 18,109 
Accumulated impairment loss(659)(47)— (75)(781)
Balance at beginning of period8,971 1,725 1,116 5,516 17,328 
Acquisitions (1)
— 16 — 53 69 
Impairments— — — (184)(184)
Foreign currency translation and other8 183 53 102 346 
Balance at end of period$8,979 $1,924 $1,169 $5,487 $17,559 
(1) Includes measurement period adjustments

The Company tests goodwill for impairment annually as of July 31 or more frequently if events or changes in circumstances indicate the asset might be impaired. In the second quarter of fiscal 2023, management completed an updated comprehensive review of the Silent-Aire reporting unit, including its current quarter results and its nearer term
forecast. Due to current quarter results being lower than its business plan, and the nearer term forecast being revised to reflect lower margins and earnings, the Company determined a triggering event had occurred and a quantitative test of goodwill for possible impairment was necessary. As a result of the goodwill impairment test, the Company recorded a non-cash impairment charge of $184 million within restructuring and impairment costs in the consolidated statements of income in the second quarter of fiscal 2023, which was determined by comparing the carrying amount of the reporting unit to its fair value. The Silent-Aire reporting unit has no remaining goodwill balance as of March 31, 2023. The Company used a discounted cash flow model to estimate the fair value of the reporting unit. The primary assumptions used in the model were management's internal projections of future cash flows, the weighted-average cost of capital and the long-term growth rate, which are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." There were no other triggering events requiring an impairment assessment be conducted in the six months ended March 31, 2023. However, it is possible that future changes in circumstances would require the Company to record additional non-cash impairment charges.

The Company’s other intangible assets, primarily from business acquisitions, consisted of (in millions):
 March 31, 2023September 30, 2022
 Gross
Carrying
Amount		Accumulated
Amortization		NetGross
Carrying
Amount		Accumulated
Amortization		Net
Definite-lived intangible assets
Technology$1,422 $(733)$689 $1,353 $(658)$695 
Customer relationships2,810 (1,393)1,417 2,742 (1,254)1,488 
Miscellaneous799 (402)397 756 (386)370 
5,031 (2,528)2,503 4,851 (2,298)2,553 
Indefinite-lived intangible assets
Trademarks/trade names2,130 — 2,130 2,088 — 2,088 
2,130 — 2,130 2,088 — 2,088 
Total intangible assets$7,161 $(2,528)$4,633 $6,939 $(2,298)$4,641 

Amortization of other intangible assets for the three-month periods ended March 31, 2023 and 2022 was $104 million and $106 million, respectively. Amortization of other intangible assets for the six month periods ended March 31, 2023 and 2022 was $208 million and $224 million, respectively.

The Company tests indefinite-lived intangible assets for impairment annually as of July 31 or more frequently if events or changes in circumstances indicate the asset might be impaired. There were no triggering events requiring that an impairment assessment be conducted in the six months ended March 31, 2023. However, it is possible that future changes in circumstances would require the Company to record additional non-cash impairment charges.