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Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 20,287 | $ 20,122
Accumulated Amortization | (8,067) | (7,385)
Net Carrying Amount | 12,220 | 12,737
Unamortized intangible assets | 46 | 46
Acquired in-process research and development |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized intangible assets | 44 | 44
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized intangible assets | 2 | 2
Developed technology |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,535 | 14,399
Accumulated Amortization | (5,491) | (4,983)
Net Carrying Amount | 9,044 | 9,417
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,686 | 4,658
Accumulated Amortization | (2,005) | (1,839)
Net Carrying Amount | 2,681 | 2,818
Product rights |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 115 | 123
Accumulated Amortization | (82) | (83)
Net Carrying Amount | 33 | 40
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 408 | 409
Accumulated Amortization | (146) | (137)
Net Carrying Amount | 262 | 271
Patents and other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 543 | 533
Accumulated Amortization | (343) | (342)
Net Carrying Amount | $ 200 | $ 191

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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