Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 22,525	$ 21,069
Accumulated Amortization	(11,654)	(10,168)
Finite-Lived Intangible Assets, Net	10,871	10,901
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	15,827	15,080
Accumulated Amortization	(8,094)	(7,023)
Finite-Lived Intangible Assets, Net	7,733	8,058
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,513	4,859
Accumulated Amortization	(2,878)	(2,521)
Finite-Lived Intangible Assets, Net	2,635	2,338
Patents, trademarks and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,185	1,130
Accumulated Amortization	(682)	(624)
Finite-Lived Intangible Assets, Net	$ 503	$ 505