Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,787	$ 7,723
Total Intangible Assets, Net	5,505	5,549
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	5,382	5,311
Accumulated Amortization	(2,282)	(2,174)
Total Definite-Lived Intangible Assets, Net	3,100	3,137
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,405	2,412
Technology
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,505	1,464
Accumulated Amortization	(661)	(629)
Total Definite-Lived Intangible Assets, Net	844	835
Customer Relationships
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	3,105	3,097
Accumulated Amortization	(1,244)	(1,191)
Total Definite-Lived Intangible Assets, Net	1,861	1,906
Miscellaneous
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	772	750
Accumulated Amortization	(377)	(354)
Total Definite-Lived Intangible Assets, Net	395	396
Trademarks/trade names
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,325	2,332
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 80	$ 80