Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,090	$ 6,985
Net, Total Intangible Assets	5,356	5,632
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,762	4,613
Accumulated Amortization	(1,734)	(1,353)
Net, Total Amortized Intangible Assets	3,028	3,260
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,328	2,372
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,332	1,307
Accumulated Amortization	(497)	(370)
Net, Total Amortized Intangible Assets	835	937
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,773	2,722
Accumulated Amortization	(969)	(759)
Net, Total Amortized Intangible Assets	1,804	1,963
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	657	584
Accumulated Amortization	(268)	(224)
Net, Total Amortized Intangible Assets	389	360
Trademarks
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,248	2,282
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 80	$ 90