Segment Information Geographic Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Geographic Area Information [Line Items]
Net sales	$ 23,668	$ 22,317	$ 23,968
Long-Lived Assets (Year-end)	3,228	3,059	3,348
United States
Geographic Area Information [Line Items]
Net sales	11,577	11,371	11,973
Long-Lived Assets (Year-end)	1,638	1,713	1,824
Europe
Geographic Area Information [Line Items]
Net sales	4,069	3,523	3,697
Long-Lived Assets (Year-end)	436	278	261
Asia Pacific
Geographic Area Information [Line Items]
Net sales	5,748	5,285	5,888
Long-Lived Assets (Year-end)	727	667	866
Other Foreign
Geographic Area Information [Line Items]
Net sales	2,274	2,138	2,410
Long-Lived Assets (Year-end)	$ 427	$ 401	$ 397