Segment Information (Details 1) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Geographic Segments
Net Sales	$ 40,833	$ 34,305	$ 28,497
Long-Lived Assets (Year-end)	5,616	4,096	3,986
United States [Member]
Geographic Segments
Net Sales	14,367	12,892	11,099
Long-Lived Assets (Year-end)	2,116	1,573	1,535
Germany [Member]
Geographic Segments
Net Sales	4,590	3,542	2,877
Long-Lived Assets (Year-end)	864	388	438
Other Foreign [Member]
Geographic Segments
Net Sales	9,795	8,105	6,239
Long-Lived Assets (Year-end)	740	600	492
Other European Countries [Member]
Geographic Segments
Net Sales	10,212	8,338	7,330
Long-Lived Assets (Year-end)	1,356	1,071	1,118
Mexico [Member]
Geographic Segments
Net Sales	1,869	1,428	952
Long-Lived Assets (Year-end)	$ 540	$ 464	$ 403