Segment Information Geographic Segments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Geographic Area Information [Line Items]
Net Sales	$ 42,730	$ 41,955	$ 40,833
Long-Lived Assets (Year-end)	6,585	6,440	5,616
United States
Geographic Area Information [Line Items]
Net Sales	16,681	15,484	14,367
Long-Lived Assets (Year-end)	2,551	2,521	2,116
Germany
Geographic Area Information [Line Items]
Net Sales	4,730	4,790	4,590
Long-Lived Assets (Year-end)	1,057	879	864
Mexico
Geographic Area Information [Line Items]
Net Sales	2,330	2,189	1,869
Long-Lived Assets (Year-end)	560	588	540
Other European Countries
Geographic Area Information [Line Items]
Net Sales	9,943	10,663	10,212
Long-Lived Assets (Year-end)	1,439	1,557	1,356
Other Foreign
Geographic Area Information [Line Items]
Net Sales	9,046	8,829	9,795
Long-Lived Assets (Year-end)	$ 978	$ 895	$ 740