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Other Financial Data (Other Operating Cash Flow) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Other Financial Data [Abstract]      
Pension expense $ 173 $ 145 $ 132
Stock compensation expense 100 121 217
(Gain) Loss on sale of businesses, net of tax 5 (25) (167)
Deferred income taxes and other (97) 19 15
Total $ 181 $ 260 $ 197