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Other Financial Data (Other Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Other Financial Data [Abstract]    
Pension plans $ 539 $ 805
Deferred income taxes 823 592
Postretirement plans, excluding current portion 263 337
Other 688 722
Total $ 2,313 $ 2,456