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Benefit Plans Other Postemployment Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Other Post-Employment Benefits      
Discount rate 2.52% 2.64% 1.65%
Period expense $ 34 $ (8) $ 52
Postemployment benefits liability 520 535 597
Amount of Postemployment benefit actuarial gain (loss) from discount rate change   45  
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent [Member]
      
Other Post-Employment Benefits      
Postemployment benefits liability, noncurrent 472 486  
Accounts payable and accrued liabilities
      
Other Post-Employment Benefits      
Postemployment benefits liability, current $ 48 $ 49