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Benefit Plans Other Postemployment Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Other Post-Employment Benefits      
Discount rate 2.05% 2.52% 2.64%
Period expense $ 39 $ 34 $ (8)
Postemployment benefits liability 511 520 $ 535
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent [Member]      
Other Post-Employment Benefits      
Postemployment benefits liability, noncurrent 465 472  
Accounts payable and accrued liabilities      
Other Post-Employment Benefits      
Postemployment benefits liability, current $ 46 $ 48