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Benefit Plans Other Postemployment Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Other Post-Employment Benefits      
Discount rate 1.60% 2.05% 2.52%
Period expense $ 35 $ 39 $ 34
Postemployment benefits liability 501 511 $ 520
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent      
Other Post-Employment Benefits      
Postemployment benefits liability, noncurrent 460 465  
Accounts payable and accrued liabilities      
Other Post-Employment Benefits      
Postemployment benefits liability, current $ 41 $ 46