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Commitments (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Guarantor Obligations [Line Items]    
Potential maximum obligation under cash flow assistance programs $ 330  
Total receivables under cash flow assistance programs 0 $ 0
Uncollectible receivables estimated under cash flow assistance programs 0 0
Guarantor Obligations, Current Carrying Value 0 $ 0
Industrial Revenue Bonds [Member]    
Guarantor Obligations [Line Items]    
Industrial Revenue Bonds $ 643  
Guarantee of Indebtedness of Others [Member]    
Guarantor Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Period (in years) 10 years  
Maximum potential amount $ 20  
Residual Value Guarantees [Member]    
Guarantor Obligations [Line Items]    
Maximum potential amount $ 104  
Guarantor Obligations, Maximum Exposure, Remaining Lease Period (in years) 10 years  
Amount recoverable through various recourse provisions $ 94