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Debt and Financing Arrangements Net Financing Charges (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Debt Disclosure [Abstract]      
Interest expense, net of capitalized interest costs $ 466 $ 293 $ 275
Bank fees and bond cost amortization 67 30 21
Interest income (19) (12) (7)
Net foreign exchange results for financing activities (18) (22) (15)
Net financing charges $ 496 $ 289 $ 274