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Debt and Financing Arrangements - Components of Net Financing Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Debt Disclosure [Abstract]        
Transactions costs related to debt exchange offers     $ 17  
Interest expense, net of capitalized interest costs $ 115 $ 66 343 $ 203
Banking fees and bond cost amortization 14 7 55 19
Interest income (4) (4) (16) (8)
Net foreign exchange results for financing activities (1) (4) (6) (12)
Net financing charges $ 124 $ 65 $ 376 $ 202