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Note 5,Debt and Financing Arrangements 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]        
Interest Expense, Debt, Excluding Amortization $ 31 $ 1 $ 96 $ 4
Amortization of Debt Issuance Costs 2 1 6 3
Interest Income, Other (2) 0 (3) 0
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives 0 0 0 1
Interest Income (Expense), Net $ 31 $ 2 $ 99 $ 8