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Note 8. Debt and Financing Arrangements Financing Charges (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument, Annual Principal Payment $ 129 $ 5 $ 10
Interest Expense, Debt, Excluding Amortization 126 20 11
Amortization of Debt Issuance Costs 10 4 2
Interest Income, Other (4) (2) (1)
Interest Income (Expense), Net $ 132 $ 22 $ 12