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Note 8. Debt and Financing Arrangements (Tables)
12 Months Ended
Sep. 30, 2017
Short-term Debt [Line Items]  
Schedule of Short-term Debt [Table Text Block]
Short-term debt consisted of the following:
 
 
Year Ended
September 30,
(in millions)
 
2017
 
2016
 
2015
Bank borrowings
 
$
36

 
$
41

 
$
17

Weighted average interest rate on short-term debt outstanding (1)
 
3.0
%
 
5.9
%
 
13.7
%