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Related Party Transactions (Tables)
12 Months Ended
Sep. 30, 2018
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
The following table sets forth the amount of accounts receivable due from and payable to related parties in the consolidated statements of financial position (in millions):
 
 
September 30,
 
 
2018
 
2017
 
 
 
 
 
Receivable from related parties
 
$
103

 
$
131

Payable to related parties
 
75

 
50