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Note 16. Income Taxes Unrecognized Tax Benefits (Tables)
 12 Months Ended
Sep. 30, 2017
Operating Loss Carryforwards [Line Items]  
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
 
 
Year Ended September 30,
(in millions)
 
2017
 
2016
 
2015
Beginning balance
 
$
596

 
$
390

 
$
284

Additions for tax positions related to the current year
 
76

 
288

 
138

Additions for tax positions of prior years
 
5

 
—

 
—

Reductions for tax positions of prior years
 
(471
)
 
(65
)
 
(32
)
Settlements with taxing authorities
 
(7
)
 
(15
)
 
—

Statute closings
 
(6
)
 
(2
)
 
—

Ending balance
 
$
193

 
$
596

 
$
390