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Goodwill (Tables)
 6 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of the changes in carrying value of goodwill
A summary of the changes in the carrying value of goodwill by the company’s two reportable segments are presented below (in millions):
 
Commercial Truck & Industrial
 
Aftermarket
& Trailer
 
Total
Goodwill
$
245

 
$
160

 
$
405

Accumulated impairment losses
(15
)
 
—

 
(15
)
Beginning balance at September 30, 2016
230

 
160

 
390

Foreign currency translation
(3
)
 
(2
)
 
(5
)
Balance at March 31, 2017
$
227

 
$
158

 
$
385