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Goodwill (Tables)
 3 Months Ended
Dec. 31, 2018
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 & Trailer
 
Aftermarket & Industrial
 
Total
Goodwill (1)
$
289

 
$
147

 
$
436

Accumulated impairment losses (1)
—

 
(15
)
 
(15
)
Beginning Balance at September 30, 2018
289

 
132

 
421

Foreign currency translation
(2
)
 
(1
)
 
(3
)
Balance at December 31, 2018
$
287

 
$
131

 
$
418


(1) Amounts have been recast to reflect reportable segment changes made in the second quarter of fiscal year 2018 (see Note 23).