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Goodwill (Tables)
 3 Months Ended
Dec. 31, 2019
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
 
Aftermarket, Industrial and Trailer
 
Total
Goodwill
$
261

 
$
232

 
$
493

Accumulated impairment losses
—

 
(15
)
 
(15
)
Beginning Balance at September 30, 2019
261

 
217

 
478

AxleTech measurement period adjustment (see Note 10)
—

 
2

 
2

Foreign currency translation
4

 
2

 
6

Ending Balance at December 31, 2019
$
265

 
$
221

 
$
486