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Goodwill (Tables)
 6 Months Ended
Mar. 31, 2020
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 9)
—

 
1

 
1

Goodwill acquired from acquisition (see Note 9)
22

 
—

 
22

Foreign currency translation
—

 
(1
)
 
(1
)
Ending Balance at March 31, 2020
$
283

 
$
217

 
$
500