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Goodwill (Tables)
 9 Months Ended
Jun. 30, 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 (1)
$
266

 
$
170

 
$
436

Accumulated impairment losses (1)
—

 
(15
)
 
(15
)
Beginning Balance at September 30, 2018 (1)
266

 
155

 
421

AAG measurement period adjustment (see Note 9)
—

 
3

 
3

Foreign currency translation
(3
)
 
—

 
(3
)
Ending Balance at June 30, 2019
$
263

 
$
158

 
$
421


(1) Amounts have been recast to reflect reportable segment changes (see Note 23).