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Acquisition - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Jan. 16, 2020
Jul. 26, 2019
Jun. 30, 2020
Business Acquisition [Line Items]      
Increase to goodwill     $ 1
AxleTech      
Business Acquisition [Line Items]      
Percentage of voting interests acquired   100.00%  
Purchase price   $ 179  
Adjustments decrease in receivables     1
Increase to goodwill     1
TransPower      
Business Acquisition [Line Items]      
Percentage of voting interests acquired 100.00%    
Purchase price $ 15   15
Fair value of investment prior to acquisition $ 12   $ 12