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OTHER ASSETS (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Other Assets, Noncurrent [Abstract]              
Investments in non-consolidated joint ventures (see Note 15) $ 110 $ 102          
Asbestos-related recoveries (see Note 25) 55 76          
Unamortized revolver debt issuance costs 7 7          
Capitalized software costs, net 20 26          
Deferred income tax assets (see Note 24) 122 140          
Assets for uncertain tax positions (see Note 24) 55 53          
Prepaid pension costs (see Note 23) 149 152          
Intangible assets 50 18          
Other 38 22          
Other assets 606 596          
Finite-Lived Intangible Assets [Line Items]              
Intangible assets 50 18          
Investments in non-consolidated joint ventures 110 102          
Asset impairment 10 3 $ 4        
Customer Relationships              
Other Assets, Noncurrent [Abstract]              
Intangible assets 56 22          
Finite-Lived Intangible Assets [Line Items]              
Intangible assets 56 22          
Accumulated amortization $ 6 4          
Weighted average amortization period 15 years            
Corporate Joint Venture              
Other Assets, Noncurrent [Abstract]              
Investments in non-consolidated joint ventures (see Note 15) $ 69 63          
Finite-Lived Intangible Assets [Line Items]              
Investments in non-consolidated joint ventures 69 63          
Variable Interest Entity, Not Primary Beneficiary              
Finite-Lived Intangible Assets [Line Items]              
Investment owned at cost 12 6   $ 3 $ 3 $ 3 $ 3
AA Gear & Manufacturing, Inc.              
Finite-Lived Intangible Assets [Line Items]              
Other long-lived asset impairment 1            
Aftermarket, Industrial and Trailer              
Other Assets, Noncurrent [Abstract]              
Investments in non-consolidated joint ventures (see Note 15) 0 0          
Finite-Lived Intangible Assets [Line Items]              
Investments in non-consolidated joint ventures 0 $ 0          
Aftermarket, Industrial and Trailer | AA Gear & Manufacturing, Inc.              
Finite-Lived Intangible Assets [Line Items]              
Asset impairment $ 9