RETIREMENT MEDICAL PLANS - Additional Information (Details)	1 Months Ended		3 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2016 USD ($)	Sep. 26, 2014 USD ($)	Sep. 30, 2004 class_action_lawsuit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate (weighted average)	6.52%				6.52%
Reduction in APBO from subsidy		$ 25,000,000				$ 35,000,000
Net actuarial loss estimated to be amortized from accumulated other comprehensive loss	$ (17,000,000)				$ (17,000,000)
The prior service benefit estimated to be amortized from accumulated other comprehensive loss to periodic benefits cost	35,000,000				$ 35,000,000
Postemployment Retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual defined contribution per retiree	$ 4,000
Average remaining service period of active participants	7 years
Prior service credit to be amortized	$ 315,000,000
Average period of amortization, inactive plan participants	10 years
U.S. Retiree Medical Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average remaining service period of active participants					10 years
Average period of amortization, inactive plan participants					10 years
Decrease in benefit obligations			$ 18,000,000
Curtailment gain				$ 16,000,000
Decrease in retiree medical expense				$ 15,000,000
Health care cost trend rate (weighted average)	6.52%		7.00%		6.52%		7.10%
Liability for retroactive benefits	$ 0				$ 0		$ 2,000,000
U.S. Retiree Medical Plan | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Face amount of employee life insurance coverage per employee								$ 3,750
U.S. Retiree Medical Plan | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Face amount of employee life insurance coverage per employee								$ 15,000
Cole v. ArvinMeritor, et al. and Faust v. ArvinMeritor, et al.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of class action lawsuits, subsequently consolidated | class_action_lawsuit									2