RETIREMENT PENSION PLANS - Schedule of Pension Costs Recognized in Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Pension and other postretirement benefit, tax	$ 147	$ 33	$ 5
Pension Plan | Net Actuarial Loss
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Balance, beginning	644	616
Net prior service cost for the year	1
Net actuarial (gain) loss for the year	(25)	76
Amortization for the year	(30)	(23)
Pension and other postretirement benefit, tax	21	(25)
Balance, ending	611	644	616
U.S. Plans | Pension Plan | Net Actuarial Loss
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Balance, beginning	454	410
Net prior service cost for the year	1
Net actuarial (gain) loss for the year	(36)	87
Amortization for the year	(22)	(18)
Pension and other postretirement benefit, tax	21	(25)
Balance, ending	418	454	410
Non-U.S. Plans | Pension Plan | Net Actuarial Loss
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Balance, beginning	190	206
Net prior service cost for the year	0
Net actuarial (gain) loss for the year	11	(11)
Amortization for the year	(8)	(5)
Pension and other postretirement benefit, tax	0	0
Balance, ending	$ 193	$ 190	$ 206