INCOME TAXES - Income Tax (Benefit) Provision at the U.S Statutory Rate (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Statutory tax rate									35.00%	35.00%	35.00%
Foreign tax rate									35.00%	35.00%	35.00%
Expense for income taxes at statutory tax rate of 35%									$ (133)	$ (54)	$ (23)
State and local income taxes									(14)	(7)	(1)
Foreign income taxed at rates other than 35%									9	5	7
Joint venture equity income									7	3	3
Tax effect of nonfunctional currency transaction									(2)	(30)	0
Correlated tax relief									7	51	0
U.S. tax impact on distributions from subsidiaries and joint ventures									(8)	14	(11)
Nondeductible expenses									(10)	(12)	(9)
Tax credits									14	61	0
Valuation allowances									56	418	49
Tax rate change									0	(14)	0
Impact of capital loss									15	0	0
Other									7	(11)	(16)
Income tax benefit (expense)	$ (22)	$ (11)	$ (13)	$ (6)	$ 446	$ (8)	$ (7)	$ (7)	(52)	424	$ (1)
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax benefit (expense)									$ 11	$ 61