INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal Statutory Income Tax Rate, Percent		21.00%	35.00%
Valuation allowance		$ (61)	$ (63)
Unrecognized tax benefits		3	4	$ 6
Unrecognized tax benefits, net		1	2
Credits and loss carryovers		2	2
Unrecognized tax benefits that would affect our effective tax rate		1	2
Estimated decrease in unrecognized tax benefit due to the lapse of application statutes of limitation			1
Tax affect of U.S. corporate rate change		0	74	0
Tax provision benefit	$ 41
SDT settlement		21	0	$ 0
Foreign Tax Authority [Member]
Net operating loss carryforwards		0
Foreign undistributed earnings			$ 0
Federal, state and foreign
Net operating loss carryforwards		584
U.S. REIT
Net operating loss carryforwards		$ 223
Tax Credit Carryforward, Expiration Date		Dec. 31, 2027
Credit carryforwards		$ 6
U.S. REIT | Minimum
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2031
U.S. REIT | Maximum
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2036
State and Local Jurisdiction [Member]
Net operating loss carryforwards		$ 361
Credit carryforwards		$ 65
State and Local Jurisdiction [Member] | Minimum
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2019
Tax Credit Carryforward, Expiration Date		Dec. 31, 2019
State and Local Jurisdiction [Member] | Maximum
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Tax Credit Carryforward, Expiration Date		Dec. 31, 2032
With expiration | State and Local Jurisdiction [Member]
Credit carryforwards		$ 14
Without expiration | State and Local Jurisdiction [Member]
Credit carryforwards		$ 51
Qualified Pension Plans, Defined Benefit [Member]
Payment for Pension Benefits	$ 300