INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation allowance	$ (72)	$ (72)
Foreign undistributed earnings	34
Unrecognized tax benefits	6	11	$ 26
Unrecognized tax benefits, interest	1	3
Unrecognized tax benefits, payment made in advance of settlements		6
Credits and loss carryovers	3	4
Unrecognized tax benefits, net	4	4
Unrecognized tax benefits that would affect our effective tax rate	5	$ 12
Unrecognized tax benefits, decrease estimate due to resolution of examinations	1
U.S. TRS
Net operating loss carryforwards	$ 29
Net operating loss carryforwards, expiration dates	Dec. 31, 2035
Credit carryforwards	$ 93
U.S. TRS | Minimum
Credit carryforwards, expiration dates	Dec. 31, 2019
U.S. TRS | Maximum
Credit carryforwards, expiration dates	Dec. 31, 2035
Foreign
Net operating loss carryforwards	$ 142
Credit carryforwards	$ 6
Foreign | Minimum
Net operating loss carryforwards, expiration dates	Dec. 31, 2016
Credit carryforwards, expiration dates	Dec. 31, 2016
Foreign | Maximum
Net operating loss carryforwards, expiration dates	Dec. 31, 2032
Credit carryforwards, expiration dates	Dec. 31, 2032
State
Net operating loss carryforwards	$ 299
Credit carryforwards	$ 43
State | Minimum
Net operating loss carryforwards, expiration dates	Dec. 31, 2024
Credit carryforwards, expiration dates	Dec. 31, 2016
State | Maximum
Net operating loss carryforwards, expiration dates	Dec. 31, 2035
Credit carryforwards, expiration dates	Dec. 31, 2029
Federal, state and foreign
Net operating loss carryforwards	$ 903
Credit carryforwards	188
U.S. REIT
Net operating loss carryforwards	$ 433
U.S. REIT | Minimum
Net operating loss carryforwards, expiration dates	Dec. 31, 2030
U.S. REIT | Maximum
Net operating loss carryforwards, expiration dates	Dec. 31, 2035
Without expiration | State
Credit carryforwards	$ 46