INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SDT settlement	$ 21		$ 0	$ 21	$ 0
U.S. federal statutory income tax rate				21.00%	35.00%
Tax effect of U.S. corporate rate change			0	$ 0	$ 74
Tax provision benefit		$ 41
Valuation allowance	$ 61		64	$ 61
Canada
Reinvestment of undistributed earnings percentage from foreign subsidiaries				10.00%
Federal, state and foreign
Net operating loss carryforwards			850
Federal - U.S. REIT
Net operating loss carryforwards			302
Credit carryforwards			$ 7
Federal - U.S. REIT | Minimum
Operating Loss Carryforwards, Expiration Date			Dec. 31, 2034
Tax Credit Carryforward, Expiration Date			Dec. 31, 2027
Federal - U.S. REIT | Maximum
Operating Loss Carryforwards, Expiration Date			Dec. 31, 2036
Tax Credit Carryforward, Expiration Date			Dec. 31, 2028
State and Local Jurisdiction [Member]
Net operating loss carryforwards			$ 548
Operating Loss Carryforwards, Expiration Date			Dec. 31, 2022
Credit carryforwards			$ 67
State and Local Jurisdiction [Member] | With expiration
Credit carryforwards			16
State and Local Jurisdiction [Member] | Without expiration
Credit carryforwards			$ 51
State and Local Jurisdiction [Member] | Minimum
Tax Credit Carryforward, Expiration Date			Dec. 31, 2019
State and Local Jurisdiction [Member] | Maximum
Tax Credit Carryforward, Expiration Date			Dec. 31, 2033
Foreign Tax Authority
Net operating loss carryforwards			$ 0
U.S. Qualified Pension Plans
Payment for Pension Benefits				$ 300