INCOME TAXES - NOL (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Operating loss carryforwards
Deferred tax benefit, net of valuation allowance and federal tax impact, associated with NOL carryforwards	$ 653	$ 715
Unrecognized federal and state tax benefits and reserves for interest and penalties, which may decrease in the next 12 months	5
Federal
Operating loss carryforwards
Net operating loss carryforwards subject to expiration	1,700
State
Operating loss carryforwards
Net operating loss carryforwards subject to expiration	3,000
Deferred tax benefit, net of valuation allowance and federal tax impact, associated with NOL carryforwards	$ 19