Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Deferred Tax Liabilities, Net $ 123    
Unrecognized tax benefits 0 $ 50 $ 24
Net deferred tax asset, operating loss carryforwards 95    
Net deferred tax asset, operating loss carryforwards, domestic 51    
Net deferred tax asset, operating loss carryforwards, state and local 44    
Net deferred tax asset, alternative minimum tax carryforward 1    
Federal capital loss carryforward valuation allowance 6 $ 6  
Bad debt reserves with no federal income tax liability 12    
Unrecognized deferred tax liability from cumulative bad debt reduction $ 3    
Operating Loss Carryforward Federal      
Operating Loss Carryforwards [Line Items]      
Net deferred tax asset carryforward expiration date Dec. 31, 2030    
Operating Loss Carryforward State      
Operating Loss Carryforwards [Line Items]      
Net deferred tax asset carryforward expiration date Dec. 31, 2019    
Federal capital loss carryforward valuation allowance $ 6    
Tax Credit Carryforward, Name [Domain]      
Operating Loss Carryforwards [Line Items]      
Net deferred tax asset carryforward expiration date Dec. 31, 2022