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
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00%    
Tax benefit as a result of TCJA relating primarily to revaluation of net deferred tax liabilities   $ 123    
Unrecognized tax benefits   50 $ 24 $ 23
Net deferred tax asset, operating loss carryforwards   261    
Net deferred tax asset, operating loss carryforwards, domestic   65    
Deferred Tax Assets, Charitable Contribution Carryforwards   1    
Net deferred tax asset, operating loss carryforwards, state and local   42    
Net deferred tax asset, alternative minimum tax carryforward   121    
Net deferred tax asset, general business credit carryforward   32    
Federal capital loss carryforward valuation allowance   6 5  
Bad debt reserves with no federal income tax liability   12    
Unrecognized deferred tax liability from cumulative bad debt reduction   $ 3    
Forecast        
Operating Loss Carryforwards [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%      
Operating Loss Carryforward Federal        
Operating Loss Carryforwards [Line Items]        
Net deferred tax asset carryforward expiration date   Dec. 31, 2023    
Operating Loss Carryforward State        
Operating Loss Carryforwards [Line Items]        
Net deferred tax asset carryforward expiration date   Dec. 31, 2018    
Federal capital loss carryforward valuation allowance   $ 6 $ 5  
General Business Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Net deferred tax asset carryforward expiration date   Dec. 31, 2037