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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
State operating loss carryforwards $ 1,200,000,000    
Deferred tax asset valuation allowance 98,000,000 $ 79,000,000  
Decrease in deferred tax asset valuation allowance 19,000,000    
Unrecognized tax benefits that would impact effective tax rate 4,000,000    
Interest on unrecognized tax benefits accrued (released) during period 1,000,000 0 $ 0
Accrued interest on unrecognized tax benefits 0 1,000,000 2,000,000
Penalties accrued income tax examination 0 0 0
Penalties expense income tax examination 0 $ 0 $ 0
Tax Years Ended Prior to 1988      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Base year loan loss reserves attributable to prior years $ 557,000,000