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CREDIT CARD AND LOAN RECEIVABLES - Troubled Debt Restructurings (Details) - Consumer Portfolio
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Credit Card Receivables    
Modifications related to troubled debt restructurings within credit card and loan receivables    
Number of Restructurings | item 259,311 501,906
Pre-modification Outstanding Balance $ 381.4 $ 621.4
Post-modification Outstanding Balance $ 380.8 $ 620.7
Troubled debt restructurings that subsequently defaulted - credit card receivables    
Modifications related to troubled debt restructurings within credit card and loan receivables    
Number of Restructurings | item 126,476 293,591
Outstanding Balance $ 170.8 $ 340.5