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COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Legal and Regulatory Proceedings) (Details)
loan in Thousands, $ in Millions
6 Months Ended 12 Months Ended
Jul. 28, 2020
USD ($)
May 19, 2020
USD ($)
Aug. 08, 2019
USD ($)
Jun. 30, 2020
USD ($)
claim
Dec. 31, 2007
USD ($)
loan
Dec. 31, 2019
USD ($)
Oct. 31, 2013
USD ($)
Loss Contingencies [Line Items]              
Accrued legal and regulatory liabilities       $ 185.0   $ 295.0  
JPMorgan Chase Mortgage Loan Sale Indemnity Demand              
Loss Contingencies [Line Items]              
Number of mortgage loans sold | loan         35    
Damages sought, value         $ 38.0    
Consumer Remediation              
Loss Contingencies [Line Items]              
Litigation settlement, amount awarded to other party   $ 65.0          
Investigation Costs              
Loss Contingencies [Line Items]              
Litigation settlement, amount awarded to other party   5.0          
Settlement Administration Costs              
Loss Contingencies [Line Items]              
Litigation settlement, amount awarded to other party   2.0          
Debt Forgiveness              
Loss Contingencies [Line Items]              
Litigation settlement, amount awarded to other party   $ 45.0          
Puerto Rico FINRA Arbitrations              
Loss Contingencies [Line Items]              
Number of FINRA arbitration cases | claim       764      
Number of claims that remain pending | claim       346      
Puerto Rico Closed-End Funds Shareholder Derivative and Class Action | Puerto Rico              
Loss Contingencies [Line Items]              
Bonds (more than)             $ 180.0
Closed-end funds             $ 101.0
Puerto Rico Municipal Bond Insurer Litigation | Puerto Rico              
Loss Contingencies [Line Items]              
Damages sought, value     $ 720.0        
Deka Investment v. Santander Comsumer USA Holdings Inc. | Subsequent Event              
Loss Contingencies [Line Items]              
Loss contingency, damages paid, value $ 47.0            
Maximum              
Loss Contingencies [Line Items]              
Estimate of possible loss       $ 145.0