Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Narrative (Details)

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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
 3 Months Ended 12 Months Ended
Jul. 22, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
lawsuit
claim
plaintiff
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Line Items]          
Cash paid for data processing, outsourcing services and other agreements     $ 52,000,000 $ 49,000,000 $ 40,000,000
Change in control event, voting stock acquired (or more)     20.00%    
Percent of common stock received upon merger     66.67%    
Conditional payment for unrecognized severance benefit for key executives     $ 36,800,000    
Conditional payout percentage of target award     100.00%    
Maximum potential future payments required to make under guarantees     $ 0    
Accrual related to indemnifications     $ 0 0  
Indian Tribes And Nations          
Commitments and Contingencies Disclosure [Line Items]          
Pending claims, number | claim     3    
Google Agreement          
Commitments and Contingencies Disclosure [Line Items]          
Expected future year's minimum contractual obligation     $ 120,000,000    
Expected future year's minimum contractual obligation within any annual period     44,000,000    
Cash paid for data processing, outsourcing services and other agreements     $ 14,000,000 $ 7,000,000 $ 4,000,000
Minimum          
Commitments and Contingencies Disclosure [Line Items]          
Benefit continuation period     2 years    
Maximum          
Commitments and Contingencies Disclosure [Line Items]          
Benefit continuation period     3 years    
Letter of Credit          
Commitments and Contingencies Disclosure [Line Items]          
Notional amount     $ 0    
Performance Bonds          
Commitments and Contingencies Disclosure [Line Items]          
Notional amount     $ 0    
Data Processing, Outsourcing Services And Other Agreements | Minimum          
Commitments and Contingencies Disclosure [Line Items]          
Data processing, outsourcing services and other agreements, expiration year     2020    
Data processing, outsourcing services and other agreements, estimated aggregate contractual obligation     $ 296,000,000    
Non cancelable contractual obligations within any annual period     $ 109,000,000    
Data Processing, Outsourcing Services And Other Agreements | Maximum          
Commitments and Contingencies Disclosure [Line Items]          
Data processing, outsourcing services and other agreements, expiration year     2026    
IBM Operations Support Services Agreement          
Commitments and Contingencies Disclosure [Line Items]          
Expected future year's minimum contractual obligation     $ 85,000,000    
Expected future year's minimum contractual obligation within any annual period     $ 42,000,000    
Canada          
Commitments and Contingencies Disclosure [Line Items]          
Pending claims, number | claim     8    
Pending national claims, number | claim     6    
Loss contingency, number of plaintiffs | plaintiff     19,000    
Cybersecurity Incident          
Commitments and Contingencies Disclosure [Line Items]          
Loss contingency, loss in period $ 380,500,000        
Additional contributions for unreimbursed costs and expenses     $ 125,000,000.0    
Cybersecurity Incident | MSAG Group          
Commitments and Contingencies Disclosure [Line Items]          
Penalties paid   $ 180,500,000      
Cybersecurity Incident | CFPB          
Commitments and Contingencies Disclosure [Line Items]          
Penalties paid   100,000,000.0      
Cybersecurity Incident | NYDFS          
Commitments and Contingencies Disclosure [Line Items]          
Penalties paid   $ 10,000,000.0      
Cybersecurity Incident | Selling, general and administrative expenses          
Commitments and Contingencies Disclosure [Line Items]          
Loss contingency, loss in period     $ 800,900,000    
Cybersecurity Incident | GEORGIA          
Commitments and Contingencies Disclosure [Line Items]          
Pending claims, number | lawsuit     4    
Number of claims combined into a single claim | lawsuit     3    
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services          
Commitments and Contingencies Disclosure [Line Items]          
Loss contingency, loss in period     $ 800,900,000