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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 |  |

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