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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2021 USD ($) reporting_unit segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Apr. 30, 2020 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Number of reportable segments | segment | 1 |  |  |
Recovery credit program, maximum allowed amount |  |  |  | $ 145,000,000
Unsatisfied performance obligations | $ 23,000,000 | $ 92,000,000 | $ 0 |
Incentive credits | 25,000,000 |  |  |
Advance collection | 8,000,000 | 24,000,000 |  |
Maximum reimbursement per claim occurrence | $ 1,000,000 |  |  |
Plan years to be settled | 10 years |  |  |
Prepaid Insurance | $ 54,000,000 | $ 49,000,000 |  |
Weighted-average rate used in discounting the lease liabilities | 3.90% | 4.00% |  |
Number of reporting units | reporting_unit | 1 |  |  |
Impairment of goodwill | $ 0 | $ 0 | 0 |
Impairment of finite-lived intangible assets | 7,000,000 | 0 | 0 |
Advertising costs | $ 21,000,000 | 19,000,000 | $ 18,000,000 |
Minimum |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of intangible assets | 1 year |  |  |
Minimum | Software Development |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of intangible assets | 3 years |  |  |
Minimum | Software And Office Equipment |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of property and equipment | 3 years |  |  |
Minimum | Furniture, fixtures, and equipment |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of property and equipment | 5 years |  |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of intangible assets | 10 years |  |  |
Maximum | Software Development |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of intangible assets | 5 years |  |  |
Maximum | Software And Office Equipment |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of property and equipment | 5 years |  |  |
Maximum | Furniture, fixtures, and equipment |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Estimated useful life of property and equipment | 7 years |  |  |
Non-US | Geographic Concentration Risk | Revenue |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Concentration risk percentage | 1.00% |  |  |
Health Care |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Prepaid Insurance | $ 79,000,000 | $ 58,000,000 |  |

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