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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) reporting_unit segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |
Number of reportable segments | segment | 1 |  |
Advance collection | $ 8,000,000 | $ 9,000,000 |
Maximum reimbursement per claim occurrence | $ 1,000,000 |  |
Plan years to be settled | 10 years |  |
Prepayments and miscellaneous receivables offsetting accrued health insurance costs | $ 58,000,000 | $ 57,000,000 |
Weighted-average rate used in discounting the lease liabilities | 4.20% | 3.90% |
Number of reporting units | reporting_unit | 1 |  |
Impairment of goodwill | $ 0 | $ 0 | $ 0
Advertising costs | 37,000,000 | 29,000,000 | 21,000,000
Bad debt expense, net of recoveries | $ 3,000,000 | 2,000,000 | $ 0
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 | Furniture, fixtures, and equipment |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of property and equipment | 5 years |  |
Minimum | Office equipment, including data processing 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 | 6 years |  |
Maximum | Furniture, fixtures, and equipment |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of property and equipment | 7 years |  |
Maximum | Office equipment, including data processing equipment |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of property and equipment | 7 years |  |
Health Care |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Prepayments and miscellaneous receivables offsetting accrued health insurance costs | $ 68,000,000 | $ 73,000,000 |
Non-US | Geographic Concentration Risk | Revenue |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Concentration risk percentage | 1.00% |  |

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