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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
reporting_unit
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policy [Line Items]      
Number of reportable segments | segment 1    
Advance collection $ (171,000,000) $ (8,000,000)  
Maximum reimbursement per claim occurrence $ 1,000,000    
Plan years to be settled 10 years    
Prepayments and miscellaneous receivables offsetting accrued health insurance costs $ 60,000,000 $ 58,000,000  
Weighted-average rate used in discounting the lease liabilities 4.90% 4.20%  
ERTC receivables $ 831,000,000 $ 311,000,000  
ERTC distributed $ 72,000,000 68,000,000  
Number of reporting units | reporting_unit 1    
Impairment Loss $ (1,000,000)    
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Depreciation and amortization of intangible assets    
Impairment of finite-lived intangible assets $ 24,000,000 0 $ 0
Advertising costs 20,000,000 37,000,000 29,000,000
Bad debt expense, net of recoveries $ 3,000,000 3,000,000 $ 2,000,000
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 | 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 $ 90,000,000 $ 68,000,000  
Non-US | Revenue | Geographic Concentration Risk      
Summary Of Significant Accounting Policy [Line Items]      
Concentration risk percentage 1.00%