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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
reporting_unit
Dec. 31, 2021
USD ($)
Dec. 31, 2020
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
Advance collection $ 9,000,000 $ 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 $ 57,000,000 $ 54,000,000    
Weighted-average rate used in discounting the lease liabilities 3.90% 3.90%    
Number of reporting units | reporting_unit 1      
Impairment of goodwill $ 0 $ 0 $ 0  
Impairment of finite-lived intangible assets 0 7,000,000 0  
Advertising costs 29,000,000 21,000,000 19,000,000  
Bad debt expense, net of recoveries $ 2,000,000 0 $ 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 5 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 $ 73,000,000 $ 79,000,000    
Non-US | Geographic Concentration Risk | Revenue        
Summary Of Significant Accounting Policy [Line Items]        
Concentration risk percentage 1.00%