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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
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