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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
Product Information [Line Items]    
Number of reportable segments | segment 1  
Prepayments offsetting accrued health insurance costs $ 121 $ 60
ERTC receivables 572 831
ERTC distributed 39 72
Operating lease right-of-use asset 39 24
Atlanta Corporate Center    
Product Information [Line Items]    
Future minimum lease payments 40  
Operating lease right-of-use asset 19  
Operating lease liabilities 19  
Health Care    
Product Information [Line Items]    
Prepayments offsetting accrued health insurance costs $ 25 $ 90
Non-US | Revenue | Foreign Sales    
Product Information [Line Items]    
Percent of concentration risk (less than) 1.00%