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SEGMENT INFORMATION - Schedule of Significant Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Interest income $ 64 $ 72 $ 22
Total revenues 5,053 4,994 4,907
Depreciation and amortization of intangible assets 75 72 64
Stock based compensation 65 59 62
Interest expense, bank fees and other 62 40 39
Income Taxes 53 126 127
Net income 173 375 355
Reportable Segments      
Segment Reporting Information [Line Items]      
Interest income 64 72 22
Total revenues 5,053 4,994 4,907
Workers' compensation costs 61 68 81
Health insurance costs 3,736 3,445 3,382
Sales & marketing 259 254 226
Client support costs 184 186 192
Corporate administration 146 165 191
System support & development 190 187 151
Depreciation and amortization of intangible assets 75 72 64
Stock based compensation 65 59 62
Other 49 17 37
Interest expense, bank fees and other 62 40 39
Income Taxes 53 126 127
Net income 173 375 355
Professional service revenues      
Segment Reporting Information [Line Items]      
Service revenues 765 756 754
Professional service revenues | Reportable Segments      
Segment Reporting Information [Line Items]      
Service revenues 765 756 754
Insurance service revenues      
Segment Reporting Information [Line Items]      
Service revenues 4,224 4,166 4,131
Insurance service revenues | Reportable Segments      
Segment Reporting Information [Line Items]      
Service revenues $ 4,224 $ 4,166 $ 4,131