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REVENUE RECOGNITION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Percentage of net revenues 100.00% 100.00% 100.00%
Percentage of net accounts receivable 100.00% 100.00%  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 27 $ 30  
Write-offs of accounts receivable, net of recoveries (3) (4)  
Ending balance 29 27 $ 30
Provision for credit losses $ 5 $ 1 $ 3
Medicare and Medicaid Programs      
Segment Reporting Information [Line Items]      
Percentage of net revenues 11.00% 11.00% 11.00%
Healthcare insurers: | Minimum      
Segment Reporting Information [Line Items]      
Collection of consideration 30 days    
Healthcare insurers: | Maximum      
Segment Reporting Information [Line Items]      
Collection of consideration 60 days    
Government payers (principally fee-for-service)      
Segment Reporting Information [Line Items]      
Collection of consideration 30 days    
Government payers (principally fee-for-service) | Medicare and Medicaid Programs      
Segment Reporting Information [Line Items]      
Percentage of net accounts receivable 6.00% 7.00%  
Client payers | Minimum      
Segment Reporting Information [Line Items]      
Collection of consideration 60 days    
Client payers | Maximum      
Segment Reporting Information [Line Items]      
Collection of consideration 90 days    
Patients (including coinsurance and deductible responsibilities) | Minimum      
Segment Reporting Information [Line Items]      
Collection of consideration 30 days    
Patients (including coinsurance and deductible responsibilities) | Maximum      
Segment Reporting Information [Line Items]      
Collection of consideration 60 days    
DS | Minimum      
Segment Reporting Information [Line Items]      
Collection of consideration 30 days    
DS | Maximum      
Segment Reporting Information [Line Items]      
Collection of consideration 60 days    
DIS business      
Segment Reporting Information [Line Items]      
Percentage of net revenues 97.00% 97.00% 97.00%
Percentage of net accounts receivable 98.00% 96.00%  
DIS business | Minimum      
Segment Reporting Information [Line Items]      
Percentage of net revenues 95.00% 95.00% 95.00%
DIS business | Healthcare insurers:      
Segment Reporting Information [Line Items]      
Percentage of net revenues 40.00% 40.00% 41.00%
Percentage of net accounts receivable 26.00% 24.00%  
DIS business | Healthcare insurers: | Fee-for-service      
Segment Reporting Information [Line Items]      
Percentage of net revenues 37.00% 37.00% 38.00%
DIS business | Healthcare insurers: | Capitated      
Segment Reporting Information [Line Items]      
Percentage of net revenues 3.00% 3.00% 3.00%
DIS business | Government payers (principally fee-for-service)      
Segment Reporting Information [Line Items]      
Percentage of net revenues 13.00% 11.00% 11.00%
Percentage of net accounts receivable 7.00%    
DIS business | Client payers      
Segment Reporting Information [Line Items]      
Percentage of net revenues 33.00% 34.00% 33.00%
Percentage of net accounts receivable 45.00% 45.00%  
DIS business | Patients (including coinsurance and deductible responsibilities)      
Segment Reporting Information [Line Items]      
Percentage of net revenues 11.00% 12.00% 12.00%
Period of billing fully reserve 210 days    
Percentage of net accounts receivable 20.00% 20.00%  
DS businesses | DS      
Segment Reporting Information [Line Items]      
Percentage of net revenues 3.00% 3.00% 3.00%
Percentage of net accounts receivable 2.00% 4.00%