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REVENUE RECOGNITION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 30 | $ 31 |
Write-offs of accounts receivable, net of recoveries | (4) | (4) |
Ending balance | 27 | 30 | $ 31
Provision for credit losses | $ 1 | $ 3 | $ 4
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 |  |  |
Segment Reporting Information [Line Items] |  |  |
Collection of consideration | 30 days |  |
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 | 96.00% | 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% | 41.00% | 42.00%
Percentage of net accounts receivable | 24.00% | 28.00% |
DIS business | Healthcare insurers: | Fee-for-service |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net revenues | 37.00% | 38.00% | 39.00%
DIS business | Healthcare insurers: | Capitated |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net revenues | 3.00% | 3.00% | 3.00%
DIS business | Government payers |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net revenues | 11.00% | 11.00% | 10.00%
Percentage of net accounts receivable | 7.00% | 6.00% |
DIS business | Client payers |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net revenues | 34.00% | 33.00% | 33.00%
Percentage of net accounts receivable | 45.00% | 44.00% |
DIS business | Patients (including coinsurance and deductible responsibilities) |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net revenues | 12.00% | 12.00% | 12.00%
Period of billing fully reserve | 210 days |  |
Percentage of net accounts receivable | 20.00% | 18.00% |
All other operating segments | DS |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net revenues | 3.00% | 3.00% | 3.00%
Percentage of net accounts receivable | 4.00% | 4.00% |

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