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BENEFITS PAYABLE - Narrative (Details) claim in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) claim | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Claims Development [Line Items] |  |  |
Total IBNR | $ | $ 5,700 |  |
Favorable medical claims reserve development related to prior fiscal years | $ | $ 415 | $ 825 | $ 313
2022 Claims Incurred Year |  |  |
Claims Development [Line Items] |  |  |
Cumulative number of reported claims | 173.5 |  |
2021 Claims Incurred Year |  |  |
Claims Development [Line Items] |  |  |
Cumulative number of reported claims | 173.3 |  |
2020 Claims Incurred Year |  |  |
Claims Development [Line Items] |  |  |
Cumulative number of reported claims | 149.8 |  |

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- Definition Liability For Unpaid Claims And Claims Adjustment Expense, Cumulative Number Of Claims, Reported + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI https://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
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