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BENEFITS PAYABLE - Narrative (Details) claim in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) claim | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Claims Development [Line Items] |  |  |
Benefits payable including IBNR | $ | $ 7,300 | $ 6,600 |
Favorable medical claims reserve development related to prior fiscal years | $ | $ 701 | $ 872 | $ 415
2024 |  |  |
Claims Development [Line Items] |  |  |
Cumulative number of reported claims | 224.4 |  |
2023 |  |  |
Claims Development [Line Items] |  |  |
Cumulative number of reported claims | 211.4 |  |
2022 |  |  |
Claims Development [Line Items] |  |  |
Cumulative number of reported claims | 182.8 |  |

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