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BENEFITS PAYABLE - Schedule of Incurred and Paid Claims Development (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | $ 265,439 |  |
Cumulative Paid Claims, Net of Reinsurance | 254,999 |  |
Benefits payable, net of reinsurance | 10,440 |  |
2022 & Prior |  |  |
Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | 75,399 | $ 75,447 | $ 76,105
Cumulative Paid Claims, Net of Reinsurance | 75,399 | 74,989 | $ 67,287
2023 |  |  |
Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | 88,675 | 89,328 |
Cumulative Paid Claims, Net of Reinsurance | 88,319 | $ 79,545 |
2024 |  |  |
Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | 101,365 |  |
Cumulative Paid Claims, Net of Reinsurance | $ 91,281 |  |

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