BENEFITS PAYABLE - Schedule of Incurred and Paid Claims Development (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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