BENEFITS PAYABLE - Narrative (Details) claim in Millions, $ in Millions	12 Months Ended
	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