BENEFITS PAYABLE - Incurred and Paid Claims Development (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Claims Development [Line Items]
Incurred Claims, Net of Reinsurance	$ 207,027
Cumulative Paid Claims, Net of Reinsurance	197,763
Benefits payable, net of reinsurance	9,264
2020 Claims Incurred Year
Claims Development [Line Items]
Incurred Claims, Net of Reinsurance	61,224	$ 61,258	$ 61,941
Cumulative Paid Claims, Net of Reinsurance	61,224	60,886	$ 54,003
2021 Claims Incurred Year
Claims Development [Line Items]
Incurred Claims, Net of Reinsurance	69,698	70,066
Cumulative Paid Claims, Net of Reinsurance	69,252	$ 62,149
2022 Claims Incurred Year
Claims Development [Line Items]
Incurred Claims, Net of Reinsurance	76,105
Cumulative Paid Claims, Net of Reinsurance	$ 67,287