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COMMITMENTS, GUARANTEES AND CONTINGENCIES (Details) beneficiary in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 15, 2024 USD ($) | Dec. 31, 2022 state option_period beneficiary | Dec. 31, 2024 USD ($) state beneficiary
Loss Contingencies [Line Items] |  |  |
Purchase obligations in 2025 |  |  | $ 647
Purchase obligations in 2026 |  |  | 469
Purchase obligations in 2027 |  |  | 342
Purchase obligations in 2028 |  |  | 234
Purchase obligations in 2029 |  |  | $ 205
United States Of America Ex Rel. Steven Scott V. Humana Inc. |  |  |
Loss Contingencies [Line Items] |  |  |
Payments for legal settlements | $ 90 |  |
TRICARE 2017 East Region Contract |  |  |
Loss Contingencies [Line Items] |  |  |
Number of states comprising TRICARE beneficiaries | state |  |  | 32
Number of TRICARE beneficiaries | beneficiary |  |  | 6.0
TRICARE Managed Care Support Contract, Effective 2024 |  |  |
Loss Contingencies [Line Items] |  |  |
Number of states comprising T-5 east region contract beneficiaries | state |  | 24 |
Number of T-5 east region contract beneficiaries | beneficiary |  | 4.6 |
Contract base term (in years) |  | 1 year |
Annual option periods | option_period |  | 8 |
Contract term with exercises (in years) |  | 9 years |
Medicare |  |  |
Loss Contingencies [Line Items] |  |  |
Total premiums and services revenue (as percent) |  |  | 85.00%
Medicaid |  |  |
Loss Contingencies [Line Items] |  |  |
Total premiums and services revenue (as percent) |  |  | 8.00%
Military Services | TRICARE 2017 East Region Contract |  |  |
Loss Contingencies [Line Items] |  |  |
Total premiums and services revenue (as percent) |  |  | 1.00%

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