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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Health Care Cost Payments, Net (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |
Health care cost payments | $ (7,110) | $ (6,943) | $ (6,253)
Health care cost reimbursements | 7,135 | 6,898 | 6,252
Net reimbursements (payments) | $ 25 | $ (45) | $ (1)

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- Definition Health care cost payments associated with the TRICARE South Region contract + References No definition available. + Details
Name: | hum_HealthCareCostPayments
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The difference between health care cost payments and reimbursements related to the TRICARE South Region contract. + References No definition available. + Details
Name: | hum_HealthCareCostPaymentsAndReimbursementsNet
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reimbursements for health care cost payments associated with the TRICARE South Region contract + References No definition available. + Details
Name: | hum_HealthCareCostReimbursements
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration