COMMITMENTS, GUARANTEES AND CONTINGENCIES (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) beneficiary state option_period
Loss Contingencies [Line Items]
Purchase obligations in 2023	$ 687
Purchase obligations in 2024	451
Purchase obligations in 2025	288
Purchase obligations in 2026	236
Purchase obligations in 2027	$ 153
Number of states comprising TRICARE beneficiaries \| state	32
Number of TRICARE beneficiaries \| beneficiary	6,000,000,000,000
Number of TRICARE Managed Care Support Contract beneficiaries \| beneficiary	4,600,000
Number of states comprising TRICARE Managed Care Support Contract beneficiaries \| state	24
Contract base term	1 year
Annual option periods \| option_period	8
Contract term with exercises	9 years
Medicare
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	81.00%
Medicaid
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	6.00%
Military services
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	1.00%

Number Of States Comprising Of TRICARE Managed Care Support Contract Beneficiaries

No definition available.

Name:	hum_NumberOfStatesComprisingOfTRICAREManagedCareSupportContractBeneficiaries
Namespace Prefix:	hum_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of States Comprising TRICARE Beneficiaries

+ References

No definition available.

+ Details

Name:	hum_NumberOfStatesComprisingTRICAREBeneficiaries
Namespace Prefix:	hum_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of TRICARE Beneficiaries

+ References

No definition available.

+ Details

Name:	hum_NumberOfTRICAREBeneficiaries
Namespace Prefix:	hum_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of TRICARE Managed Care Support Contract Beneficiaries

+ References

No definition available.

+ Details

Name:	hum_NumberOfTRICAREManagedCareSupportContractBeneficiaries
Namespace Prefix:	hum_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Of Total Premium And Services Revenues

+ References

No definition available.

+ Details

Name:	hum_PercentageOfTotalPremiumAndServicesRevenues
Namespace Prefix:	hum_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

TRICARE Managed Care Support Contract, Base Term

+ References

No definition available.

+ Details

Name:	hum_TRICAREManagedCareSupportContractBaseTerm
Namespace Prefix:	hum_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

TRICARE Managed Care Support Contract, Number Of Option Periods

+ References

No definition available.

+ Details

Name:	hum_TRICAREManagedCareSupportContractNumberOfOptionPeriods
Namespace Prefix:	hum_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

TRICARE Managed Care Support Contract, Term With Option Exercises

+ References

No definition available.

+ Details

Name:	hum_TRICAREManagedCareSupportContractTermWithOptionExercises
Namespace Prefix:	hum_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_MajorCustomersAxis=hum_MedicareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=hum_MedicaidMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=hum_MilitaryServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: