XML 64 R53.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Guarantees and Contingencies - Additional Information (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2016 region
New Tricare South Region Contract |
Loss Contingencies [Line Items] |
Contract term, years | 5 years
Contract expiration date | Mar. 31, 2017
Total Medicare |
Loss Contingencies [Line Items] |
Percentage of premiums and services revenue | 74.00%
Military services |
Loss Contingencies [Line Items] |
Percentage of premiums and services revenue | 1.00%
Number of regions | 3
Number of regions after proposed consolidation | 2
Medicaid |
Loss Contingencies [Line Items] |
Percentage of premiums and services revenue | 5.00%

X
- Definition Contract Expiration Date + References No definition available. + Details
Name: | hum_ContractExpirationDate
Namespace Prefix: | hum_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contract term, years. + References No definition available. + Details
Name: | hum_ContractTermYears
Namespace Prefix: | hum_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Regions + References No definition available. + Details
Name: | hum_NumberOfRegions
Namespace Prefix: | hum_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Regions After Proposed Consolidation + References No definition available. + Details
Name: | hum_NumberOfRegionsAfterProposedConsolidation
Namespace Prefix: | hum_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Total Premium And Services Revenues + References No definition available. + Details
Name: | hum_PercentageOfTotalPremiumAndServicesRevenues
Namespace Prefix: | hum_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Details
Name: | us-gaap_StatementGeographicalAxis=hum_NewTricareSouthRegionContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hum_MedicareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hum_MilitaryServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hum_MedicaidMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |