XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.7.0.1

HEALTH CARE REFORM (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Premium deficiency reserve |  | $ 176 |  |  | $ 0 |  | $ 176
Premium deficiency reserve, change in estimate |  |  | $ 208 | $ 13 |  |  |
Policyholder benefits and claims incurred, net, health, increase |  |  | 208 |  |  |  |
Write off of risk corridor receivables |  | 583 |  |  |  |  |
Other current assets |  | 3,438 |  |  | 3,884 |  | 3,438
Trade accounts payable and accrued expenses |  | (2,467) |  |  | (4,693) |  | (2,467)
Other long-term assets |  | 2,226 |  |  | 2,192 |  | 2,226
Other long-term liabilities |  | (263) |  |  | (417) |  | (263)
Risk Adjustment Settlement |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Total net (liability) asset |  | 196 |  |  | 143 |  | 196
Reinsurance Recoverables |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Total net (liability) asset |  | 260 |  |  | 268 |  | 260
Health Care Reform |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Payment of annual health insurance industry fee | $ 916 |  |  |  |  |  |
Amortization of deferred charges |  |  | $ 229 |  |  | $ 456 |
2014 Coverage Year |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Increase (decrease) in premiums receivable |  |  |  |  |  |  | (38)
2015 Coverage Year |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Proceeds from reinsurance recoverable |  |  |  |  | 60 | 214 |
Proceeds from risk adjustment settlements |  |  |  |  | 3 | $ 8 |
2014 and 2015 ACA Products |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Write off of risk corridor receivables |  | 415 |  |  |  |  |
2016 Coverage Year | Risk Adjustment Settlement |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Premiums receivable |  | 307 |  |  | 291 |  | 307
Other current assets |  | 0 |  |  | 0 |  | 0
Trade accounts payable and accrued expenses |  | (117) |  |  | (150) |  | (117)
Net current asset |  | 190 |  |  | 141 |  | 190
Other long-term assets |  | 6 |  |  | 0 |  | 6
Total net (liability) asset |  | 196 |  |  | 141 |  | 196
2016 Coverage Year | Reinsurance Recoverables |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Premiums receivable |  | 0 |  |  | 0 |  | 0
Other current assets |  | 260 |  |  | 268 |  | 260
Trade accounts payable and accrued expenses |  | 0 |  |  | 0 |  | 0
Net current asset |  | 260 |  |  | 268 |  | 260
Other long-term assets |  | 0 |  |  | 0 |  | 0
Total net (liability) asset |  | 260 |  |  | 268 |  | 260
Current Coverage Year | Risk Adjustment Settlement |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Premiums receivable |  | 0 |  |  | 12 |  | 0
Net current asset |  | 0 |  |  | 12 |  | 0
Other long-term assets |  | 0 |  |  | 30 |  | 0
Other long-term liabilities |  | 0 |  |  | (40) |  | 0
Net long-term liability |  | 0 |  |  | (10) |  | 0
Total net (liability) asset |  | 0 |  |  | 2 |  | 0
Current Coverage Year | Reinsurance Recoverables |  |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |  |
Premiums receivable |  | 0 |  |  | 0 |  | 0
Net current asset |  | 0 |  |  | 0 |  | 0
Other long-term assets |  | 0 |  |  | 0 |  | 0
Other long-term liabilities |  | 0 |  |  | 0 |  | 0
Net long-term liability |  | 0 |  |  | 0 |  | 0
Total net (liability) asset |  | $ 0 |  |  | $ 0 |  | $ 0

X
- Definition Health Care Reform, Premium Deficiency Reserve + References No definition available. + Details
Name: | hum_HealthCareReformPremiumDeficiencyReserve
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Health Care Reform, Premium Deficiency Reserve, Change In Estimate + References No definition available. + Details
Name: | hum_HealthCareReformPremiumDeficiencyReserveChangeInEstimate
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net Asset (Liability) + References No definition available. + Details
Name: | hum_NetAssetLiability
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net current (liability) asset + References No definition available. + Details
Name: | hum_NetCurrentLiabilityAsset
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Noncurrent Asset (Liability) + References No definition available. + Details
Name: | hum_NetNoncurrentAssetLiability
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Payment Of Annual Health Insurance Industry Fee + References No definition available. + Details
Name: | hum_PaymentOfAnnualHealthInsuranceIndustryFee
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Policyholder Benefits and Claims Incurred, Net, Health, Increase (Decrease) + References No definition available. + Details
Name: | hum_PolicyholderBenefitsandClaimsIncurredNetHealthIncreaseDecrease
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Premiums Reduction, Write Off Of Risk Corridor Receivables + References No definition available. + Details
Name: | hum_PremiumsReductionWriteOffOfRiskCorridorReceivables
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds From Reinsurance Recoverable + References No definition available. + Details
Name: | hum_ProceedsFromReinsuranceRecoverable
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds From Risk Adjustment Settlements + References No definition available. + Details
Name: | hum_ProceedsFromRiskAdjustmentSettlements
Namespace Prefix: | hum_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of amortization of deferred charges applied against earnings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_AmortizationOfDeferredCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The change in the premium receivable balance on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInPremiumsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of current assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherLiabilitiesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_PremiumsReceivableAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_SupplementaryInsuranceInformationBySegmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | hum_RegulatoryMattersAxis=hum_HealthCareReformMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=hum_A2014ACAProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=hum_A2015ACAProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=hum_A2014And2015ACAProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=hum_A2016ACAProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=hum_A2017ACAProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |