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Acquisitions and Noncontrolling Interest Acquisitions (Details)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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Dec. 31, 2012
USD ($)
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Jul. 31, 2014
Ribera Salud [Member]
USD ($)
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Dec. 31, 2014
Ribera Salud [Member]
USD ($)
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Dec. 31, 2014
Ribera Salud [Member]
EUR (€)
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Jul. 31, 2014
Community Health Solutions [Member]
USD ($)
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Apr. 30, 2013
Acaria Health [Member]
USD ($)
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Jan. 31, 2014
U.S. Medical Management [Member]
USD ($)
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Dec. 31, 2014
U.S. Medical Management [Member]
USD ($)
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| Business Acquisition [Line Items] | ||||||||||
| Redeemable noncontrolling interest | $ 148us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount | $ 0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount | $ 148us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Business Acquisition, Percentage of Voting Interests Acquired | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
68.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Total consideration | 134us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
142us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
213us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 58us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
75us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
133us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Business acquisition, cash paid | 56us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
67us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
80us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Business Combination, Total Fair Value | 352cnc_BusinessCombinationTotalFairValue / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Redeemable Noncontrolling Interest, Equity, Fair Value | 139us-gaap_RedeemableNoncontrollingInterestEquityFairValue / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Acquisition of additional ownership | 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries | 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries | 14us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries | |||||||
| Goodwill | 754us-gaap_Goodwill | 348us-gaap_Goodwill | 256us-gaap_Goodwill | 125us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
92us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
280us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
35us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
78us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Stock Issued During Period, Shares, Acquisitions | 1,492,738us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
3,433,380us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
4,486,434us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Business Combination, Contingent Consideration, Liability | 20us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
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| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 28us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
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| Net deferred tax assests | 144us-gaap_DeferredTaxAssetsNet | 100us-gaap_DeferredTaxAssetsNet | ||||||||
| Stock Issued During Period, Shares, New Issues | 685,280us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
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| Stock Issued During Period, Value, New Issues | 15us-gaap_StockIssuedDuringPeriodValueNewIssues | 15us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |
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| Letters of Credit Outstanding, Amount | 58us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = cnc_RiberaSaludMember |
48us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = cnc_RiberaSaludMember |
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| Percent of goodwill deductible for tax purposes | 100.00%cnc_Percentofgoodwilldeductiblefortaxpurposes / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |
45.00%cnc_Percentofgoodwilldeductiblefortaxpurposes / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Payments to Acquire Interest in Joint Venture | 17us-gaap_PaymentsToAcquireInterestInJointVenture / dei_LegalEntityAxis = cnc_RiberaSaludMember |
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| Equity Method Investment, Ownership Percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = cnc_RiberaSaludMember |
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| Percent of future consideration issuable in shares | 50.00%cnc_Percentoffutureconsiderationissuableinshares / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Proceeds from Noncontrolling Interests | 6us-gaap_ProceedsFromMinorityShareholders / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| Reclassification to redeemable noncontrolling interest | 9cnc_Reclassificationtoredeemablenoncontrollinginterest | 0cnc_Reclassificationtoredeemablenoncontrollinginterest | 0cnc_Reclassificationtoredeemablenoncontrollinginterest | |||||||
| Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | $ (6)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
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| X | ||||||||||
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- Definition
Business Combination, Total Fair Value No definition available.
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| X | ||||||||||
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- Definition
Percent of future consideration issuable in shares No definition available.
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| X | ||||||||||
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- Definition
The percent of goodwill arising from a business combination that is expected to be deductible for tax purposes. No definition available.
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| X | ||||||||||
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- Definition
Reclassification to redeemable noncontrolling interest No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Percentage of voting equity interests acquired at the acquisition date in the business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of liability recognized arising from contingent consideration in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of identifiable intangible assets recognized as of the acquisition date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
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| X | ||||||||||
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- Definition
Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow associated with the purchase of noncontrolling interest during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of stock issued during the period pursuant to acquisitions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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