v2.4.1.9

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
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jul. 31, 2014 Ribera Salud [Member] USD ($) | Dec. 31, 2014 Ribera Salud [Member] USD ($) | Dec. 31, 2014 Ribera Salud [Member] EUR (€) | Jul. 31, 2014 Community Health Solutions [Member] USD ($) | Apr. 30, 2013 Acaria Health [Member] USD ($) | Jan. 31, 2014 U.S. Medical Management [Member] USD ($) | Dec. 31, 2014 U.S. Medical Management [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest | $ 148 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount | $ 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  |  |  |  |  |  |  | $ 148 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember
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 |
Total consideration |  |  |  |  |  |  | 134 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember | 142 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember | 213 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  |  |  |  | 58 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember | 75 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember | 133 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Business acquisition, cash paid |  |  |  |  |  |  | 56 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember | 67 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember | 80 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Business Combination, Total Fair Value |  |  |  |  |  |  |  |  | 352 cnc_BusinessCombinationTotalFairValue / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Redeemable Noncontrolling Interest, Equity, Fair Value |  |  |  |  |  |  |  |  | 139 us-gaap_RedeemableNoncontrollingInterestEquityFairValue / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Acquisition of additional ownership | 0 us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries | 0 us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries | 14 us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries |  |  |  |  |  |  |
Goodwill | 754 us-gaap_Goodwill | 348 us-gaap_Goodwill | 256 us-gaap_Goodwill |  |  |  | 125 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember | 92 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember | 280 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | 9 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember | 35 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember | 78 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  |  |  | 1,492,738 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember | 3,433,380 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember | 4,486,434 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  | 20 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  | 28 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = cnc_CommunityHealthSolutionsMember |  |  |
Net deferred tax assests | 144 us-gaap_DeferredTaxAssetsNet | 100 us-gaap_DeferredTaxAssetsNet |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  | 685,280 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |  |
Stock Issued During Period, Value, New Issues |  | 15 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  | 15 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_BusinessAcquisitionAxis = cnc_AcariaHealthMember |  |
Letters of Credit Outstanding, Amount |  |  |  |  | 58 us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = cnc_RiberaSaludMember | 48 us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = cnc_RiberaSaludMember |  |  |  |
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 |
Payments to Acquire Interest in Joint Venture |  |  |  | 17 us-gaap_PaymentsToAcquireInterestInJointVenture / dei_LegalEntityAxis = cnc_RiberaSaludMember |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = cnc_RiberaSaludMember |  |  |  |  |  |
Percent of future consideration issuable in shares |  |  |  |  |  |  |  |  | 50.00%cnc_Percentoffutureconsiderationissuableinshares / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember |
Proceeds from Noncontrolling Interests |  |  |  |  |  |  |  |  |  | 6 us-gaap_ProceedsFromMinorityShareholders / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember
Reclassification to redeemable noncontrolling interest | 9 cnc_Reclassificationtoredeemablenoncontrollinginterest | 0 cnc_Reclassificationtoredeemablenoncontrollinginterest | 0 cnc_Reclassificationtoredeemablenoncontrollinginterest |  |  |  |  |  |  |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ (6)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = cnc_U.S.MedicalManagementMember

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + 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 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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Balance Type: | credit
Period Type: | duration