v2.4.1.9

Condensed Financial Information Of Registrant (Condensed Statements Of Operations) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
General and administrative expenses |  |  |  |  |  |  |  |  | $ 1,314 us-gaap_GeneralAndAdministrativeExpense | $ 931 us-gaap_GeneralAndAdministrativeExpense | $ 677 us-gaap_GeneralAndAdministrativeExpense
Investment and other income |  |  |  |  |  |  |  |  | 28 us-gaap_InvestmentIncomeNonoperating | 19 us-gaap_InvestmentIncomeNonoperating | 35 us-gaap_InvestmentIncomeNonoperating
Interest Expense |  |  |  |  |  |  |  |  | (35)us-gaap_InterestExpense | (27)us-gaap_InterestExpense | (20)us-gaap_InterestExpense
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 457 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 269 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 123 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense |  |  |  |  |  |  |  |  | 196 us-gaap_IncomeTaxExpenseBenefit | 107 us-gaap_IncomeTaxExpenseBenefit | 47 us-gaap_IncomeTaxExpenseBenefit
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | 6 us-gaap_IncomeLossFromEquityMethodInvestments |  |
Net earnings (loss) before equity in subsidiaries |  |  |  |  |  |  |  |  | 264 us-gaap_ProfitLoss | 166 us-gaap_ProfitLoss | (11)us-gaap_ProfitLoss
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 7 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 13 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Income (Loss) from Continuing Operations Attributable to Parent | 106 us-gaap_IncomeLossFromContinuingOperations | 81 us-gaap_IncomeLossFromContinuingOperations | 47 us-gaap_IncomeLossFromContinuingOperations | 34 us-gaap_IncomeLossFromContinuingOperations | 48 us-gaap_IncomeLossFromContinuingOperations | 50 us-gaap_IncomeLossFromContinuingOperations | 41 us-gaap_IncomeLossFromContinuingOperations | 23 us-gaap_IncomeLossFromContinuingOperations | 268 us-gaap_IncomeLossFromContinuingOperations | 161 us-gaap_IncomeLossFromContinuingOperations | 89 us-gaap_IncomeLossFromContinuingOperations
Basic earnings (loss) per common share (in dollars per share) | $ 0.91 us-gaap_EarningsPerShareBasic | $ 0.70 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.48 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 2.33 us-gaap_EarningsPerShareBasic | $ 1.52 us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per common share (in dollars per share) | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 0.43 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 2.25 us-gaap_EarningsPerShareDiluted | $ 1.47 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted
Basic |  |  |  |  |  |  |  |  | 116,345,764 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 108,253,090 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 103,018,732 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted |  |  |  |  |  |  |  |  | 120,360,212 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 112,494,346 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 107,428,750 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 3 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment and other income |  |  |  |  |  |  |  |  | 1 us-gaap_InvestmentIncomeNonoperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_InvestmentIncomeNonoperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20 us-gaap_InvestmentIncomeNonoperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest Expense |  |  |  |  |  |  |  |  | (30)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (23)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (16)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | (32)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (26)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax expense |  |  |  |  |  |  |  |  | (8)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (15)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (10)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
net income (loss), including portion attributable to noncontrolling interest before equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | (24)cnc_Netincomelossincludingportionattributabletononcontrollinginterestbeforeequityinearningsfromsubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11)cnc_Netincomelossincludingportionattributabletononcontrollinginterestbeforeequityinearningsfromsubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10 cnc_Netincomelossincludingportionattributabletononcontrollinginterestbeforeequityinearningsfromsubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | 285 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 173 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 66 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net earnings (loss) before equity in subsidiaries |  |  |  |  |  |  |  |  | 261 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 162 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 76 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 7 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | $ 268 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 161 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 89 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Basic earnings (loss) per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.30 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1.49 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0.86 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Diluted earnings (loss) per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.23 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1.43 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0.83 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Basic |  |  |  |  |  |  |  |  | 116,345,764 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 108,253,090 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 103,018,732 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Diluted |  |  |  |  |  |  |  |  | 120,360,212 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 112,494,346 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 107,428,750 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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