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