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									$ 1,314us-gaap_GeneralAndAdministrativeExpense	$ 931us-gaap_GeneralAndAdministrativeExpense	$ 677us-gaap_GeneralAndAdministrativeExpense
Investment and other income									28us-gaap_InvestmentIncomeNonoperating	19us-gaap_InvestmentIncomeNonoperating	35us-gaap_InvestmentIncomeNonoperating
Interest Expense									(35)us-gaap_InterestExpense	(27)us-gaap_InterestExpense	(20)us-gaap_InterestExpense
Earnings (loss) before income taxes									457us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	269us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	123us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense									196us-gaap_IncomeTaxExpenseBenefit	107us-gaap_IncomeTaxExpenseBenefit	47us-gaap_IncomeTaxExpenseBenefit
Equity in earnings from subsidiaries									6us-gaap_IncomeLossFromEquityMethodInvestments
Net earnings (loss) before equity in subsidiaries									264us-gaap_ProfitLoss	166us-gaap_ProfitLoss	(11)us-gaap_ProfitLoss
Net Income (Loss) Attributable to Noncontrolling Interest									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									116,345,764us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	108,253,090us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	103,018,732us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted									120,360,212us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	112,494,346us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	107,428,750us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Parent Company [Member]
General and administrative expenses									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									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									(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	0us-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	10cnc_Netincomelossincludingportionattributabletononcontrollinginterestbeforeequityinearningsfromsubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in earnings from subsidiaries									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									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									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									$ 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)									$ 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)									$ 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									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									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

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Net income (loss), including portion attributable to noncontrolling interest before equity in earnings from subsidiaries

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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