XML 78 R61.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Fair Value Measurements - Fair Value Measurements By Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 5,342 | $ 4,072
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 247 | 195
Corporate securities | 3,146 | 2,210
Municipal securities | 2,187 | 2,087
Asset-backed securities | 683 | 437
Total investments | 7,068 | 5,532
Restricted deposits available for sale: |  |
Cash and cash equivalents | 8 | 17
Certificates of deposit | 433 | 4
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 114 | 114
Total restricted deposits | 555 | 135
Other long-term assets: |  |
Interest rate swap agreements |  | 1
Total assets at fair value | 12,965 | 9,740
Liabilities |  |
Interest rate swap agreements | 95 | 72
Total liabilities at fair value | 95 | 72
Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 444 | 332
Commercial mortgage- backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 361 | 271
Level I |  |
Assets |  |
Cash and cash equivalents | 5,342 | 4,072
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 247 | 195
Corporate securities | 0 | 0
Municipal securities | 0 | 0
Asset-backed securities | 0 | 0
Total investments | 247 | 195
Restricted deposits available for sale: |  |
Cash and cash equivalents | 8 | 17
Certificates of deposit | 0 | 4
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 114 | 114
Total restricted deposits | 122 | 135
Other long-term assets: |  |
Interest rate swap agreements |  | 0
Total assets at fair value | 5,711 | 4,402
Liabilities |  |
Interest rate swap agreements | 0 | 0
Total liabilities at fair value | 0 | 0
Level I | Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 0 | 0
Level I | Commercial mortgage- backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 0 | 0
Level II |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Corporate securities | 3,146 | 2,210
Municipal securities | 2,187 | 2,087
Asset-backed securities | 683 | 437
Total investments | 6,821 | 5,337
Restricted deposits available for sale: |  |
Cash and cash equivalents | 0 | 0
Certificates of deposit | 433 | 0
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Total restricted deposits | 433 | 0
Other long-term assets: |  |
Interest rate swap agreements |  | 1
Total assets at fair value | 7,254 | 5,338
Liabilities |  |
Interest rate swap agreements | 95 | 72
Total liabilities at fair value | 95 | 72
Level II | Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 444 | 332
Level II | Commercial mortgage- backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 361 | 271
Level III |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Corporate securities | 0 | 0
Municipal securities | 0 | 0
Asset-backed securities | 0 | 0
Total investments | 0 | 0
Restricted deposits available for sale: |  |
Cash and cash equivalents | 0 | 0
Certificates of deposit | 0 | 0
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Total restricted deposits | 0 | 0
Other long-term assets: |  |
Interest rate swap agreements |  | 0
Total assets at fair value | 0 | 0
Liabilities |  |
Interest rate swap agreements | 0 | 0
Total liabilities at fair value | 0 | 0
Level III | Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 0 | 0
Level III | Commercial mortgage- backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | $ 0 | $ 0

X
- Definition This element represents asset backed securities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | cnc_AssetBackedSecuritiesFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents restricted cash and cash equivalents reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | cnc_CashAndCashEquivalentsRestrictedFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents restricted certificates of deposit reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | cnc_CertificatesOfDepositRestrictedFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Corporate securities + References No definition available. + Details
Name: | cnc_CorporateSecuritiesFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Municipal Securities Fair Value Disclosure + References No definition available. + Details
Name: | cnc_MunicipalSecuritiesFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents total restricted deposits reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | cnc_TotalRestrictedDepositsFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents U.S. Treasury securities and obligations of U.S. government corporations and agencies reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | cnc_UsTreasurySecuritiesAndObligationsOfUsGovernmentCorporationsAndAgenciesFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents restricted U.S. Treasury securities and obligations of U.S. government corporations and agencies reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | cnc_UsTreasurySecuritiesAndObligationsOfUsGovernmentCorporationsAndAgenciesRestrictedFairValueDisclosure
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References No definition available. + Details
Name: | us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References No definition available. + Details
Name: | us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InterestRateDerivativesAtFairValueNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RestrictedCashAndInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |