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v3.25.4

Summary of Significant Accounting Policies - Premium and Trade Receivables and Unearned Revenue (Details) $ in Millions | Dec. 31, 2025 USD ($)
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Accounting Policies [Abstract] |
Stand-alone Part D risk-sharing programs receivable balance for the 2025 plan year | $ 3,992

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- Definition Stand-Alone Part D Risk-Sharing Programs Receivable + References No definition available. + Details
Name: | cnc_StandAlonePartDRiskSharingProgramsReceivable
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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