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Summary of Significant Accounting Policies - Premium and Trade Receivables and Unearned Revenue (Details) $ in Millions	Dec. 31, 2025 USD ($)
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