Affordable Care Act - Additional information (Details) $ in Millions	9 Months Ended
Sep. 30, 2023 USD ($)
Affordable Care Act [Abstract]
Risk adjustment, increase to net receivables	$ 244
Risk adjustment and reinsurance pre-tax benefit	$ 198

Affordable Care Act, Risk Adjustment And Reinsurance, Pre-Tax Expense (Benefit)

No definition available.

Name:	cnc_AffordableCareActRiskAdjustmentAndReinsurancePreTaxExpenseBenefit
Namespace Prefix:	cnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration