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Debt - Debt Repurchase Program (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2022
Debt Disclosure [Abstract]
Debt repurchase program, authorized amount			$ 1,000,000,000
Debt redemption amount	$ 0	$ 0
Remaining amount available under the program	$ 700,000,000

X

- Definition

Debt Repurchase Program, Authorized Amount

+ References

No definition available.

+ Details

Name:	cnc_DebtRepurchaseProgramAuthorizedAmount
Namespace Prefix:	cnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt Repurchase Program, Remaining Amount Authorized to be Repurchased, Amount

+ References

No definition available.

+ Details

Name:	cnc_DebtRepurchaseProgramRemainingAmountAuthorizedToBeRepurchasedAmount
Namespace Prefix:	cnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant