Reinsurance Recoverables, Number Of Reinsurers

No definition available.

Name:	ci_ReinsuranceRecoverablesNumberOfReinsurers
Namespace Prefix:	ci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B

+ Details

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

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after allowance for credit loss, recoverable under reinsurance for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 7B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-7B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29G
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-29G

+ Details

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

- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479838/944-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477363/944-310-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-6

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-5

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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

- Definition

Amount of allowance for credit loss on reinsurance recoverable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477363/944-310-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479838/944-20-50-5

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_ReinsuranceRecoverablesAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477363/944-310-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-6

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-14

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-12

Reference 6: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479838/944-20-50-5

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-5

+ Details

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

- Details

Name:	us-gaap_StatementOfFinancialPositionLocationBalanceAxis=us-gaap_OtherAssetsNoncurrent
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CededCreditRiskCollateralizationAxis=ci_CededCreditRiskSecuredContractuallyRequiredFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CededCreditRiskCollateralizationAxis=ci_CededCreditRiskSecuredCollateralProvisionsExistThatMayMitigateRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CededCreditRiskCollateralizationAxis=us-gaap_CededCreditRiskUnsecuredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ci_CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSROAxis=ci_NationallyRecognizedStatisticalRatingOrganizationsNRSROBBBOrHigherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=ci_AcquisitionDispositionRunoffActivitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CededCreditRiskAxis=ci_LincolnNationalLifeInsuranceCompanyAndLincolnLifeAndAnnuityOfNewYorkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ReinsurerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=ci_ReinsuranceRecoverablesGrossAcquisitionDispositionRunoffActivitiesNationallyRecognizedStatisticalRatingOrganizationsBBBOrHigherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ci_CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSROAxis=ci_NationallyRecognizedStatisicalRatingOrganizationsNRSROAOrHigherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=ci_OngoingOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ci_CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSROAxis=ci_NationallyRecognizedStatisicalRatingOrganizationsNRSROBBBToBBBRatingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ci_CreditRatingNationallyRecognizedStatisticalRatingOrganizationNRSROAxis=ci_NationallyRecognizedStatisicalRatingOrganizationsNRSRONotRatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Reinsurance - Reinsurance Recoverables (Details) $ in Millions	6 Months Ended
	Jun. 30, 2026 USD ($) reinsurer	Jun. 30, 2025 USD ($)
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	$ 3,471
Allowance for uncollectible reinsurance	(22)
Market risk benefits	650	$ 822
Total reinsurance recoverables	4,099
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	117
Fair Value of Collateral Contractually Required to Meet or Exceed Carrying Value of Recoverable
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	346
Collateral provisions exist that may mitigate risk of credit loss
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	2,777
No Collateral
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	348
BBB+ equivalent and higher current ratings \| Acquisition, disposition or run-off activities
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	$ 3,054
Number of reinsurers \| reinsurer	6
BBB+ equivalent and higher current ratings \| Acquisition, disposition or run-off activities \| The Lincoln National Life Insurance Company And Lincoln Life And Annuity Of New York
Ceded Credit Risk [Line Items]
Number of reinsurers \| reinsurer	2
BBB+ equivalent and higher current ratings \| Acquisition, disposition or run-off activities \| The Lincoln National Life Insurance Company And Lincoln Life And Annuity Of New York \| Reinsurer Concentration Risk \| Reinsurance Recoverables, Gross, Acquisition Disposition Runoff Activities, Nationally Recognized Statistical Rating Organizations, BBB+ Or Higher
Ceded Credit Risk [Line Items]
Concentration percentage	77.00%
BBB+ equivalent and higher current ratings \| Acquisition, disposition or run-off activities \| Fair Value of Collateral Contractually Required to Meet or Exceed Carrying Value of Recoverable
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	$ 269
BBB+ equivalent and higher current ratings \| Acquisition, disposition or run-off activities \| Collateral provisions exist that may mitigate risk of credit loss
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	2,762
BBB+ equivalent and higher current ratings \| Acquisition, disposition or run-off activities \| No Collateral
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	23
A- equivalent and higher current ratings \| Ongoing operations
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	261
A- equivalent and higher current ratings \| Ongoing operations \| Fair Value of Collateral Contractually Required to Meet or Exceed Carrying Value of Recoverable
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	0
A- equivalent and higher current ratings \| Ongoing operations \| Collateral provisions exist that may mitigate risk of credit loss
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	5
A- equivalent and higher current ratings \| Ongoing operations \| No Collateral
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	256
BBB- to BBB+ equivalent current credit ratings \| Ongoing operations
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	64
BBB- to BBB+ equivalent current credit ratings \| Ongoing operations \| Fair Value of Collateral Contractually Required to Meet or Exceed Carrying Value of Recoverable
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	0
BBB- to BBB+ equivalent current credit ratings \| Ongoing operations \| Collateral provisions exist that may mitigate risk of credit loss
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	0
BBB- to BBB+ equivalent current credit ratings \| Ongoing operations \| No Collateral
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	64
Not rated \| Ongoing operations
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	86
Not rated \| Ongoing operations \| Fair Value of Collateral Contractually Required to Meet or Exceed Carrying Value of Recoverable
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	77
Not rated \| Ongoing operations \| Collateral provisions exist that may mitigate risk of credit loss
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	5
Not rated \| Ongoing operations \| No Collateral
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	4
Not rated \| Acquisition, disposition or run-off activities
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	6
Not rated \| Acquisition, disposition or run-off activities \| Fair Value of Collateral Contractually Required to Meet or Exceed Carrying Value of Recoverable
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	0
Not rated \| Acquisition, disposition or run-off activities \| Collateral provisions exist that may mitigate risk of credit loss
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	5
Not rated \| Acquisition, disposition or run-off activities \| No Collateral
Ceded Credit Risk [Line Items]
Reinsurance recoverables before market risk benefits	$ 1