Debt Instrument, Extension Term

No definition available.

Name:	ci_DebtInstrumentExtensionTerm
Namespace Prefix:	ci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Accordion Feature, Incremental Increase In Maximum Borrowing Capacity

+ References

No definition available.

+ Details

Name:	ci_LineOfCreditFacilityAccordionFeatureIncrementalIncreaseInMaximumBorrowingCapacity
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line Of Credit Facility, Conversion To Term Loan, Term

+ References

No definition available.

+ Details

Name:	ci_LineOfCreditFacilityConversionToTermLoanTerm
Namespace Prefix:	ci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The debt-to adjusted capital ratio which the Company must not exceed in accordance with the terms of the line of credit facility agreement.

+ References

No definition available.

+ Details

Name:	ci_LineOfCreditFacilityDebtToAdjustedCapitalRatioCovenant
Namespace Prefix:	ci_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Maximum Borrowing Capacity And Accordion Feature, Incremental Increase In Maximum Borrowing Capacity

+ References

No definition available.

+ Details

Name:	ci_LineOfCreditFacilityMaximumBorrowingCapacityAndAccordionFeatureIncrementalIncreaseInMaximumBorrowingCapacity
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of banks participating in revolving credit and letter of credit agreement

+ References

No definition available.

+ Details

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

- Definition

Number Of Revolving Credit Facility

+ References

No definition available.

+ Details

Name:	ci_NumberOfRevolvingCreditFacility
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

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69F
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69E
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1F
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611

+ Details

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ci_RevolvingCreditAgreementsApril2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ci_RevolvingCreditAndLetterOfCreditFacilityMaturingApril2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ci_A364DayRevolvingCreditAgreementMaturingApril2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ci_RevolvingCreditAndLetterOfCreditFacilityMaturingApril2027RevolvingCreditFacilityMaturingApril2025And364DayRevolvingCreditAgreementMaturingApril2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ci_RevolvingCreditAndLetterOfCreditFacilityMaturingApril2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ci_RevolvingCreditFacilityMaturingApril2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ci_A364DayRevolvingCreditAgreementMaturingApril2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Narrative (Details)	1 Months Ended		3 Months Ended
Debt - Narrative (Details)	Apr. 30, 2023 USD ($) revolvingCreditFacility position	Apr. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Debt Instrument [Line Items]
Interest expense on long-term and short-term debt			$ 345,000,000	$ 314,000,000
Commercial Paper
Debt Instrument [Line Items]
Maximum borrowing capacity			5,000,000,000
Outstanding balances			0
Revolving credit agreements, April 2023
Debt Instrument [Line Items]
Number of revolving credit facilities \| revolvingCreditFacility	2
Revolving credit agreements, April 2023 \| Subsequent Event
Debt Instrument [Line Items]
Aggregate amount of options to increase commitments	$ 1,500,000,000
Maximum total commitment	$ 6,500,000,000
Number of participating banks \| position	21
Leverage ratio covenant	60.00%
Five-year Revolving Credit Agreement, Maturing April 2028 \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 4,000,000,000
Credit agreement term	5 years
Credit agreement extension term	1 year
Five-year Revolving Credit Agreement, Maturing April 2028 \| Letter of Credit \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000
364-day Revolving Credit Agreement, Maturing April 2024 \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000,000,000
Credit agreement term	364 days
Credit facility, conversion to term loan, term	1 year
Revolving credit agreements, April 2022
Debt Instrument [Line Items]
Outstanding balances			$ 0
Revolving Credit And Letter Of Credit Facility Maturing April 2027
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 3,000,000,000
Credit agreement term		5 years
Revolving Credit Facility Maturing April 2025
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,000,000,000
Credit agreement term		3 years
364 Day Revolving Credit Agreement, Maturing April 2023
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,000,000,000
Credit agreement term		364 days