Name:	ci_SpecialItemChargeBenefitAfterTaxLitigation
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	ci_SpecialItemChargeBenefitBeforeTaxLitigation
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Special Item Charge Benefit Tax Matters

No definition available.

Name:	ci_SpecialItemChargeBenefitTaxMatters
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Special Item Charge Benefit Tax Matters After Tax

No definition available.

Name:	ci_SpecialItemChargeBenefitTaxMattersAfterTax
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Special Item, Gain (Loss) On Sale Of Business, Before Taxes

No definition available.

Name:	ci_SpecialItemGainLossOnSaleOfBusinessBeforeTaxes
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Special Item, Gain (Loss) On Sale Of Business, Net Of Tax

No definition available.

Name:	ci_SpecialItemGainLossOnSaleOfBusinessNetOfTax
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Sum of before-tax tax amounts classified as special items, attributable to the parent. Special items are excluded from the calculation of 'adjusted income (loss) from operations' because management believes they are not representative of the underlying results of operations. This is generally because the nature and size of these matters are not indicative of our ongoing business operations.

No definition available.

Name:	ci_SpecialItemGainOrLossBeforeTaxAttributableToReportingEntity
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Sum of after-tax amounts classified as special items, attributable to the parent. Special items are excluded from the calculation of 'adjusted income (loss) from operations' because management believes they are not representative of the underlying results of operations. This is generally because the nature and size of these matters are not indicative of our ongoing business operations.

No definition available.

Name:	ci_SpecialItemGainOrLossNetOfTaxAttributableToReportingEntity
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Special Items. Increase (Decrease) To Revenues After Tax

No definition available.

Name:	ci_SpecialItems.IncreaseDecreaseToRevenuesAfterTax
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

Name:	ci_SpecialItemsAfterTaxAbstract
Namespace Prefix:	ci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	ci_SpecialItemsBeforeTaxAbstract
Namespace Prefix:	ci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Special Items. Increase (Decrease) To Revenues

No definition available.

Name:	ci_SpecialItemsIncreaseDecreaseToRevenues
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Pre-tax transaction-related costs primarily consisting of fees for legal, advisory and other professional services, as well as employee costs.

No definition available.

Name:	ci_TransactionRelatedCosts
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

After-tax transaction-related costs including the impact of tax benefits realized from termination of merger agreement. Transaction-related costs consist primarily of fees for legal, advisory and other professional services as well as employee costs.

No definition available.