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

Other impairments on investments primarily represents the impact of rising market yields on investments where the Company will more likely than note be required to sell.

No definition available.

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

Total impairments recorded in realized investment losses

No definition available.

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

- Details

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

The net realized gains or (losses) on investments during the period, including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

No definition available.

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

Amount after taxes of the net realized gains or (losses) on investments during the period.

No definition available.

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

Amount of tax expense (benefit) on net realized gains or losses on investments during the period.

No definition available.