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Income Taxes - Reconciliation to Nominal Tax Rate (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]      
Nominal federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Reconciliation of total taxes to nominal federal rate details [Abstract]      
Tax expense at nominal rate $ 1,156us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 761us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 867us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effect of undistributed foreign earnings (74)ci_IncomeTaxReconciliationPermanentlyReinvestedForeignEarnings (42)ci_IncomeTaxReconciliationPermanentlyReinvestedForeignEarnings (37)ci_IncomeTaxReconciliationPermanentlyReinvestedForeignEarnings
Health insurance industry tax 83ci_IncomeTaxReconciliationHealthInsuranceIndustryTax 0ci_IncomeTaxReconciliationHealthInsuranceIndustryTax 0ci_IncomeTaxReconciliationHealthInsuranceIndustryTax
State income tax (net of federal income tax benefit) 25us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 27us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 28us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other 20us-gaap_IncomeTaxReconciliationOtherReconcilingItems (48)us-gaap_IncomeTaxReconciliationOtherReconcilingItems (5)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total taxes $ 1,210us-gaap_IncomeTaxExpenseBenefit $ 698us-gaap_IncomeTaxExpenseBenefit $ 853us-gaap_IncomeTaxExpenseBenefit