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Reinsurance - Effective Exit of GMDB and GMIB Business (Details) (Berkshire Hathway Life Insurance Company Of Nebraska [Member], Variable Annuity [Member], USD $)
In Billions, unless otherwise specified
Dec. 31, 2013
Ceded Credit Risk [Line Items]  
Percent of future claim payments reinsured 100.00%ci_CededReinsuranceAgreementReinsuredRiskPercentage
Maximum [Member] | Guaranteed Minimum Death Benefit [Member]
  
Ceded Credit Risk [Line Items]  
Ceded Reinsurance Agreement, Coverage Limit, Amount Remaining 3.7ci_CededReinsuranceAgreementCoverageLimitAmountRemaining
/ us-gaap_CededCreditRiskAxis
= ci_BerkshireHathwayLifeInsuranceCompanyOfNebraskaMember
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember