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Fair Value Measurements - Separate Account Assets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financial assets and financial liabilities carried at fair value [Line Items]    
Guaranteed separate accounts $ 530ci_GuaranteedSeparateAccountAssets $ 548ci_GuaranteedSeparateAccountAssets
Non-guaranteed separate accounts 7,798ci_NonGuaranteedSeparateAccountAssets [1] 7,704ci_NonGuaranteedSeparateAccountAssets [2]
Total separate account assets 8,328us-gaap_SeparateAccountAssets 8,252us-gaap_SeparateAccountAssets
Separate Account Assets [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,035us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
1,005us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Policyholder gains (losses) 85ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisSeparateAccountAssetPolicyholderGainsLosses
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
[3] 82ci_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisSeparateAccountAssetPolicyholderGainsLosses
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
[3]
Purchases, issuances, settlements:    
Purchases 266us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
173us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Sales (2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
(14)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Settlements (226)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
(209)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Total purchases, sales, settlements 38us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
(50)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Transfers into/(out of) Level 3:    
Transfers into Level 3 20us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Transfers out of Level 3 (20)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
(7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Total transfers into/(out of) Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
(2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Ending Balance 1,158us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
1,035us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Policyholder Gains Losses Attributable To Instruments Still Held 85ci_PolicyholderGainsLossesAttributableToInstrumentsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
76ci_PolicyholderGainsLossesAttributableToInstrumentsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= ci_SeparateAccountAssetsMember
Pension Benefits [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Non-guaranteed separate accounts 3,800ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
3,800ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Fair Value Inputs Level 1 [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Guaranteed separate accounts 242ci_GuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
264ci_GuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Non-guaranteed separate accounts 1,609ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
1,844ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Total separate account assets 1,851us-gaap_SeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
2,108us-gaap_SeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value Inputs Level 2 [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Guaranteed separate accounts 288ci_GuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
284ci_GuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Non-guaranteed separate accounts 5,031ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
4,825ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Total separate account assets 5,319us-gaap_SeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
5,109us-gaap_SeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value Inputs Level 3 [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Guaranteed separate accounts 0ci_GuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0ci_GuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Non-guaranteed separate accounts 1,158ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,035ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Total separate account assets 1,158us-gaap_SeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,035us-gaap_SeparateAccountAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value Inputs Level 3 [Member] | Pension Benefits [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Non-guaranteed separate accounts $ 1,100ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 983ci_NonGuaranteedSeparateAccountAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1] As of December 31, 2014, non-guaranteed separate accounts included $3.8 billion in assets supporting the Company's pension plans, including $1.1 billion classified in Level 3.
[2] As of December 31, 2013, non-guaranteed separate accounts included $3.8 billion in assets supporting the Company's pension plans, including $983 million classified in Level 3.
[3] Included in this amount were gains of $85 million attributable to instruments still held at December 31, 2014 and gains of $76 million attributable to instruments still held at December 31, 2013.