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Derivative Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Derivatives, Fair Value [Line Items]      
Maximum term length, investment cash flow hedges 6 years    
Gains (losses) reclassified from other comprehensive income into income        
Amounts excluded from assessment of hedge effectiveness 0us-gaap_GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet 0us-gaap_GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet  
Gains (losses) recognized due to hedge ineffectiveness 0us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet 0us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet  
Cash on deposit representing upfront margin required by clearinghouse 22ci_MarginDeposits    
Net liability position of derivatives that contain certain credit risk-related contingent features        
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivatives, Fair Value [Line Items]      
Notional Amount 145invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  145invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Gain (Loss) Recognized in Other Comprehensive Income        
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Long Term Investments Location [Member]      
Derivatives, Fair Value [Line Items]      
Fair Value        
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Accounts Payable Accrued Expenses And Other Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair Value        
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member]      
Derivatives, Fair Value [Line Items]      
Notional Amount 750invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  750invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Income Statement impact of fair value hedges        
Balance Sheet impact of fair value hedge assets