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FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jul. 24, 2012
Mar. 31, 2014
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Accumulated net loss from designated or qualifying cash flow hedges $ 15dgx_AccumulatedNetGainLossfromDesignatedorQualifyingCashFlowHedges
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
$ 5dgx_AccumulatedNetGainLossfromDesignatedorQualifyingCashFlowHedges
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
   
Net amount of deferred gains and losses on cash flow hedges that is expected to be reclassified within the next 12 months 1us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Interest Rate Swaps [Member]        
Derivative [Line Items]        
Derivative asset designated as hedging instrument fair value on termination     72dgx_DerivativeAssetDesignatedAsHedgingInstrumentFairValueOnTermination
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
 
Amount to be amortized as a reduction of interest expense     65us-gaap_DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
 
Treasury Lock [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Derivative, notional amount       175invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Interest Rate Swaps [Member] | Forward Contracts [Member]        
Derivative [Line Items]        
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge 10 years      
Derivative, notional amount $ 150invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 100invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
   
Interest Rate Swaps [Member] | Forward Contracts [Member] | Minimum [Member]        
Derivative [Line Items]        
Derivative, Term of Contract 21 months      
Derivative, Fixed Interest Rate 3.57%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Interest Rate Swaps [Member] | Forward Contracts [Member] | Maximum [Member]        
Derivative [Line Items]        
Derivative, Term of Contract 24 months      
Derivative, Fixed Interest Rate 3.79%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember