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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Swap
Dec. 31, 2014
Fair Value Measurements [Abstract]    
Derivative financial instruments, fair value, net $ 174.8us-gaap_DerivativeFairValueOfDerivativeNet  
Derivative fair value of net asset if commodity price increases by 10 percent 132.7trgp_DerivativeFairValueOfAssetLiabilityNetIfCommodityPriceIncreasesBy10Percent  
Derivative fair value of net asset if commodity price decreases by 10 percent 199.2trgp_DerivativeFairValueOfAssetLiabilityNetIfCommodityPriceDecreasesBy10Percent  
Number of natural gas basis swaps categorized as Level 3 13trgp_NumberOfNaturalGasBasisSwapsCategorizedAsLevel3  
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value [Abstract]    
Assets from commodity derivative contracts 174.8us-gaap_DerivativeAssets [1] 55.8us-gaap_DerivativeAssets
Liabilities from commodity derivative contracts 0us-gaap_DerivativeLiabilities [1] 0.8us-gaap_DerivativeLiabilities
Commodity Derivative Contracts (Asset) / Liability [Member]    
Fair Value, Liabilities/Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period (1.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
 
Settlements included in Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
 
Unrealized gain included in OCI (1.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
 
Transfers into Level 3 (0.6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
 
Transfers out of Level 3 (0.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
 
Balance, end of period (3.5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
 
Level 1 [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value [Abstract]    
Assets from commodity derivative contracts 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
[1]  
Liabilities from commodity derivative contracts 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
[1]  
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 1 [Member] | TRC Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_TrcSeniorSecuredRevolvingCreditFacilityDue2017Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 1 [Member] | Senior Secured Term Loan [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_SeniorSecuredTermLoanMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 1 [Member] | Partnership's Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSSeniorSecuredCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 1 [Member] | Partnership's Senior Unsecured Notes [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 1 [Member] | Partnership's Accounts Receivable Securitization Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 197.9us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSAccountsReceivableSecuritizationFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 2 [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value [Abstract]    
Assets from commodity derivative contracts 172.9us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[1]  
Liabilities from commodity derivative contracts 1.6us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[1]  
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Level 2 [Member] | TRC Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 460.0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_TrcSeniorSecuredRevolvingCreditFacilityDue2017Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Level 2 [Member] | Senior Secured Term Loan [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 243.1us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_SeniorSecuredTermLoanMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Level 2 [Member] | Partnership's Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 840.0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSSeniorSecuredCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Level 2 [Member] | Partnership's Senior Unsecured Notes [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 4,384.9us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Level 2 [Member] | Partnership's Accounts Receivable Securitization Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSAccountsReceivableSecuritizationFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Level 3 [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value [Abstract]    
Assets from commodity derivative contracts 4.3us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1]  
Liabilities from commodity derivative contracts 0.8us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1]  
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Level 3 [Member] | TRC Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_TrcSeniorSecuredRevolvingCreditFacilityDue2017Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Level 3 [Member] | Senior Secured Term Loan [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_SeniorSecuredTermLoanMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Level 3 [Member] | Partnership's Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSSeniorSecuredCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Level 3 [Member] | Partnership's Senior Unsecured Notes [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Level 3 [Member] | Partnership's Accounts Receivable Securitization Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSAccountsReceivableSecuritizationFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Carrying Value [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value [Abstract]    
Assets from commodity derivative contracts 177.2us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1]  
Liabilities from commodity derivative contracts 2.4us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1]  
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Cash and cash equivalents 170.7us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Carrying Value [Member] | TRC Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 460.0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_TrcSeniorSecuredRevolvingCreditFacilityDue2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Carrying Value [Member] | Senior Secured Term Loan [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 237.8us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_SeniorSecuredTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Carrying Value [Member] | Partnership's Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 840.0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSSeniorSecuredCreditFacilityMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Carrying Value [Member] | Partnership's Senior Unsecured Notes [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 4,300.4us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Carrying Value [Member] | Partnership's Accounts Receivable Securitization Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 197.9us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSAccountsReceivableSecuritizationFacilityMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Fair Value [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value [Abstract]    
Assets from commodity derivative contracts 177.2us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]  
Liabilities from commodity derivative contracts 2.4us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]  
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Cash and cash equivalents 170.7us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Fair Value [Member] | TRC Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 460.0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_TrcSeniorSecuredRevolvingCreditFacilityDue2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Fair Value [Member] | Senior Secured Term Loan [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 243.1us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_SeniorSecuredTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Fair Value [Member] | Partnership's Senior Secured Revolving Credit Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 840.0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSSeniorSecuredCreditFacilityMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Fair Value [Member] | Partnership's Senior Unsecured Notes [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt 4,384.9us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Fair Value [Member] | Partnership's Accounts Receivable Securitization Facility [Member]    
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract]    
Long-term debt $ 197.9us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= trgp_PartnershipSAccountsReceivableSecuritizationFacilityMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
[1] The fair value of the derivative contracts in this table is presented on a different basis than the Consolidated Balance Sheets presentation as disclosed in Note 14. The above fair values reflect the total value of each derivative contract taken as a whole, whereas the Consolidated Balance Sheets presentation is based on the individual maturity dates of estimated future settlements. As such, an individual contract could have both an asset and liability position when segregated into its current and long-term portions for Consolidated Balance Sheets classification purposes.