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Table - Investment In Unconsolidated Affiliates (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 25, 2010
Sep. 30, 2014
Nov. 25, 2014
Feb. 28, 2014
Share of earnings of unconsolidated affiliates’ net income (loss)   $ 195us-gaap_IncomeLossFromEquityMethodInvestments $ 135us-gaap_IncomeLossFromEquityMethodInvestments $ 105us-gaap_IncomeLossFromEquityMethodInvestments        
Ownership in affiliate   20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage            
Line of Credit Facility, Maximum Borrowing Capacity   2,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity 1,200us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity       2,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity 1,500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Equity Interest pledged by Regency Energy Partners LP in Regency Intrastate Gas LP 49.99%rgp_EquityInterestpledgedbyRegencyEnergyPartnersLPinRegencyIntrastateGasLP              
Line of Credit Facility, Amount Outstanding   1,504us-gaap_LineOfCredit 510us-gaap_LineOfCredit          
HPC [Member]                
Equity Method Investment Excess Fair Value Over Book Value Adjustment Long Lived Assets         155rgp_EquityMethodInvestmentExcessFairValueOverBookValueAdjustmentLongLivedAssets
/ dei_LegalEntityAxis
= rgp_HpcMember
     
Contributions to unconsolidated affiliates   0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_HpcMember
0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_HpcMember
[1] 0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_HpcMember
       
Distributions of earnings received from unconsolidated affiliates   (48)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_HpcMember
(238)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_HpcMember
[1] (61)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_HpcMember
       
Share of earnings of unconsolidated affiliates’ net income (loss)   33us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_HpcMember
36us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_HpcMember
[1] 35us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_HpcMember
       
Amortization of excess fair value of investment (1)   (6)rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_HpcMember
[2] (6)rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_HpcMember
[1],[2] (6)rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_HpcMember
[2]        
Ownership in affiliate   49.99%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_HpcMember
           
Equity Method Investment Excess Fair Value Over Book Value Adjustment Not Attributed To Specific Assets         32rgp_EquityMethodInvestmentExcessFairValueOverBookValueAdjustmentNotAttributedToSpecificAssets
/ dei_LegalEntityAxis
= rgp_HpcMember
     
Line of Credit Facility, Maximum Borrowing Capacity 500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= rgp_HpcMember
             
Borrowing Amount for Return of Capital Distribution 370rgp_BorrowingAmountforReturnofCapitalDistribution
/ dei_LegalEntityAxis
= rgp_HpcMember
             
Line of Credit Facility, Amount Outstanding   450us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= rgp_HpcMember
           
Guarantor Obligations, Maximum Exposure, Undiscounted   225us-gaap_GuaranteeObligationsMaximumExposure
/ dei_LegalEntityAxis
= rgp_HpcMember
           
MEP [Member]                
Contributions to unconsolidated affiliates   175us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_MepMember
[3] 0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_MepMember
0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_MepMember
  175us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_MepMember
   
Distributions of earnings received from unconsolidated affiliates   (73)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_MepMember
[3] (72)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_MepMember
(75)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_MepMember
       
Share of earnings of unconsolidated affiliates’ net income (loss)   45us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MepMember
[3] 40us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MepMember
42us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MepMember
       
Amortization of excess fair value of investment (1)   0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_MepMember
[2],[3] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_MepMember
[2] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_MepMember
       
Ownership in affiliate   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_MepMember
           
Lone Star [Member]                
Contributions to unconsolidated affiliates   114us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_LoneStarMember
137us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_LoneStarMember
343us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_LoneStarMember
       
Distributions of earnings received from unconsolidated affiliates   (137)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_LoneStarMember
(79)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_LoneStarMember
(68)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_LoneStarMember
       
Share of earnings of unconsolidated affiliates’ net income (loss)   116us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_LoneStarMember
64us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_LoneStarMember
44us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_LoneStarMember
       
Amortization of excess fair value of investment (1)   0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_LoneStarMember
[2] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_LoneStarMember
[2] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_LoneStarMember
       
Ownership in affiliate   30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_LoneStarMember
           
Ranch JV [Member]                
Contributions to unconsolidated affiliates   0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_RanchJvMember
2us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_RanchJvMember
36us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_RanchJvMember
       
Distributions of earnings received from unconsolidated affiliates   (8)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_RanchJvMember
(2)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_RanchJvMember
0rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_RanchJvMember
       
Share of earnings of unconsolidated affiliates’ net income (loss)   9us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_RanchJvMember
1us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_RanchJvMember
(1)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_RanchJvMember
       
Amortization of excess fair value of investment (1)   0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_RanchJvMember
[2] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_RanchJvMember
[2] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_RanchJvMember
       
Ownership in affiliate   33.33%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_RanchJvMember
           
Grey Ranch JV [Member]                
Ownership in affiliate   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_GreyRanchJVMember
           
Aqua - PVR [Member]                
Contributions to unconsolidated affiliates   0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_AquaPVRMember
           
Distributions of earnings received from unconsolidated affiliates   (1)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_AquaPVRMember
           
Share of earnings of unconsolidated affiliates’ net income (loss)   (4)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_AquaPVRMember
           
Amortization of excess fair value of investment (1)   0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_AquaPVRMember
[2]            
Ownership in affiliate           51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_AquaPVRMember
   
Mi Vida JV [Member]                
Contributions to unconsolidated affiliates   54us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember
           
Distributions of earnings received from unconsolidated affiliates   0rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember
           
Share of earnings of unconsolidated affiliates’ net income (loss)   0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember
           
Amortization of excess fair value of investment (1)   0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember
[2]            
Ownership in affiliate           50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember
   
Other Unconsolidated Affiliates [Member]                
Contributions to unconsolidated affiliates   0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4] 0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4] 0us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4]        
Distributions of earnings received from unconsolidated affiliates   (4)rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4] 0rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4] 0rgp_DistributionsfromEquityMethodInvestment
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4]        
Share of earnings of unconsolidated affiliates’ net income (loss)   2us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4] 0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4] (9)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4]        
Amortization of excess fair value of investment (1)   0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[2],[4] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[2],[4] 0rgp_AmortizationOfExcessFairValueOfUnconsoldatedAffilaite
/ dei_LegalEntityAxis
= rgp_OtherUnconsolidatedAffiliatesMember
[4]        
Coal Handling [Member]                
Addtional ownership in affiliate acquired           50.00%rgp_EquityMethodInvestmentAdditionalOwnershipPercentageAcquired
/ dei_LegalEntityAxis
= rgp_CoalHandlingMember
   
Ownership in affiliate           50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_CoalHandlingMember
   
Non-recurring Distribution [Member]                
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital 185us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_StatementScenarioAxis
= rgp_NonrecurringDistributionMember
             
Maximum [Member] | HPC [Member]                
Property, Plant and Equipment, Useful Life   30 years 0 months 0 days            
Minimum [Member] | HPC [Member]                
Property, Plant and Equipment, Useful Life   15 years 0 months 0 days            
[1] (3) HPC entered into a $500 million 5-year revolving credit facility in September 2013, pursuant to which the Partnership pledged its 49.99% equity interest in HPC. Upon closing such credit facility, HPC borrowed $370 million to fund a non-recurring return of investment to its partners of which the Partnership received $185 million. The amount outstanding under this facility was $450 million as of December 31, 2014. The Partnership’s contingent obligation with respect to the outstanding borrowings under this facility was $225 million at December 31, 2014.
[2] The Partnership’s investment in HPC was adjusted to its fair value on May 26, 2010 and the excess fair value over net book value was comprised of two components: (1) $155 million was attributed to HPC’s long-lived assets and is being amortized as a reduction of income from unconsolidated affiliates over the useful lives of the respective assets, which vary from 15 to 30 years, and (2) $32 million could not be attributed to a specific asset and therefore will not be amortized in future periods.
[3] (2)The Partnership contributed $175 million to MEP in September 2014 for the repayment of MEP’s debt.
[4] (4)Includes Coal Handling, Grey Ranch, and Sweeny JV.