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Related Party Transactions Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2012
General and Administrative Expense $ 158us-gaap_GeneralAndAdministrativeExpense $ 88us-gaap_GeneralAndAdministrativeExpense $ 100us-gaap_GeneralAndAdministrativeExpense    
Related Party Transaction, NGL Sales 282rgp_RelatedPartyTransactionNglSales 81rgp_RelatedPartyTransactionNglSales 28rgp_RelatedPartyTransactionNglSales    
ETE [Member]          
Related Party Transaction, Expenses from Transactions with Related Party 6us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= rgp_EteMember
11us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= rgp_EteMember
17us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= rgp_EteMember
   
Distribution Made to Limited Partner, Cash Distributions Paid 175us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid
/ dei_LegalEntityAxis
= rgp_EteMember
107us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid
/ dei_LegalEntityAxis
= rgp_EteMember
62us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid
/ dei_LegalEntityAxis
= rgp_EteMember
   
ETE [Member] | May Twenty Six Service Agreement [Member]          
Management Fee Waived       10rgp_WaivedManagementFee
/ rgp_BusinessAcquisitionPeriodInformationAxis
= rgp_MayTwentySixServiceAgreementMember
/ dei_LegalEntityAxis
= rgp_EteMember
 
ETP [Member]          
Payments to Acquire Machinery and Equipment 67us-gaap_PaymentsToAcquireMachineryAndEquipment
/ dei_LegalEntityAxis
= rgp_EtpMember
95us-gaap_PaymentsToAcquireMachineryAndEquipment
/ dei_LegalEntityAxis
= rgp_EtpMember
     
HPC [Member]          
General and Administrative Expense 14us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= rgp_HpcMember
18us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= rgp_HpcMember
20us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= rgp_HpcMember
   
Lone Star [Member]          
Related Party Transaction, NGL Sales 257rgp_RelatedPartyTransactionNglSales
/ dei_LegalEntityAxis
= rgp_LoneStarMember
       
Management Fee [Member]          
Related Party Transaction, Expenses from Transactions with Related Party         21us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_StatementScenarioAxis
= rgp_ManagementFeeMember
Royalty Fee [Member]          
Related Party Transaction, Expenses from Transactions with Related Party         1us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_StatementScenarioAxis
= rgp_RoyaltyFeeMember
ETE And Its Subsidiaries | Gathering And Processing          
Revenue from Related Parties 351us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rgp_EteAndItsSubsidiariesMember
/ us-gaap_StatementBusinessSegmentsAxis
= rgp_GatheringAndProcessingMember
       
Related Parties Amount in Cost of Sales 52us-gaap_RelatedPartiesAmountInCostOfSales
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rgp_EteAndItsSubsidiariesMember
/ us-gaap_StatementBusinessSegmentsAxis
= rgp_GatheringAndProcessingMember
       
ETE And Its Subsidiaries | Contract Services          
Revenue from Related Parties $ 1us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rgp_EteAndItsSubsidiariesMember
/ us-gaap_StatementBusinessSegmentsAxis
= rgp_ContractServicesMember