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Segment Information Narrative (Details)
 12 Months Ended
Dec. 31, 2014
Ownership in affiliate 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
ORS [Member]  
Ownership in affiliate 75.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_ORSMember
ELG [Member]  
Ownership in affiliate 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_ELGMember
Ranch JV [Member]  
Ownership in affiliate 33.33%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_RanchJvMember
Lone Star [Member]  
Ownership in affiliate 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_LoneStarMember
HPC [Member]  
Ownership in affiliate 49.99%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_HpcMember
Length Of Gas Pipeline System 450rgp_LengthOfGasPipelineSystem
/ dei_LegalEntityAxis
= rgp_HpcMember
MEP [Member]  
Ownership in affiliate 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_MepMember
Length Of Gas Pipeline System 500rgp_LengthOfGasPipelineSystem
/ dei_LegalEntityAxis
= rgp_MepMember
Sweeny JV [Member]  
Ownership in affiliate 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_SweenyJVMember