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Investment In Unconsolidated Affiliates Table - Carrying Value of Investment In Unconsolidated Affiliates (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Schedule of Investments      
Ownership in affiliate 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Investment in Unconsolidated Affiliates, Carrying Value $ 2,418us-gaap_EquityMethodInvestments   $ 2,097us-gaap_EquityMethodInvestments
HPC [Member]      
Schedule of Investments      
Ownership in affiliate 49.99%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_HpcMember		    
Investment in Unconsolidated Affiliates, Carrying Value 422us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_HpcMember		   442us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_HpcMember
MEP [Member]      
Schedule of Investments      
Ownership in affiliate 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_MepMember		    
Investment in Unconsolidated Affiliates, Carrying Value 695us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MepMember		   549us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MepMember
Lone Star [Member]      
Schedule of Investments      
Ownership in affiliate 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_LoneStarMember		    
Investment in Unconsolidated Affiliates, Carrying Value 1,162us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_LoneStarMember		   1,070us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_LoneStarMember
Ranch JV [Member]      
Schedule of Investments      
Ownership in affiliate 33.33%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_RanchJvMember		    
Investment in Unconsolidated Affiliates, Carrying Value 38us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_RanchJvMember		   36us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_RanchJvMember
Aqua - PVR [Member]      
Schedule of Investments      
Ownership in affiliate   51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_AquaPVRMember		  
Investment in Unconsolidated Affiliates, Carrying Value 46us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_AquaPVRMember		   0us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_AquaPVRMember
Coal Handling [Member]      
Schedule of Investments      
Ownership in affiliate   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_CoalHandlingMember		  
Sweeny JV [Member]      
Schedule of Investments      
Ownership in affiliate 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_SweenyJVMember		    
Mi Vida JV [Member]      
Schedule of Investments      
Ownership in affiliate   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember		  
Investment in Unconsolidated Affiliates, Carrying Value 54us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember		   0us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= rgp_MiVidaJVMember
Grey Ranch JV [Member]      
Schedule of Investments      
Investment in Unconsolidated Affiliates, Carrying Value $ 1us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_OtherAffiliatesMember		   $ 0us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_OtherAffiliatesMember