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Consolidating Guarantor Financial Information Condensed Balance Sheet (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash $ 59us-gaap_CashAndCashEquivalentsAtCarryingValue $ 24us-gaap_CashAndCashEquivalentsAtCarryingValue $ 13us-gaap_CashAndCashEquivalentsAtCarryingValue $ 19us-gaap_CashAndCashEquivalentsAtCarryingValue
All other current assets 604rgp_AllothercurrentassetsGuarantorFinancials 679rgp_AllothercurrentassetsGuarantorFinancials    
Property, plant, and equipment, net 9,540us-gaap_PropertyPlantAndEquipmentNet 9,217us-gaap_PropertyPlantAndEquipmentNet    
Investments in subsidiaries 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures    
Investments in unconsolidated affiliates 2,484rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue 2,418rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue    
All other assets 4,729rgp_AllotherassetsGuarantorFinancials 4,765rgp_AllotherassetsGuarantorFinancials    
TOTAL ASSETS 17,416us-gaap_Assets 17,103us-gaap_Assets    
All other current liabilities 643us-gaap_LiabilitiesCurrent 756us-gaap_LiabilitiesCurrent    
Long-term liabilities 7,342rgp_Longtermliabilities 6,762rgp_Longtermliabilities    
Noncontrolling interest 155us-gaap_MinorityInterest 120us-gaap_MinorityInterest    
Total partners’ capital 9,276us-gaap_PartnersCapital 9,465us-gaap_PartnersCapital    
TOTAL LIABILITIES AND PARTNERS’ CAPITAL AND NONCONTROLLING INTEREST 17,416us-gaap_LiabilitiesAndStockholdersEquity 17,103us-gaap_LiabilitiesAndStockholdersEquity    
Parent Company [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
All other current assets 0rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
Property, plant, and equipment, net 0us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
Investments in subsidiaries 19,633us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
19,829us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
Investments in unconsolidated affiliates 0rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
All other assets 0rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
TOTAL ASSETS 19,633us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
19,829us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
All other current liabilities 0us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
Long-term liabilities 5,181rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
5,185rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
Noncontrolling interest 0us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
0us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
Total partners’ capital 14,452us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
14,644us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
TOTAL LIABILITIES AND PARTNERS’ CAPITAL AND NONCONTROLLING INTEREST 19,633us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
19,829us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ParentCompanyMember
   
Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
All other current assets 596rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
667rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property, plant, and equipment, net 9,186us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
8,948us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investments in subsidiaries 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investments in unconsolidated affiliates 2,283rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
2,252rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
All other assets 4,729rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
4,765rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
TOTAL ASSETS 16,794us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
16,632us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
All other current liabilities 627us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
723us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-term liabilities 2,160rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
1,575rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
Noncontrolling interest 0us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total partners’ capital 14,007us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
14,334us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
TOTAL LIABILITIES AND PARTNERS’ CAPITAL AND NONCONTROLLING INTEREST 16,794us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
16,632us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_GuarantorSubsidiariesMember
   
Non-Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash 66us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
32us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
13us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
19us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
All other current assets 9rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
13rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Property, plant, and equipment, net 437us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
353us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Investments in subsidiaries 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Investments in unconsolidated affiliates 0rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
0rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
All other assets 0rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
0rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
TOTAL ASSETS 512us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
398us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
All other current liabilities 21us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
34us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long-term liabilities 1rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
6rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Noncontrolling interest 0us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total partners’ capital 490us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
358us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
TOTAL LIABILITIES AND PARTNERS’ CAPITAL AND NONCONTROLLING INTEREST 512us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
398us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Consolidation, Eliminations [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash (7)us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(8)us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
All other current assets (1)rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(1)rgp_AllothercurrentassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
Property, plant, and equipment, net (83)us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(84)us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
Investments in subsidiaries (19,633)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(19,829)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
Investments in unconsolidated affiliates 201rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
166rgp_InvestmentinUnconsolidatedAffiliatesCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
All other assets 0rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
0rgp_AllotherassetsGuarantorFinancials
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
TOTAL ASSETS (19,523)us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(19,756)us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
All other current liabilities (5)us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(1)us-gaap_LiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
Long-term liabilities 0rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(4)rgp_Longtermliabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
Noncontrolling interest 155us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
120us-gaap_MinorityInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
Total partners’ capital (19,673)us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
(19,871)us-gaap_PartnersCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
   
TOTAL LIABILITIES AND PARTNERS’ CAPITAL AND NONCONTROLLING INTEREST $ (19,523)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember
$ (19,756)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ConsolidationEliminationsMember