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Long-Term Debt Narrative (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Feb. 28, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2013
Apr. 24, 2014
Mar. 25, 2014
Jul. 31, 2014
Feb. 26, 2015
Nov. 25, 2014
May 31, 2012
May 31, 2009
Mar. 31, 2014
Jul. 01, 2014
Mar. 21, 2014
Line of Credit Facility, Increase, Additional Borrowings     $ 3,860,000,000us-gaap_ProceedsFromLinesOfCredit $ 1,830,000,000us-gaap_ProceedsFromLinesOfCredit $ 1,560,000,000us-gaap_ProceedsFromLinesOfCredit                      
Line of Credit Facility, Decrease, Repayments     3,480,000,000us-gaap_RepaymentsOfLinesOfCredit 1,520,000,000us-gaap_RepaymentsOfLinesOfCredit 1,700,000,000us-gaap_RepaymentsOfLinesOfCredit                      
Line of Credit Facility, Maximum Borrowing Capacity 1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity 2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity 2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity 1,200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity             2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity          
Line of Credit Facility, Additional Borrowing Capacity 500,000,000rgp_LineOfCreditFacilityAdditionalBorrowingCapacity                              
Interest Costs Capitalized   5,000,000us-gaap_InterestCostsCapitalized 6,000,000us-gaap_InterestCostsCapitalized                          
Line Of Credit Facility Fronting Fee Percentage     0.20%rgp_LineOfCreditFacilityFrontingFeePercentage                          
Debt Covenant Maximum Debt To Ebitda Ratio     5.50rgp_DebtCovenantMaximumDebtToEbitdaRatio                          
Consolidated Interest Expense Ratio     2.50rgp_ConsolidatedInterestExpenseRatio                          
Secured Debt to Consolidated EBITDA Ratio     3.25rgp_SecuredDebtToConsolidatedEbitdaRatio                          
Debt Instrument, Face Amount   5,089,000,000us-gaap_DebtInstrumentFaceAmount 5,089,000,000us-gaap_DebtInstrumentFaceAmount 2,800,000,000us-gaap_DebtInstrumentFaceAmount                        
Repayments of Long-term Debt     983,000,000us-gaap_RepaymentsOfLongTermDebt 163,000,000us-gaap_RepaymentsOfLongTermDebt 88,000,000us-gaap_RepaymentsOfLongTermDebt                      
Long-term Debt   6,593,000,000us-gaap_LongTermDebt [1] 6,593,000,000us-gaap_LongTermDebt [1]                          
Long-term Debt, Maturities, Repayments of Principal in Year Four   0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour                          
Letter of Credit, Increase in Letter of Credit Sublimit, Before 50,000,000rgp_LetterofCreditIncreaseinLetterofCreditSublimitBefore                              
Letter of Credit, Increase in Letter of Credit Sublimit, After 100,000,000rgp_LetterofCreditIncreaseinLetterofCreditSublimitAfter                              
Letter of Credit Issuance Threshold 25,000,000rgp_LetterofCreditIssuanceThreshold                              
Letter of Credit, Increase in Permitted Investments, Before 300,000,000rgp_LetterofCreditIncreaseinPermittedInvestmentsBefore                              
Letter of Credit, Increase in Permitted Investments, After 500,000,000rgp_LetterofCreditIncreaseinPermittedInvestmentsAfter                              
Revolving Credit Facility [Member]                                
Write off of Deferred Debt Issuance Cost     0us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		                          
Line of Credit Facility, Maximum Borrowing Capacity           1,200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		                    
Line of Credit Facility, Additional Borrowing Capacity           300,000,000rgp_LineOfCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		                    
Line of Credit Facility, Covenant Terms           50                    
Revolving Credit Facility Weighted Average Rate     2.17%rgp_RevolvingCreditFacilityWeightedAverageRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		                          
Senior Notes Due Two Thousand Sixteen [Member]                                
Debt Instrument, Face Amount                         250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		      
Debt Instrument, Interest Rate, Stated Percentage                         9.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		      
Senior Note Redeemable Portion       35.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		 35.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		                      
Repayments of Long-term Debt       88,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		 88,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		                      
Long-term Debt                       163,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		        
Redemption Premium         8,000,000us-gaap_RedemptionPremium
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		                      
Writeoff of unamortized loan fee         1,000,000rgp_WriteoffOfUnamortizedLoanFee
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		                      
Writeoff of unamortized bond premium         2,000,000rgp_WriteoffOfUnamortizedBondPremium
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		                      
Extinguishment of Debt, Amount       178,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		                        
Debt Instrument, Increase, Accrued Interest       7,000,000us-gaap_DebtInstrumentIncreaseAccruedInterest
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		 4,000,000us-gaap_DebtInstrumentIncreaseAccruedInterest
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandSixteenMember		                      
Senior Notes Due Two Thousand Eighteen [Member]                                
Debt Instrument, Face Amount   600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandEighteenMember		 600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandEighteenMember		                          
Debt Instrument, Redemption Price, Percentage     103.438%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandEighteenMember		                          
Repayments of Long-term Debt   621,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandEighteenMember		                            
Senior Notes Due Two Thousand And Twenty One [Member]                                
Debt Instrument, Face Amount   500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember		 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember		                          
Debt Instrument, Interest Rate, Stated Percentage   6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember		 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember		                          
Senior Notes Due Two Thousand And Twenty Two [Member]                                
Debt Instrument, Face Amount   900,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyTwoMember		 900,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyTwoMember		                          
Debt Instrument, Interest Rate, Stated Percentage   5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyTwoMember		 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyTwoMember		                          
4.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Debt Instrument, Face Amount   600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A45SeniorNotesDueTwoThousandTwentyThreeMember		 600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A45SeniorNotesDueTwoThousandTwentyThreeMember		                          
Debt Instrument, Interest Rate, Stated Percentage   4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A45SeniorNotesDueTwoThousandTwentyThreeMember		 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A45SeniorNotesDueTwoThousandTwentyThreeMember		                          
5.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Debt Instrument, Face Amount   700,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember		 700,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember		                          
Debt Instrument, Interest Rate, Stated Percentage   5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember		 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember		                          
5.75% Senior Notes Due Two Thousand and Twenty [Member]                                
Debt Instrument, Face Amount   400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A5.75SeniorNotesDueTwoThousandandTwentyMember		 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A5.75SeniorNotesDueTwoThousandandTwentyMember		                          
Debt Instrument, Interest Rate, Stated Percentage   5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.75SeniorNotesDueTwoThousandandTwentyMember		 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.75SeniorNotesDueTwoThousandandTwentyMember		                          
8.25% PVR Senior Notes Due Two Thousand Eighteen [Member]                                
Debt Instrument, Face Amount                           300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.25PVRSeniorNotesDueTwoThousandEighteenMember		    
Debt Instrument, Interest Rate, Stated Percentage                           8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.25PVRSeniorNotesDueTwoThousandEighteenMember		    
Debt Instrument, Redemption Price, Percentage             104.125%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.25PVRSeniorNotesDueTwoThousandEighteenMember		                  
Extinguishment of Debt, Amount             313,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.25PVRSeniorNotesDueTwoThousandEighteenMember		                  
6.5% PVR Senior Notes Due Two Thousand Twenty One [Member]                                
Debt Instrument, Face Amount   400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember		 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember		                          
Debt Instrument, Interest Rate, Stated Percentage   6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember		 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember		                          
8.375% PVR Senior Notes Due Two Thousand Twenty [Member]                                
Debt Instrument, Face Amount   473,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		 473,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		                          
Debt Instrument, Interest Rate, Stated Percentage   8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		 8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		                          
Debt Instrument, Redemption Price, Percentage               101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		                
Repayments of Long-term Debt, Principal Portion                 83,000,000rgp_RepaymentsofLongtermDebtPrincipalPortion
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		              
Repayments of Long-term Debt                 91,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		              
Debt Instrument, Increase, Accrued Interest                 8,000,000us-gaap_DebtInstrumentIncreaseAccruedInterest
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember		              
5.00% Senior Notes Due Two Thousand Twenty Two [Member]                                
Debt Instrument, Face Amount   700,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A5.00SeniorNotesDueTwoThousandTwentyTwoMember		 700,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A5.00SeniorNotesDueTwoThousandTwentyTwoMember		                          
Debt Instrument, Interest Rate, Stated Percentage   5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.00SeniorNotesDueTwoThousandTwentyTwoMember		 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.00SeniorNotesDueTwoThousandTwentyTwoMember		                          
Federal Funds Effective Rate [Member]                                
Debt Instrument, Basis Spread on Variable Rate     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ rgp_InterestRateTypeAxis
= rgp_FederalFundsEffectiveRateMember		                          
LIBOR [Member]                                
Debt Instrument, Basis Spread on Variable Rate     1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ rgp_InterestRateTypeAxis
= rgp_LiborMember		                          
Minimum [Member]                                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                          
Minimum [Member] | Base Rate Loans [Member]                                
Debt Instrument, Basis Spread on Variable Rate     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ rgp_InterestRateTypeAxis
= rgp_BaseRateLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                          
Minimum [Member] | Eurodollar [Member]                                
Debt Instrument, Basis Spread on Variable Rate     1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ rgp_InterestRateTypeAxis
= us-gaap_EurodollarMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                          
Maximum [Member]                                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                          
Maximum [Member] | Base Rate Loans [Member]                                
Debt Instrument, Basis Spread on Variable Rate     1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ rgp_InterestRateTypeAxis
= rgp_BaseRateLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                          
Maximum [Member] | Eurodollar [Member]                                
Debt Instrument, Basis Spread on Variable Rate     2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ rgp_InterestRateTypeAxis
= us-gaap_EurodollarMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                          
Redemption Before December 1, 2021 [Member] | Senior Notes Due Two Thousand And Twenty Two [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyTwoMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeDecember12021Member		                          
Redemption After December 1, 2021 [Member] | Senior Notes Due Two Thousand And Twenty Two [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyTwoMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterDecember12021Member		                          
Net of redemption [Member] | 8.375% PVR Senior Notes Due Two Thousand Twenty [Member]                                
Debt Instrument, Face Amount   390,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_NetofredemptionMember		 390,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_NetofredemptionMember		                          
Redemption Before June 1, 2020 [Member] | 5.75% Senior Notes Due Two Thousand and Twenty [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A5.75SeniorNotesDueTwoThousandandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJune12020Member		                          
Redemption After June 1, 2020 [Member] | 5.75% Senior Notes Due Two Thousand and Twenty [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A5.75SeniorNotesDueTwoThousandandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12020Member		                          
Redemption Before July 15. 2014 [Member] | Senior Notes Due Two Thousand And Twenty One [Member]                                
Senior Note Redeemable Portion     35.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJuly15.2014Member		                          
Debt Instrument, Redemption Price, Percentage     106.50%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJuly15.2014Member		                          
Redemption After July 15 2016 [Member] | Senior Notes Due Two Thousand And Twenty One [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJuly152016Member		                          
Debt Instrument, Redemption Price, Percentage     103.25%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJuly152016Member		                          
Redemption After July 15 2017 [Member] | Senior Notes Due Two Thousand And Twenty One [Member]                                
Debt Instrument, Redemption Price, Percentage     102.167%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJuly152017Member		                          
Redemption After July 15 2018 [Member] | Senior Notes Due Two Thousand And Twenty One [Member]                                
Debt Instrument, Redemption Price, Percentage     101.083%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJuly152018Member		                          
Redemption July 15 2019 And Thereafter [Member] | Senior Notes Due Two Thousand And Twenty One [Member]                                
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_SeniorNotesDueTwoThousandAndTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionJuly152019AndThereafterMember		                          
Eagle Rock [Member] | 8.375% Senior Notes Due Two Thousand Nineteen [Member]                                
Debt Instrument, Face Amount   499,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_EagleRockMember		 499,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_EagleRockMember		                          
Debt Instrument, Interest Rate, Stated Percentage   8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_EagleRockMember		 8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_EagleRockMember		                       8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_EagleRockMember		  
Redemption prior to July 1, 2022 [Member] | 5.00% Senior Notes Due Two Thousand Twenty Two [Member]                                
Senior Note Redeemable Portion                 100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A5.00SeniorNotesDueTwoThousandTwentyTwoMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJuly12022Member		              
Senior Note Redemption Percentage     100.00%rgp_SeniorNoteRedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.00SeniorNotesDueTwoThousandTwentyTwoMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJuly12022Member		                          
Redemption Before August 1, 2023 [Member] | 4.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Senior Note Redemption Percentage     100.00%rgp_SeniorNoteRedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A45SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeAugust12023Member		                          
Redemption After August 1, 2023 [Member] | 4.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Senior Note Redemption Percentage     100.00%rgp_SeniorNoteRedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A45SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterAugust12023Member		                          
Redemption Before October 15, 2017 [Member] | 5.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Senior Note Redeemable Portion     35.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeOctober152015Member		                          
Debt Instrument, Redemption Price, Percentage     105.50%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeOctober152015Member		                          
Redemption After October 15, 2017 [Member] | 5.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterOctober152017Member		                          
Debt Instrument, Redemption Price, Percentage     102.75%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterOctober152017Member		                          
Redemption After October 15, 2018 [Member] | 5.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Debt Instrument, Redemption Price, Percentage     101.833%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterOctober152018Member		                          
Redemption After October 15, 2019 [Member] | 5.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Debt Instrument, Redemption Price, Percentage     100.917%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterOctober152019Member		                          
Redemption October 15, 2020 and Thereafter [Member] | 5.5% Senior Notes Due Two Thousand Twenty Three [Member]                                
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.5SeniorNotesDueTwoThousandTwentyThreeMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionOctober152020andThereafterMember		                          
Redemption Before June 1, 2016 [Member] | 8.375% PVR Senior Notes Due Two Thousand Twenty [Member]                                
Senior Note Redeemable Portion     35.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJune12015Member		                          
Debt Instrument, Redemption Price, Percentage     108.375%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJune12015Member		                          
Redemption Before June 1, 2016 [Member] | 8.375% Senior Notes Due Two Thousand Nineteen [Member]                                
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeJune12015Member		                          
Redemption After June 1, 2017 and Thereafter [Member] | 8.375% Senior Notes Due Two Thousand Nineteen [Member]                                
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12017andThereafterMember		                          
Redemption After June 1, 2015 [Member] | 8.375% Senior Notes Due Two Thousand Nineteen [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12015Member		                          
Debt Instrument, Redemption Price, Percentage     104.188%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12015Member		                          
Redemption After June 1, 2016 [Member] | 8.375% PVR Senior Notes Due Two Thousand Twenty [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12016Member		                          
Debt Instrument, Redemption Price, Percentage     104.188%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12016Member		                          
Redemption After June 1, 2016 [Member] | 8.375% Senior Notes Due Two Thousand Nineteen [Member]                                
Debt Instrument, Redemption Price, Percentage     102.094%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375SeniorNotesDueTwoThousandNineteenMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12016Member		                          
Redemption After June 1, 2017 [Member] | 8.375% PVR Senior Notes Due Two Thousand Twenty [Member]                                
Debt Instrument, Redemption Price, Percentage     102.094%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12017Member		                          
Redemption After June 1, 2018 [Member] | 8.375% PVR Senior Notes Due Two Thousand Twenty [Member]                                
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A8.375PVRSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterJune12018andThereafterMember		                          
Redemption Before May 15, 2016 [Member] | 6.5% PVR Senior Notes Due Two Thousand Twenty One [Member]                                
Senior Note Redeemable Portion     35.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeMay152016Member		                          
Debt Instrument, Redemption Price, Percentage     106.50%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionBeforeMay152016Member		                          
Redemption After May 15, 2019 [Member] | 6.5% PVR Senior Notes Due Two Thousand Twenty One [Member]                                
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterMay152019andThereafterMember		                          
Redemption After May 15, 2018 [Member] | 6.5% PVR Senior Notes Due Two Thousand Twenty One [Member]                                
Debt Instrument, Redemption Price, Percentage     101.625%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterMay152018Member		                          
Redemption After May 15, 2017 [Member] | 6.5% PVR Senior Notes Due Two Thousand Twenty One [Member]                                
Debt Instrument, Redemption Price, Percentage     103.25%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterMay152017Member		                          
Redemption After May 15, 2016 [Member] | 6.5% PVR Senior Notes Due Two Thousand Twenty One [Member]                                
Senior Note Redeemable Portion     100.00%rgp_SeniorNoteRedeemablePortion
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterMay152016Member		                          
Debt Instrument, Redemption Price, Percentage     104.875%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A6.5PVRSeniorNotesDueTwoThousandTwentyOneMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionAfterMay152016Member		                          
Redemption after July 1, 2022 [Member] | 5.00% Senior Notes Due Two Thousand Twenty Two [Member]                                
Senior Note Redemption Percentage     100.00%rgp_SeniorNoteRedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= rgp_A5.00SeniorNotesDueTwoThousandTwentyTwoMember
/ us-gaap_StatementScenarioAxis
= rgp_RedemptionafterJuly12022Member		                          
PVR [Member]                                
Long-term debt                               1,788,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ dei_LegalEntityAxis
= rgp_PVRMember
PVR [Member] | Net of redemption [Member]                                
Long-term debt                               1,200,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ dei_LegalEntityAxis
= rgp_PVRMember
/ us-gaap_StatementScenarioAxis
= rgp_NetofredemptionMember
Revolving Credit Facility [Member]                                
Line of Credit Facility, Maximum Borrowing Capacity                   $ 2,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_RevolvingCreditFacilityMember		            
Line of Credit Facility, Increase (Decrease) for Period, Description                   500            
[1] *Excludes a $67 million unamortized premium on the 2020 PVR Notes and the 2021 PVR Notes assumed by the Partnership and a $19 million unamortized discount on the combined 2022 Notes.