2.4.0.82407402 - Disclosure - Investment In Unconsolidated Affiliates (Narrative) (Details)truefalseIn Millions, unless otherwise specifiedfalse1false USDtruefalse$D2010Q2May26_dei_LegalEntityAxis_rgp_HpcMemberhttp://www.sec.gov/CIK0001338613duration2010-05-23T00:00:002010-05-25T00:00:00falsefalseHPCdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_HpcMemberdei_LegalEntityAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false truefalseI2012Q4_dei_LegalEntityAxis_rgp_HpcMemberhttp://www.sec.gov/CIK0001338613instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseHPCdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_HpcMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli03false truefalseI2010Q2April_dei_LegalEntityAxis_rgp_HpcMemberhttp://www.sec.gov/CIK0001338613instant2010-04-30T00:00:000001-01-01T00:00:00falsefalseHPCdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_HpcMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli04false USDtruefalse$D2011Q3Sep_dei_LegalEntityAxis_rgp_MepMemberhttp://www.sec.gov/CIK0001338613duration2011-08-31T00:00:002011-09-01T00:00:00falsefalseMEPdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_MepMemberdei_LegalEntityAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170numberStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$5false truefalseD2010Q2May10_dei_LegalEntityAxis_rgp_MepMemberhttp://www.sec.gov/CIK0001338613duration2010-05-01T00:00:002010-05-31T00:00:00falsefalseMEPdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_MepMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli06false truefalseI2012Q4_dei_LegalEntityAxis_rgp_MepMemberhttp://www.sec.gov/CIK0001338613instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseMEPdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_MepMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli07false truefalseI2011Q3Aug30_dei_LegalEntityAxis_rgp_MepMemberhttp://www.sec.gov/CIK0001338613instant2011-08-30T00:00:000001-01-01T00:00:00falsefalseMEPdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_MepMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli08false truefalseI2010Q2SD_dei_LegalEntityAxis_rgp_MepMemberhttp://www.sec.gov/CIK0001338613instant2010-05-25T00:00:000001-01-01T00:00:00falsefalseMEPdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_MepMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli09false truefalseI2012Q4_dei_LegalEntityAxis_rgp_LoneStarMemberhttp://www.sec.gov/CIK0001338613instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseLone Stardei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_LoneStarMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli010false truefalseI2012Q4_dei_LegalEntityAxis_rgp_RanchJvMemberhttp://www.sec.gov/CIK0001338613instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseRanch JVdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_RanchJvMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli011false truefalseI2013Q2Apr_dei_LegalEntityAxis_rgp_GreyRanchJVMemberhttp://www.sec.gov/CIK0001338613instant2013-04-30T00:00:000001-01-01T00:00:00falsefalseGrey Ranch JV [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_GreyRanchJVMemberdei_LegalEntityAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli012false truefalseD2010Q2May26_dei_LegalEntityAxis_rgp_HpcMember_us-gaap_RangeAxis_us-gaap_MinimumMemberhttp://www.sec.gov/CIK0001338613duration2010-05-23T00:00:002010-05-25T00:00:00falsefalseMinimumus-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MinimumMemberus-gaap_RangeAxisexplicitMemberfalsefalseHPCdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_HpcMemberdei_LegalEntityAxisexplicitMember13false truefalseD2010Q2May26_dei_LegalEntityAxis_rgp_HpcMember_us-gaap_RangeAxis_us-gaap_MaximumMemberhttp://www.sec.gov/CIK0001338613duration2010-05-23T00:00:002010-05-25T00:00:00falsefalseMaximumus-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MaximumMemberus-gaap_RangeAxisexplicitMemberfalsefalseHPCdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldirgp_HpcMemberdei_LegalEntityAxisexplicitMember1false 4us-gaap_EquityMethodInvestmentOwnershipPercentageus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2truetruefalse0.49990.4999falsefalsefalse3falsetruefalse00falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalse6truetruefalse0.500.50falsefalsefalse7falsetruefalse00falsefalsefalse8truetruefalse0.4990.499falsefalsefalse9truetruefalse0.300.30falsefalsefalse10truetruefalse0.33330.3333falsefalsefalse11truetruefalse0.500.50falsefalsefalse12falsetruefalse00falsefalsefalse13falsetruefalse00falsefalsefalsenum:percentItemTypepureThe percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Ownership in affiliate2false 4rgp_EquityMethodInvestmentExcessFairValueOverBookValueAdjustmentLongLivedAssetsrgp_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse155000000155USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryEquity Method Investment Excess Fair Value Over Book Value Adjustment Long Lived AssetsNo definition available.false2Equity method investment, excess fair value over book value adjustment, long-lived assets3false 4us-gaap_PropertyPlantAndEquipmentUsefulLifeus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse0015 years 0 months 0 daysfalsefalsefalse13falsefalsefalse0030 years 0 months 0 daysfalsefalsefalsexbrli:durationItemTypenaUseful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.No definition available.false0Long-lived assets, useful life, minimum4false 4rgp_EquityMethodInvestmentExcessFairValueOverBookValueAdjustmentNotAttributedToSpecificAssetsrgp_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse3200000032falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryEquity Method Investment Excess Fair Value Over Book Value Adjustment Not Attributed To Specific AssetsNo definition available.false2Equity method investment, excess fair value over book value adjustment, not attributed to specific assets5false 4rgp_EquityMethodInvestmentAdditionalOwnershipPercentageAcquiredrgp_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3truetruefalse0.06990.0699falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7truetruefalse0.0010.001falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalse13falsetruefalse00falsefalsefalsenum:percentItemTypepureEquity Method Investment, Additional Ownership Percentage AcquiredNo definition available.false0Addtional ownership in affiliate acquired6false 4rgp_PaymentsToAcquireAdditionalInterestInSubsidiariesAndAffiliatesrgp_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse10000001USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryPayments to Acquire Additional Interest in Subsidiaries and AffiliatesNo definition available.false2Purchase of additional general partner interest in unconsolidated affiliates7false 4us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterestus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalse4falsetruefalse00falsefalsefalse5truetruefalse0.4990.499falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalse13falsetruefalse00falsefalsefalsenum:percentItemTypepureThe number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 22 -Article 12 false0Partneship ownership interest percentagefalseInvestment In Unconsolidated Affiliates (Narrative) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.regencyenergy.com/role/InvestmentInUnconsolidatedAffiliatesNarrativeDetails137