Summary of Significant Accounting Policies - Asset Table (details) (Western Gas Partners [Member])
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Dec. 31, 2014
unit
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Operated [Member] | Natural Gas Gathering Systems [Member]
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Assets [Line Items] |
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Assets, number of units |
14us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasGatheringSystemMember |
Operated [Member] | Natural Gas Treating Facilities [Member]
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Assets [Line Items] |
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Assets, number of units |
8us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasTreatingFacilitiesMember |
Operated [Member] | Natural Gas Processing Facilities [Member]
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Assets [Line Items] |
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Assets, number of units |
13us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_NaturalGasProcessingPlantMember |
Operated [Member] | Natural Gas Liquids Pipelines [Member]
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Assets [Line Items] |
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Assets, number of units |
3us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasLiquidsPipelineMember |
Operated [Member] | Natural Gas Pipelines [Member]
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Assets [Line Items] |
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Assets, number of units |
4us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = naics_ZZ486210 |
Operated [Member] | Oil Pipeline [Member]
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Assets [Line Items] |
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Assets, number of units |
1us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = naics_ZZ486110 |
Operated Interests [Member] | Natural Gas Gathering Systems [Member]
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Assets [Line Items] |
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Assets, number of units |
1us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedInterestMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasGatheringSystemMember |
Operated Interests [Member] | Natural Gas Processing Facilities [Member]
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Assets [Line Items] |
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Assets, number of units |
3us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_OperatedInterestMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_NaturalGasProcessingPlantMember |
Non-Operated Interests [Member] | Natural Gas Gathering Systems [Member]
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Assets [Line Items] |
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Assets, number of units |
5us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = wgp_NonOperatedInterestMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasGatheringSystemMember |
Equity Interests [Member] | Natural Gas Gathering Systems [Member]
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Assets [Line Items] |
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Assets, number of units |
2us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasGatheringSystemMember |
Equity Interests [Member] | Natural Gas Treating Facilities [Member]
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Assets [Line Items] |
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Assets, number of units |
1us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasTreatingFacilitiesMember |
Equity Interests [Member] | Natural Gas Processing Facilities [Member]
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Assets [Line Items] |
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Assets, number of units |
2us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_NaturalGasProcessingPlantMember |
Equity Interests [Member] | Natural Gas Liquids Pipelines [Member]
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Assets [Line Items] |
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Assets, number of units |
3us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wgp_NaturalGasLiquidsPipelineMember |
Equity Interests [Member] | Oil Pipeline [Member]
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Assets [Line Items] |
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Assets, number of units |
1us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / dei_LegalEntityAxis = wgp_WesternGasPartnersMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = naics_ZZ486110 |