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Organization and Basis of Consolidaton and Presentation (Details)
 3 Months Ended
Mar. 31, 2015
segment
Organization and basis of presentation  
Operating segments number 3us-gaap_NumberOfOperatingSegments
GP LLC  
Organization and basis of presentation  
Consolidated subsidiary, ownership interest held by the parent (as a percent) 100.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ dei_LegalEntityAxis
= pagp_PlainsAllAmericanGPLLCMember
AAP  
Organization and basis of presentation  
Consolidated subsidiary, ownership interest held by the parent (as a percent) 37.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= pagp_PlainsAAPLPMember
Consolidated subsidiary, ownership interest held by the parent (in units) 222,773,809pagp_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterestUnits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= pagp_PlainsAAPLPMember
AAP | PAA | Indirect Ownership  
Organization and basis of presentation  
General partner or managing member ownership interest (as a percent) 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= pagp_PlainsAllAmericanPipelineLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= pagp_IndirectOwnershipInterestInEntityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= pagp_PlainsAAPLPMember
PAA GP | PAA  
Organization and basis of presentation  
General partner or managing member ownership interest (as a percent) 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= pagp_PlainsAllAmericanPipelineLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= pagp_PAAGPLLCMember