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Property and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property and Equipment      
Interest expense, Capitalized interest $ 48us-gaap_InterestCostsCapitalized $ 38us-gaap_InterestCostsCapitalized $ 36us-gaap_InterestCostsCapitalized
Property and equipment, gross 14,178us-gaap_PropertyPlantAndEquipmentGross 12,473us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation (1,906)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,654)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property and equipment, net 12,272us-gaap_PropertyPlantAndEquipmentNet 10,819us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense 319us-gaap_Depreciation 259us-gaap_Depreciation 222us-gaap_Depreciation
Impairments of long-lived assets 10us-gaap_OtherAssetImpairmentCharges 20us-gaap_OtherAssetImpairmentCharges 168us-gaap_OtherAssetImpairmentCharges
Pipelines and related facilities      
Property and Equipment      
Property and equipment, gross 7,003us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PipelinesMember
6,113us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PipelinesMember
 
Pipelines and related facilities | Minimum      
Property and Equipment      
Estimated Useful Lives 10 years    
Pipelines and related facilities | Maximum      
Property and Equipment      
Estimated Useful Lives 70 years    
Storage, terminal and rail facilities      
Property and Equipment      
Property and equipment, gross 4,853us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= paa_StorageTerminalAndRailFacilitiesMember
4,704us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= paa_StorageTerminalAndRailFacilitiesMember
 
Storage, terminal and rail facilities | Minimum      
Property and Equipment      
Estimated Useful Lives 30 years    
Storage, terminal and rail facilities | Maximum      
Property and Equipment      
Estimated Useful Lives 70 years    
Trucking equipment and other      
Property and Equipment      
Property and equipment, gross 198us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= paa_TruckingEquipmentAndOtherMember
150us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= paa_TruckingEquipmentAndOtherMember
 
Trucking equipment and other | Minimum      
Property and Equipment      
Estimated Useful Lives 3 years    
Trucking equipment and other | Maximum      
Property and Equipment      
Estimated Useful Lives 15 years    
Construction in progress      
Property and Equipment      
Property and equipment, gross 1,545us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
1,008us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
 
Office property and equipment      
Property and Equipment      
Property and equipment, gross 156us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
125us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
 
Office property and equipment | Minimum      
Property and Equipment      
Estimated Useful Lives 2 years    
Office property and equipment | Maximum      
Property and Equipment      
Estimated Useful Lives 50 years    
Land and other      
Property and Equipment      
Property and equipment, gross $ 423us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= paa_LandAndOtherMember
$ 373us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= paa_LandAndOtherMember