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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment    
Property, plant and equipment, at cost $ 11,633us-gaap_PropertyPlantAndEquipmentGross $ 9,123us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (2,588)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (2,248)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net Property, Plant and Equipment 9,045us-gaap_PropertyPlantAndEquipmentNet 6,875us-gaap_PropertyPlantAndEquipmentNet
Refining    
Property, Plant and Equipment    
Property, plant and equipment, at cost 6,994us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= tso_RefiningSegmentMember		 6,546us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= tso_RefiningSegmentMember
TLLP    
Property, Plant and Equipment    
Property, plant and equipment, at cost 3,551us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= tso_TesoroLogisticsLPMember		 1,569us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= tso_TesoroLogisticsLPMember
Retail    
Property, Plant and Equipment    
Property, plant and equipment, at cost 834us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= tso_RetailSegmentMember		 778us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= tso_RetailSegmentMember
Corporate    
Property, Plant and Equipment    
Property, plant and equipment, at cost $ 254us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 230us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember