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Business Combinations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Aug. 31, 2014
bbl
Business Acquisition [Line Items]      
Number of refineries 1psx_RefineriesOwnedByEntity    
Net PP&E provisionally recorded   $ 471us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment  
Goodwill provisionally recorded   232psx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedGoodwill  
Intangible assets provisionally recorded   196us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill  
Net working capital provisionally recorded   70psx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetWorkingCapital  
Assumed long-term liabilities provisionally recorded   109us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities  
CapitalExpendituresAndInvestments [Member]      
Business Acquisition [Line Items]      
Consideration paid, net of cash acquired   $ 741us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ psx_CashFlowStatementLocationAxisAxis
= psx_CapitalExpendituresAndInvestmentsMember
 
Beaumont, Texas,Crude Oil And Petroleum Products Terminal, 7.1 Million-Barrel-Storage-Capacity [Member] | Midstream Segment [Member]      
Business Acquisition [Line Items]      
Storage capacity, barrels     7,100,000psx_StorageAssetsCapacity
/ us-gaap_BusinessAcquisitionAxis
= psx_BeaumontTexasCrudeOilAndPetroleumProductsTerminal7.1MillionBarrelStorageCapacityMember
/ us-gaap_StatementBusinessSegmentsAxis
= psx_MidstreamSegmentMember