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Segment Disclosures and Related Information (Narrative) (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Segment Disclosures and Related Information (Textual) [Abstract]    
Number of refineries 1psx_RefineriesOwnedByEntity  
DCP Midstream [Member]    
Segment Disclosures and Related Information (Textual) [Abstract]    
Equity investment   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= psx_DcpMidstreamMember
CP Chem [Member]    
Segment Disclosures and Related Information (Textual) [Abstract]    
Equity investment   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= psx_CpChemMember
United States [Member]    
Segment Disclosures and Related Information (Textual) [Abstract]    
Number of refineries   14psx_RefineriesOwnedByEntity
/ us-gaap_StatementGeographicalAxis
= psx_MainlyUnitedStatesAndEuropeMember
Refining [Member] | Excel and Jupiter Sulphur, LLC [Member]    
Segment Disclosures and Related Information (Textual) [Abstract]    
Number of equity investments moved   (2)psx_NumberofEquityInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= psx_ExcelandJupiterSulphurLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= psx_RefiningMember
Marketing And Specialties [Member] | Excel and Jupiter Sulphur, LLC [Member]    
Segment Disclosures and Related Information (Textual) [Abstract]    
Number of equity investments moved   2psx_NumberofEquityInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= psx_ExcelandJupiterSulphurLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= psx_MarketingAndSpecialtiesSegmentMember