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Debt, TLLP Debt (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended
Nov. 22, 2013
Jan. 14, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 29, 2014
Aug. 01, 2013
Sep. 14, 2012
Oct. 24, 2014
Aug. 22, 2014
Dec. 17, 2013
Debt Instrument                      
Debt instrument, face amount           $ 1,300us-gaap_DebtInstrumentFaceAmount          
Common units issued in offering (units) 6,300,000us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering 9,775,000us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering                  
Price per unit (dollars per unit) $ 51.05us-gaap_EquityIssuancePerShareAmount $ 41.70us-gaap_EquityIssuancePerShareAmount                  
Debt redemption charges     41us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 5us-gaap_GainsLossesOnExtinguishmentOfDebt            
TLLP 5.500% Senior Notes due 2019                      
Debt Instrument                      
Debt instrument interest rate     5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.5SeniorNotesdue2019Member
               
Debt Instrument, Maturity Date           Oct. 15, 2019          
Debt Instrument, Offering Date           Oct. 29, 2014          
Debt instrument, face amount           500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A5.5SeniorNotesdue2019Member
         
Senior notes     500us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A5.5SeniorNotesdue2019Member
0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A5.5SeniorNotesdue2019Member
             
Debt redemption charges     31us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= tso_A5.5SeniorNotesdue2019Member
               
TLLP 5.875% Senior Notes due 2020                      
Debt Instrument                      
Debt instrument interest rate     5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
               
Debt Instrument, Maturity Date     Oct. 01, 2020                
Debt instrument, face amount               350us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
  130us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
250us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
Debt Instrument, issuance premium percentage     102.25%tso_DebtInstrumentIssuancePremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
               
Senior notes     475us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
606us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
             
Debt instrument, unamortized premium     5us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
6us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
             
Redemption percentage     105.875%tso_RedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
               
Debt redemption charges     10us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
               
Debt instrument, collateral     The TLLP 2020 Notes are unsecured and guaranteed by all of TLLP’s subsidiaries, except Tesoro Logistics Finance Corp., the co-issuer, and a certain non-wholly owned subsidiary acquired in the Rockies Natural Gas Business Acquisition and are non-recourse to Tesoro, except for TLGP.                
TLLP 6.125% Senior Notes due 2021                      
Debt Instrument                      
Debt instrument interest rate     6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
               
Debt Instrument, Maturity Date             Oct. 15, 2021        
Debt instrument, face amount             550us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
       
Senior notes     550us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
550us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
             
Redemption percentage     106.125%tso_RedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
               
Percentage redemption with equity proceeds     35.00%tso_DebtInstrumentRedemptionWithEquityProceeds
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
               
Debt instrument, collateral     The TLLP 2021 Notes are unsecured and guaranteed by all of TLLP’s domestic subsidiaries, except Tesoro Logistics Finance Corp., the co-issuer, and a certain non-wholly owned subsidiary acquired in the Rockies Natural Gas Business Acquisition and are non-recourse to Tesoro, except for TLGP.                
TLLP 6.250% Senior Notes Due 2022                      
Debt Instrument                      
Debt instrument interest rate     6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
    6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
         
Debt Instrument, Maturity Date           Oct. 15, 2022          
Debt instrument, face amount           800us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
         
Senior notes     $ 800us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
$ 0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
             
Redemption percentage               106.25%tso_RedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
     
Percentage redemption with equity proceeds               35.00%tso_DebtInstrumentRedemptionWithEquityProceeds
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
     
Redemption Period One | TLLP 5.875% Senior Notes due 2020                      
Debt Instrument                      
Redemption premium percentage     2.938%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
               
Percentage redemption with equity proceeds     35.00%tso_DebtInstrumentRedemptionWithEquityProceeds
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
               
Redemption Period One | TLLP 6.125% Senior Notes due 2021                      
Debt Instrument                      
Redemption premium percentage     4.594%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
               
Redemption Period One | TLLP 6.250% Senior Notes Due 2022                      
Debt Instrument                      
Redemption premium percentage           3.125%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
         
Redemption Period Two | TLLP 5.875% Senior Notes due 2020                      
Debt Instrument                      
Redemption premium percentage     1.469%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.875SeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
               
Redemption Period Two | TLLP 6.125% Senior Notes due 2021                      
Debt Instrument                      
Redemption premium percentage     3.063%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
               
Redemption Period Two | TLLP 6.250% Senior Notes Due 2022                      
Debt Instrument                      
Redemption premium percentage           1.563%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.25SeniorNotesDue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
         
Redemption Period Three | TLLP 6.125% Senior Notes due 2021                      
Debt Instrument                      
Redemption premium percentage     1.531%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A6.125SeniorNotesDue2021Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
               
Limited Partner                      
Debt Instrument                      
Common units issued in offering (units)                 23,000,000us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
2,100,000us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
 
Price per unit (dollars per unit)                   $ 67.47us-gaap_EquityIssuancePerShareAmount
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember