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Debt, Tesoro Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 29, 2014
Credit Facility        
Repayments under Term Loan Facility $ 386,000,000us-gaap_RepaymentsOfLinesOfCredit $ 2,068,000,000us-gaap_RepaymentsOfLinesOfCredit $ 352,000,000us-gaap_RepaymentsOfLinesOfCredit  
Debt instrument, face amount       1,300,000,000us-gaap_DebtInstrumentFaceAmount
Debt redemption charges 41,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 5,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt  
Tesoro Corporation Revolving Credit Facility        
Credit Facility        
Total available capacity 3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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= us-gaap_RevolvingCreditFacilityMember
     
Maturity date Nov. 18, 2019 [1]      
30 day Eurodollar (LIBOR) Rate 0.17%tso_EurodollarRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[2]      
Eurodollar Margin 1.50%tso_DebtInstrumentBasisSpreadOnVariableRateTwo
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[2]      
Base Rate 3.25%tso_DebtInstrumentBaseRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[2]      
Base Rate Margin 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[2]      
Commitment Fee (unused portion) 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
[2]      
Line of credit facility, collateral Our Revolving Credit Facility is guaranteed by substantially all of Tesoro’s active domestic subsidiaries excluding TLGP, TLLP and its subsidiaries, and certain foreign subsidiaries, and is secured by substantially all of Tesoro’s active domestic subsidiaries’ crude oil and refined product inventories, cash and receivables.      
Line of credit facility, borrowing capacity, description Our Revolving Credit Facility provides for borrowings (including letters of credit) up to the lesser of the amount of a periodically adjusted borrowing base, which consists of Tesoro’s eligible cash and cash equivalents, receivables and petroleum inventories, net of the standard reserve as defined, or the Revolving Credit Facility’s total capacity of $3.0 billion.      
TLLP Revolving Credit Facility        
Credit Facility        
Total available capacity 1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= tso_RevolvingCreditFacilityThreeMember
     
Maturity date Dec. 02, 2019      
30 day Eurodollar (LIBOR) Rate 0.17%tso_EurodollarRate
/ us-gaap_CreditFacilityAxis
= tso_RevolvingCreditFacilityThreeMember
[3]      
Eurodollar Margin 2.75%tso_DebtInstrumentBasisSpreadOnVariableRateTwo
/ us-gaap_CreditFacilityAxis
= tso_RevolvingCreditFacilityThreeMember
[3]      
Base Rate 3.25%tso_DebtInstrumentBaseRate
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= tso_RevolvingCreditFacilityThreeMember
[3]      
Base Rate Margin 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= tso_RevolvingCreditFacilityThreeMember
[3]      
Commitment Fee (unused portion) 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= tso_RevolvingCreditFacilityThreeMember
[3]      
Line of credit facility, collateral The TLLP Revolving Credit Facility is non-recourse to Tesoro, except for TLGP, and is guaranteed by all of TLLP’s subsidiaries, with the exception of certain non-wholly owned subsidiaries acquired in the Rockies Natural Gas Business Acquisition, and secured by substantially all of TLLP’s assets.      
Line of credit facility, borrowing capacity, description Borrowings are available under the TLLP Revolving Credit Facility up to the total available revolving capacity of the facility.      
Term Loan Facility        
Credit Facility        
Total available capacity 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
     
Maturity date May 30, 2016      
Repayments under Term Loan Facility 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
     
Term Loan Facility interest rate at period end 2.42%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
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= us-gaap_SecuredDebtMember
     
30 day Eurodollar (LIBOR) Rate 0.17%tso_EurodollarRate
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
[4]      
Eurodollar Margin 2.25%tso_DebtInstrumentBasisSpreadOnVariableRateTwo
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
[4]      
Base Rate 3.25%tso_DebtInstrumentBaseRate
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
[4]      
Base Rate Margin 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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= us-gaap_SecuredDebtMember
[4]      
Commitment Fee (unused portion) 0.00%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
[4]      
Debt instrument, collateral The obligations under the Term Loan Facility are secured by all equity interests of Tesoro Refining & Marketing Company LLC and Tesoro Alaska Company LLC, the Tesoro and USA Gasoline trademarks and those trademarks containing the name “ARCO” acquired in the Los Angeles Acquisition, and junior liens on certain assets.      
4.250% Senior Notes due 2017        
Credit Facility        
Debt instrument interest rate 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A4.250SeniorNotesDue2017Member
     
Debt Instrument, Maturity Date Oct. 01, 2017      
Debt instrument, face amount 450,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A4.250SeniorNotesDue2017Member
     
Term (years) five      
Debt instrument, collateral These notes are unsecured obligations and guaranteed by certain of our domestic subsidiaries, excluding TLGP and TLLP and its subsidiaries.      
5.125% Senior Notes due 2024        
Credit Facility        
Debt instrument interest rate 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.125SeniorNotesdue2024Member
     
Debt Instrument, Maturity Date Apr. 01, 2024      
Debt instrument, face amount 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A5.125SeniorNotesdue2024Member
     
Term (years) ten-year      
Percentage redemption with equity proceeds 35.00%tso_DebtInstrumentRedemptionWithEquityProceeds
/ us-gaap_DebtInstrumentAxis
= tso_A5.125SeniorNotesdue2024Member
     
Debt Instrument, Redemption Price, Percentage 105.125%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.125SeniorNotesdue2024Member
     
5.375% Senior Notes due 2022        
Credit Facility        
Debt instrument interest rate 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.375SeniorNotesDue2022Member
     
Debt Instrument, Maturity Date Oct. 01, 2022      
Debt instrument, face amount 475,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= tso_A5.375SeniorNotesDue2022Member
     
Term (years) ten-year      
Percentage redemption with equity proceeds 35.00%tso_DebtInstrumentRedemptionWithEquityProceeds
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= tso_A5.375SeniorNotesDue2022Member
     
Redemption percentage 105.375%tso_RedemptionPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.375SeniorNotesDue2022Member
     
Debt instrument, collateral These notes are unsecured obligations and guaranteed by certain of our domestic subsidiaries, excluding TLGP and TLLP and its subsidiaries, and contain customary terms, events of default and covenants for an issuance of non-investment grade securities.      
9.750% Senior Notes due 2019        
Credit Facility        
Debt instrument interest rate 9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A9.750SeniorNotesDue2019Member
     
Debt Instrument, Maturity Date Jun. 01, 2019      
Debt Instrument, Repurchase Amount 329,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= tso_A9.750SeniorNotesDue2019Member
     
Debt instrument, premium paid 19,000,000tso_DebtInstrumentPremiumPaid
/ us-gaap_DebtInstrumentAxis
= tso_A9.750SeniorNotesDue2019Member
     
Amortization of Debt Discount (Premium) 8,000,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_DebtInstrumentAxis
= tso_A9.750SeniorNotesDue2019Member
     
Unamortized debt issuance expense $ 4,000,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_DebtInstrumentAxis
= tso_A9.750SeniorNotesDue2019Member
     
Debt instrument, collateral The notes are unsecured and are guaranteed by substantially all of our domestic subsidiaries.      
Redemption Period One | 5.125% Senior Notes due 2024        
Credit Facility        
Redemption premium percentage 2.563%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.125SeniorNotesdue2024Member
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= us-gaap_DebtInstrumentRedemptionPeriodOneMember
     
Redemption Period One | 5.375% Senior Notes due 2022        
Credit Facility        
Redemption premium percentage 2.688%tso_DebtInstrumentRedemptionPremiumPercentage
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= tso_A5.375SeniorNotesDue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
     
Redemption Period Two | 5.125% Senior Notes due 2024        
Credit Facility        
Redemption premium percentage 1.708%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.125SeniorNotesdue2024Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
     
Redemption Period Two | 5.375% Senior Notes due 2022        
Credit Facility        
Redemption premium percentage 1.792%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.375SeniorNotesDue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
     
Redemption Period Three | 5.125% Senior Notes due 2024        
Credit Facility        
Redemption premium percentage 0.854%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.125SeniorNotesdue2024Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
     
Redemption Period Three | 5.375% Senior Notes due 2022        
Credit Facility        
Redemption premium percentage 0.896%tso_DebtInstrumentRedemptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= tso_A5.375SeniorNotesDue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
     
[1] Borrowing base is the lesser of the amount of the periodically adjusted borrowing base or the agreement’s total capacity of $3.0 billion.
[2] We can elect the interest rate to apply to the facility between a base rate plus the base rate margin, or a Eurodollar rate, for the applicable term, plus the Eurodollar margin at the time of the borrowing. The applicable margin on the Revolving Credit Facility varies primarily based upon our credit ratings. Letters of credit outstanding under the Revolving Credit Facility incur fees at the Eurodollar margin rate.
[3] TLLP has the option to elect if the borrowings will bear interest at either, a base rate plus the base rate margin or a Eurodollar rate, for the applicable period, plus the Eurodollar margin at the time of the borrowing. The applicable margin varies based upon a certain leverage ratio, as defined by the TLLP Revolving Credit Facility. TLLP incurs commitment fees for the unused portion of the TLLP Revolving Credit Facility. Letters of credit outstanding under the Revolving Credit Facility incur fees at the Eurodollar margin rate.
[4] We can elect the interest rate to apply to the facility between a base rate plus the base rate margin, or a Eurodollar rate, for the applicable term, plus the Eurodollar margin at the time of the borrowing.