Operating Segments, Results (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended		3 Months Ended				0 Months Ended
	Jan. 01, 2015	Apr. 01, 2013	Mar. 31, 2015		Mar. 31, 2014		Jan. 01, 2014
Segment Reporting Information
Total Revenues			$ 6,463		$ 9,933
OPERATING INCOME			340		238
Reconciliation of Operating Income from Segments to Consolidated
Total Segment Operating Income			424		264
Corporate and unallocated costs			(84)	[1]	(26)	[1]
Segment Reporting Information, Income before Income Taxes
Interest and financing costs, net			(55)	[2]	(77)	[2]
Other expense, net			(1)		(1)
Earnings Before Income Taxes			284		160
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Total Depreciation and Amortization Expense			179		130
Total Capital Expenditures			260		103
Segment Reporting Table Footnotes
Federal and state motor fuel taxes on sales by the retail segment			140		141
Stock-based compensation expense (benefit)			28		(18)
Debt redemption charges			0		(31)
Intersegment pricing methodology effective date		Apr. 01, 2013
Intersegment pricing methodology, new inclusion effective date	Jan. 01, 2015
Refining
Segment Reporting Information
OPERATING INCOME			190	[3]	185	[3]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Total Depreciation and Amortization Expense			119		101
Total Capital Expenditures			184		68
Refining | Refined products
Segment Reporting Information
Total Revenues			5,838		9,500
Refining | Crude oil resales and other
Segment Reporting Information
Total Revenues			299		272
TLLP
Segment Reporting Information
OPERATING INCOME			108	[4]	60	[4]
Reconciliation of Operating Income from Segments to Consolidated
Corporate and unallocated costs			(12)		(4)
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Total Depreciation and Amortization Expense			44		16
Total Capital Expenditures			66		26
TLLP | Gathering
Segment Reporting Information
Total Revenues			77		25
TLLP | Processing
Segment Reporting Information
Total Revenues			67		0
TLLP | Terminalling and transportation
Segment Reporting Information
Total Revenues			119		102
Retail
Segment Reporting Information
OPERATING INCOME			126	[3]	19	[3]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Total Depreciation and Amortization Expense			12		10
Total Capital Expenditures			4		5
Retail | Fuel
Segment Reporting Information
Total Revenues			2,195	[5]	3,024	[5]
Retail | Other Non-fuel
Segment Reporting Information
Total Revenues			16	[6]	61	[6]
Intersegment sales
Segment Reporting Information
Total Revenues			(2,148)		(3,051)
Corporate
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Total Depreciation and Amortization Expense			4		3
Total Capital Expenditures			6		4
Segment Reporting Table Footnotes
Stock-based compensation expense (benefit)			28		(18)
5.5% Senior Notes due 2019
Segment Reporting Table Footnotes
Debt redemption charges					31
Debt instrument interest rate					5.50%
Debt instrument, maturity date					Oct. 15, 2019
Pro Forma
Segment Reporting Table Footnotes
Intersegment pricing methodology, new inclusion effective date							Jan. 01, 2014
Pro Forma | Refining
Segment Reporting Information
OPERATING INCOME					(28)	[3]
Pro Forma | Retail
Segment Reporting Information
OPERATING INCOME					$ 28	[3]

[1] Includes stock-based compensation expense of $28 million and benefit of $18 million for the three months ended March 31, 2015 and 2014, respectively. The significant impact to stock-based compensation expense during the three months ended March 31, 2015 compared to the prior period is primarily a result of changes in Tesoro’s stock price.

[2] Includes charges totaling $31 million for premiums and unamortized debt issuance costs associated with the redemption of the 5.50% Senior Notes due 2019 during the three months ended March 31, 2014.

[3] Our refining segment uses RINs to satisfy its obligations under the Renewable Fuels Standard, in addition to physically blending required biofuels. Effective April 1, 2013, we changed our intersegment pricing methodology and no longer reduced the amount retail pays for the biofuels by the market value of the RINs due to significant volatility in the value of RINs. At the end of 2014, given the price of RINs has become more transparent in the price of biofuels, we determined our intersegment pricing methodology should include the market value of RINs as a reduction to the price our retail segment pays to our refining segment. We made this change effective January 1, 2015. We have not adjusted financial information presented for our refining and retail segments for the period ended March 31, 2014. Had we made this change effective January 1, 2014, operating income in our refining segment would have been reduced by $28 million with a corresponding increase to operating income in our retail segment.

[4] We present TLLP’s segment operating income net of general and administrative expenses totaling $12 million and $4 million representing TLLP’s corporate costs for the three months ended March 31, 2015 and 2014, respectively, that are not allocated to TLLP’s operating segments.

[5] Federal and state motor fuel taxes on sales by our retail segment are included in both revenues and cost of sales in our condensed statements of consolidated operations. These taxes totaled $140 million and $141 million for the three months ended March 31, 2015 and 2014, respectively.

[6] Includes merchandise revenue for the three months ended March 31, 2014.