Operating Segments, Results (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information, Operating Income
REVENUES	$ 8,445	$ 11,151	$ 11,104	$ 9,933	[1]	$ 10,116	$ 11,241	$ 8,897	$ 7,347	[1]	$ 40,633		$ 37,601		$ 29,809
Operating Income (Loss)	282	702	410	238	[1]	52	146	364	193	[1]	1,632		755		1,621
Reconciliation of Operating Income from Segments to Consolidated
Total Segment Operating Income											1,918		1,067		1,897
Corporate and unallocated costs											(286)	[2]	(312)	[2]	(276)	[2]
Segment Reporting Information, Income (Loss) before Income Taxes
Interest and financing costs, net											(235)	[3]	(149)	[3]	(165)	[3]
Equity in earnings of equity method investments											10		11		0
Other income (expense), net											57	[4]	63	[4]	(26)	[4]
Earnings Before Income Taxes											1,464		680		1,430
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Depreciation and amortization expense											562		489		418
Capital Expenditures											779		558		542
Identifiable Assets Related to Continuing Operations	16,584					13,389					16,584		13,389
Table Footnotes
Excise and sales taxes											581		567		467
Insurance recoveries											7
Stock-based compensation expense											55		80		105
Transactions costs											5
Debt redemption charges											41		0		5
Reversal of previously established accrual													16
Washington Refinery Fire
Table Footnotes
Insurance recoveries													16
CPUC
Table Footnotes
Gain (loss) related to litigation settlement											59		54
Continuing Operations
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Identifiable Assets Related to Continuing Operations	16,584					13,389					16,584		13,389		10,347
Refining
Segment Reporting Information, Operating Income
Operating Income (Loss)											1,288	[5]	873	[5]	1,714	[5]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Depreciation and amortization expense											428		386		340
Capital Expenditures											451		413		362
Refining | Refined Products
Segment Reporting Information, Operating Income
REVENUES											38,112		34,962		28,338
Refining | Crude Oil Resales And Other
Segment Reporting Information, Operating Income
REVENUES											1,456		1,969		890
Refining | Continuing Operations
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Identifiable Assets Related to Continuing Operations	9,652					9,438					9,652		9,438		7,619
TLLP
Segment Reporting Information, Operating Income
Operating Income (Loss)											206	[6]	74	[6]	57	[6]
Reconciliation of Operating Income from Segments to Consolidated
Corporate and unallocated costs											(39)		(17)		(9)
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Depreciation and amortization expense											77		45		15
Capital Expenditures											244		83		94
TLLP | Gathering
Segment Reporting Information, Operating Income
REVENUES											137		90		72
TLLP | Processing
Segment Reporting Information, Operating Income
REVENUES											23		0		0
TLLP | Terminalling, Transportation And Storage
Segment Reporting Information, Operating Income
REVENUES											442		223		92
TLLP | Continuing Operations
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Identifiable Assets Related to Continuing Operations	4,814					1,533					4,814		1,533		391
Retail
Segment Reporting Information, Operating Income
Operating Income (Loss)											424		120		126
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Depreciation and amortization expense											42		37		36
Capital Expenditures											54		40		73
Retail | Fuel
Segment Reporting Information, Operating Income
REVENUES											12,518	[7]	10,087	[7]	5,888	[7]
Retail | Merchandise And Other
Segment Reporting Information, Operating Income
REVENUES											240		239		207
Retail | Continuing Operations
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Identifiable Assets Related to Continuing Operations	863					959					863		959		716
Intersegment sales
Segment Reporting Information, Operating Income
REVENUES											(12,295)		(9,969)		(5,678)
Corporate
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Depreciation and amortization expense											15		21		27
Capital Expenditures											30		22		13
Table Footnotes
Stock-based compensation expense											55		79		99
Corporate | Continuing Operations
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Identifiable Assets Related to Continuing Operations	1,255					1,459					1,255		1,459		1,621
5.500% Senior Notes due 2019
Table Footnotes
Debt redemption charges											31
5.875% Senior Notes due 2020
Table Footnotes
Debt redemption charges											10
Rockies Natural Gas Business
Table Footnotes
Transactions costs											19
Los Angeles Acquisition
Table Footnotes
Transactions costs													$ 14		$ 6

[1] The amounts shown above may differ from those previously reported in our quarterly reports on Form 10-Q for the quarter ended March 31, 2013 due to the sale of the Hawaii Business in September 2013 as discussed in Note 4. The results of operations of the Hawaii Business have been presented as discontinued operations for all periods presented.

[2] Includes stock-based compensation expense of $55 million, $79 million and $99 million for the years ended December 31, 2014, 2013 and 2012, respectively. The significant impact to stock-based compensation expense during the year ended December 31, 2014 compared to the prior years is primarily a result of changes in Tesoro’s stock price. Also includes TLLP’s transaction and integration costs of $19 million related to the Rockies Natural Gas Business acquisition for the year ended December 31, 2014 and our transaction costs related to the Los Angeles Acquisition of $14 million and $6 million for the years ended December 31, 2013 and 2012, respectively.

[3] Includes charges totaling $31 million and $10 million for premiums and unamortized debt issuance costs associated with the redemption of the 2019 Notes and 2020 Notes, respectively, during the year ended December 31, 2014.

[4] Includes $59 million in refunds and settlements approved by the CPUC related to rates charged on the crude products pipeline network for the year ended December 31, 2014. Also includes $54 million in refunds from a settlement of a rate proceeding from the CPUC, and the release of a $16 million legal reserve as a result of the favorable settlement of litigation for the year ended December 31, 2013 and accruals related to certain legal matters partially offset by receipts associated with the settlement of a pipeline rate proceeding for the year ended December 31, 2012.

[5] Includes business interruption recoveries of $16 million for the year ended December 31, 2013, related to the April 2010 incident at our Washington refinery.

[6] We present TLLP’s segment operating income net of general and administrative expenses totaling $39 million, $17 million and $9 million representing TLLP’s corporate costs for the years ended December 31, 2014, 2013 and 2012, respectively, that are not allocated to TLLP’s operating segments.

[7] Federal and state motor fuel taxes on sales by our retail segment are included in both revenues and cost of sales in our statements of consolidated operations. These taxes totaled $581 million, $567 million and $467 million for the years ended December 31, 2014, 2013 and 2012, respectively.