Operating Segments, Results (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended							3 Months Ended				9 Months Ended						3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				1 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012	Sep. 30, 2013 Continuing Operations	Dec. 31, 2012 Continuing Operations	Sep. 30, 2013 Refining:		Sep. 30, 2012 Refining:		Sep. 30, 2013 Refining:		Sep. 30, 2012 Refining:		Sep. 30, 2013 Refining: Continuing Operations	Dec. 31, 2012 Refining: Continuing Operations	Sep. 30, 2013 Refined products	Sep. 30, 2012 Refined products	Sep. 30, 2013 Refined products	Sep. 30, 2012 Refined products	Sep. 30, 2013 Crude oil and other	Sep. 30, 2012 Crude oil and other	Sep. 30, 2013 Crude oil and other	Sep. 30, 2012 Crude oil and other	Sep. 30, 2013 Retail:	Sep. 30, 2012 Retail:	Sep. 30, 2013 Retail:	Sep. 30, 2012 Retail:	Sep. 30, 2013 Retail: Continuing Operations	Dec. 31, 2012 Retail: Continuing Operations	Sep. 30, 2013 Fuel (a)		Sep. 30, 2012 Fuel (a)		Sep. 30, 2013 Fuel (a)		Sep. 30, 2012 Fuel (a)		Sep. 30, 2013 Merchandise and other	Sep. 30, 2012 Merchandise and other	Sep. 30, 2013 Merchandise and other	Sep. 30, 2012 Merchandise and other	Sep. 30, 2013 Intersegment sales from Refining to Retail	Sep. 30, 2012 Intersegment sales from Refining to Retail	Sep. 30, 2013 Intersegment sales from Refining to Retail	Sep. 30, 2012 Intersegment sales from Refining to Retail	Sep. 30, 2013 Corporate	Sep. 30, 2012 Corporate	Sep. 30, 2013 Corporate	Sep. 30, 2012 Corporate	Sep. 30, 2013 Corporate Continuing Operations	Dec. 31, 2012 Corporate Continuing Operations	Jun. 30, 2013 CPUC	Sep. 30, 2013 CPUC	Sep. 30, 2013 TAPS Litigation	Dec. 31, 2008 TAPS Litigation	Sep. 30, 2013 Washington Refinery Fire
Segment Reporting Information
Revenues																						$ 10,674	$ 7,633	$ 25,564	$ 21,424	$ 374	$ 169	$ 1,450	$ 456							$ 3,362	[1]	$ 1,644	[1]	$ 7,087	[1]	$ 4,357	[1]	$ 70	$ 57	$ 177	$ 157	$ (3,239)	$ (1,559)	$ (6,793)	$ (4,110)
Total Revenues	11,241		7,944		27,485		22,284
OPERATING INCOME (LOSS)	146		483		703		1,283					141	[2]	583	[2]	819	[2]	1,406	[2]											56	18	96	85
Reconciliation of Operating Income from Segments to Consolidated
Total Segment Operating Income	197		601		915		1,491
Corporate and unallocated costs (c)	(51)	[3]	(118)	[3]	(212)	[3]	(208)	[3]
Segment Reporting Information, Income before Income Taxes
Interest and financing costs, net	(47)		(66)		(110)		(136)
Interest income	0		1		1		2
Equity in earnings of equity method investment	9		0		12		0
Other income (expense), net (d)	13	[4]	(3)	[4]	65	[4]	(22)	[4]
EARNINGS BEFORE INCOME TAXES	121		415		671		1,127
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Depreciation and Amortization Expense	140		109		356		307					125		91		314		263												9	9	26	27																			6	9	16	17
Capital Expenditures	123		128		412		368					111		111		376		314												10	14	26	45																			2	3	10	9
Identifiable Assets Related to Continuing Operations	14,116				14,116				10,702	14,116	10,347									11,601	8,010													848	716																					1,667	1,621
Table Footnotes
Federal and state motor fuel taxes on sales by our retail segment	151		134		423		333
Business interruption insurance recoveries																																																														16
Stock-based compensation expense (benefit)	(13)		72		34		93																																													(13)	68	31	87
Transaction and integration costs	14				47
Other income recognized for legal matters																																																										54	54		50
Reversal of previously established accrual																																																												$ 16

[1] 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 $151 million and $134 million for the three months ended September 30, 2013 and 2012, respectively, and $423 million and $333 million for the nine months ended September 30, 2013 and 2012, respectively.

[2] Includes $16 million in business interruption insurance recoveries for the three and nine months ended September 30, 2013.

[3] Includes stock-based compensation benefit of $13 million and expense of $68 million for the three months ended September 30, 2013 and 2012, respectively, and expense of $31 million and $87 million for the nine months ended September 30, 2013 and 2012, respectively. The significant impact to stock-based compensation expense during the three and nine months ended September 30, 2013 compared to the prior periods is primarily a result of changes in Tesoro’s stock price. Also includes transaction and integration costs related to the Carson Acquisition and TLLP’s purchase of the Northwest Products System of $14 million and $47 million for the three and nine months ended September 30, 2013, respectively.

[4] Includes $54 million in refunds from a settlement of a rate proceeding from the CPUC for the nine months ended September 30, 2013 and the release of a $16 million legal reserve as a result of the favorable settlement of litigation for the three and nine months ended September 30, 2013. Also includes accruals related to certain legal matters partially offset by receipts associated with the settlement of a pipeline rate proceeding for the nine months ended September 30, 2012.