Condensed Consolidating Financial Information, Statement of Operations and Comprehensive Income (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
Condensed Financial Statements, captions
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
COSTS AND EXPENSES:
Cost of sales	7,282	9,594	9,867	8,948	[1]	9,258	10,355	7,909	6,563	[1]	35,691		34,085		26,045
Operating, selling, general and administrative expenses											2,744		2,248		1,702
Depreciation and amortization expense											562		489		418
Loss on asset disposals and impairments											4		24		23
OPERATING INCOME	282	702	410	238	[1]	52	146	364	193	[1]	1,632		755		1,621
Equity in earnings (loss) of subsidiaries											0		0	[2]	0	[2]
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
Income tax expense (benefit)											547	[5]	246	[5]	527	[5]
NET EARNINGS FROM CONTINUING OPERATIONS	159	414	240	104	[1]	6	74	249	105	[1]	917		434		903
Earnings (loss) from discontinued operations, net of tax	(27)	(1)	0	(1)	[1]	(3)	35	(11)	(1)	[1]	(29)		20		(133)
Net earnings	132	413	240	103	[1]	3	109	238	104	[1]	888		454		770
Less: Net earnings from continuing operations attributable to noncontrolling interest											45		42		27
NET EARNINGS ATTRIBUTABLE TO TESORO CORPORATION	145	396	224	78	[1]	(7)	99	227	93	[1]	843		412		743
COMPREHENSIVE INCOME
Total comprehensive income											791		539		708
Less: Noncontrolling interest in comprehensive income											45		42		27
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION											746		497		681
Parent
Condensed Financial Statements, captions
REVENUES											0		0		0
COSTS AND EXPENSES:
Cost of sales											0		0		0
Operating, selling, general and administrative expenses											10		12		13
Depreciation and amortization expense											0		0		0
Loss on asset disposals and impairments											0		0		0
OPERATING INCOME											(10)		(12)		(13)
Equity in earnings (loss) of subsidiaries											876		386	[2]	758	[2]
Interest and financing costs, net											(39)		(19)		(4)
Equity in earnings of equity method investments											0		0
Other income (expense), net											2		0		0
EARNINGS BEFORE INCOME TAXES											829		355		741
Income tax expense (benefit)											(14)	[5]	(8)	[5]	(2)	[5]
NET EARNINGS FROM CONTINUING OPERATIONS											843		363		743
Earnings (loss) from discontinued operations, net of tax											0		49		0
Net earnings											843		412		743
Less: Net earnings from continuing operations attributable to noncontrolling interest											0		0		0
NET EARNINGS ATTRIBUTABLE TO TESORO CORPORATION											843		412		743
COMPREHENSIVE INCOME
Total comprehensive income											746		497		681
Less: Noncontrolling interest in comprehensive income											0		0		0
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION											746		497		681
Guarantor Subsidiaries
Condensed Financial Statements, captions
REVENUES											45,904		43,973		37,004
COSTS AND EXPENSES:
Cost of sales											41,330		40,787		33,412
Operating, selling, general and administrative expenses											2,675		2,066		1,598
Depreciation and amortization expense											481		447		402
Loss on asset disposals and impairments											8		21		21
OPERATING INCOME											1,410		652		1,571
Equity in earnings (loss) of subsidiaries											48		30	[2]	16	[2]
Interest and financing costs, net											(126)		(110)		(151)
Equity in earnings of equity method investments											9		11
Other income (expense), net											55		63		(26)
EARNINGS BEFORE INCOME TAXES											1,396		646		1,410
Income tax expense (benefit)											521	[5]	243	[5]	533	[5]
NET EARNINGS FROM CONTINUING OPERATIONS											875		403		877
Earnings (loss) from discontinued operations, net of tax											(29)		(29)		(133)
Net earnings											846		374		744
Less: Net earnings from continuing operations attributable to noncontrolling interest											0		0		0
NET EARNINGS ATTRIBUTABLE TO TESORO CORPORATION											846		374		744
COMPREHENSIVE INCOME
Total comprehensive income											846		374		744
Less: Noncontrolling interest in comprehensive income											0		0		0
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION											846		374		744
Non- Guarantors
Condensed Financial Statements, captions
REVENUES											6,147		4,697		2,906
COSTS AND EXPENSES:
Cost of sales											5,497		4,365		2,734
Operating, selling, general and administrative expenses											341		172		91
Depreciation and amortization expense											81		42		16
Loss on asset disposals and impairments											(4)		3		2
OPERATING INCOME											232		115		63
Equity in earnings (loss) of subsidiaries											0		0	[2]	0	[2]
Interest and financing costs, net											(70)		(20)		(10)
Equity in earnings of equity method investments											1		0
Other income (expense), net											0		0		0
EARNINGS BEFORE INCOME TAXES											163		95		53
Income tax expense (benefit)											40	[5]	11	[5]	(4)	[5]
NET EARNINGS FROM CONTINUING OPERATIONS											123		84		57
Earnings (loss) from discontinued operations, net of tax											0		0		0
Net earnings											123		84		57
Less: Net earnings from continuing operations attributable to noncontrolling interest											45		42		27
NET EARNINGS ATTRIBUTABLE TO TESORO CORPORATION											78		42		30
COMPREHENSIVE INCOME
Total comprehensive income											123		84		57
Less: Noncontrolling interest in comprehensive income											45		42		27
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION											78		42		30
Eliminations
Condensed Financial Statements, captions
REVENUES											(11,418)		(11,069)		(10,101)
COSTS AND EXPENSES:
Cost of sales											(11,136)		(11,067)		(10,101)
Operating, selling, general and administrative expenses											(282)		(2)		0
Depreciation and amortization expense											0		0		0
Loss on asset disposals and impairments											0		0		0
OPERATING INCOME											0		0		0
Equity in earnings (loss) of subsidiaries											(924)		(416)	[2]	(774)	[2]
Interest and financing costs, net											0		0		0
Equity in earnings of equity method investments											0		0
Other income (expense), net											0		0		0
EARNINGS BEFORE INCOME TAXES											(924)		(416)		(774)
Income tax expense (benefit)											0	[5]	0	[5]	0	[5]
NET EARNINGS FROM CONTINUING OPERATIONS											(924)		(416)		(774)
Earnings (loss) from discontinued operations, net of tax											0		0		0
Net earnings											(924)		(416)		(774)
Less: Net earnings from continuing operations attributable to noncontrolling interest											0		0		0
NET EARNINGS ATTRIBUTABLE TO TESORO CORPORATION											(924)		(416)		(774)
COMPREHENSIVE INCOME
Total comprehensive income											(924)		(416)		(774)
Less: Noncontrolling interest in comprehensive income											0		0		0
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION											$ (924)		$ (416)		$ (774)

[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] Revised to conform to current period presentation of equity in earnings of subsidiaries that reflects equity in earnings of subsidiaries within the guarantor and non-guarantor columns net of intercompany amounts.

[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] The income tax expense (benefit) reflected in each column does not include any tax effect of the equity in earnings from corporate subsidiaries, but does include the tax effect of the corporate partners’ share of partnership income.