Condensed Consolidating Financial Information, Statement of Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Condensed Financial Statements, captions
REVENUES	$ 6,463		$ 9,933
Costs and Expenses:
Cost of sales	5,340		8,948
Operating, selling, general and administrative expenses	600		622
Depreciation and amortization expense	179		130
(Gain) loss on asset disposals and impairments	4		(5)
Operating Income	340		238
Equity in earnings of subsidiaries	0		0
Interest and financing costs, net	(55)	[1]	(77)	[1]
Other income (expense), net	(1)		(1)
Earnings Before Income Taxes	284		160
Income tax expense (benefit)	96		56
Net earnings from continuing operations	188		104
Loss from discontinued operations, net of tax	0		(1)
Net Earnings	188		103
Less: Net earnings from continuing operations attributable to noncontrolling interest	43		25
Net Earnings Attributable to Tesoro Corporation	145		78
Comprehensive Income
Total comprehensive income	188		103
Less: Noncontrolling interest in comprehensive income	43		25
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION	145		78
Parent
Condensed Financial Statements, captions
REVENUES	0		0
Costs and Expenses:
Cost of sales	0		0
Operating, selling, general and administrative expenses	4		1
Depreciation and amortization expense	0		0
(Gain) loss on asset disposals and impairments	0		0
Operating Income	(4)		(1)
Equity in earnings of subsidiaries	157		86	[2]
Interest and financing costs, net	(11)		(8)
Other income (expense), net	0		0
Earnings Before Income Taxes	142		77
Income tax expense (benefit)	(3)	[3]	(1)	[3]
Net earnings from continuing operations			78
Loss from discontinued operations, net of tax			0
Net Earnings	145		78
Less: Net earnings from continuing operations attributable to noncontrolling interest	0		0
Net Earnings Attributable to Tesoro Corporation	145		78
Comprehensive Income
Total comprehensive income	145		78
Less: Noncontrolling interest in comprehensive income	0		0
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION	145		78
Guarantor Subsidiaries
Condensed Financial Statements, captions
REVENUES	6,999		11,564
Costs and Expenses:
Cost of sales	5,993		10,664
Operating, selling, general and administrative expenses	609		612
Depreciation and amortization expense	134		113
(Gain) loss on asset disposals and impairments	4		(1)
Operating Income	259		176
Equity in earnings of subsidiaries	16		14	[2]
Interest and financing costs, net	(18)		(59)
Other income (expense), net	(4)		(1)
Earnings Before Income Taxes	253		130
Income tax expense (benefit)	95	[3]	51	[3]
Net earnings from continuing operations			79
Loss from discontinued operations, net of tax			(1)
Net Earnings	158		78
Less: Net earnings from continuing operations attributable to noncontrolling interest	0		0
Net Earnings Attributable to Tesoro Corporation	158		78
Comprehensive Income
Total comprehensive income	158		78
Less: Noncontrolling interest in comprehensive income	0		0
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION	158		78
Non- Guarantors
Condensed Financial Statements, captions
REVENUES	914		1,610
Costs and Expenses:
Cost of sales	661		1,476
Operating, selling, general and administrative expenses	123		58
Depreciation and amortization expense	45		17
(Gain) loss on asset disposals and impairments	0		(4)
Operating Income	85		63
Equity in earnings of subsidiaries	0		0	[2]
Interest and financing costs, net	(26)		(18)
Other income (expense), net	3		8
Earnings Before Income Taxes	62		53
Income tax expense (benefit)	4	[3]	6	[3]
Net earnings from continuing operations			47
Loss from discontinued operations, net of tax			0
Net Earnings	58		47
Less: Net earnings from continuing operations attributable to noncontrolling interest	43		25
Net Earnings Attributable to Tesoro Corporation	15		22
Comprehensive Income
Total comprehensive income	58		47
Less: Noncontrolling interest in comprehensive income	43		25
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION	15		22
Eliminations
Condensed Financial Statements, captions
REVENUES	(1,450)		(3,241)
Costs and Expenses:
Cost of sales	(1,314)		(3,192)
Operating, selling, general and administrative expenses	(136)		(49)
Depreciation and amortization expense	0		0
(Gain) loss on asset disposals and impairments	0		0
Operating Income	0		0
Equity in earnings of subsidiaries	(173)		(100)	[2]
Interest and financing costs, net	0		8
Other income (expense), net	0		(8)
Earnings Before Income Taxes	(173)		(100)
Income tax expense (benefit)	0	[3]	0	[3]
Net earnings from continuing operations			(100)
Loss from discontinued operations, net of tax			0
Net Earnings	(173)		(100)
Less: Net earnings from continuing operations attributable to noncontrolling interest	0		0
Net Earnings Attributable to Tesoro Corporation	(173)		(100)
Comprehensive Income
Total comprehensive income	(173)		(100)
Less: Noncontrolling interest in comprehensive income	0		0
COMPREHENSIVE INCOME ATTRIBUTABLE TO TESORO CORPORATION	$ (173)		$ (100)

[1] 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.

[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] 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.