Condensed Consolidating Financial Information, Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash from (used in) operating activities	$ 689	$ 385	$ 663
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures	(298)	(297)	(437)
Proceeds from asset sales	7	2	1
Intercompany notes, net	0	0	0
Net cash from (used in) investing activities	(291)	(295)	(436)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from debt borrowings			282
Borrowings under revolver	312	216	418
Repayments under revolver	(295)	(66)	(484)
Repayments of debt	(329)	(3)	(2)
Proceeds from stock options exercised	12	5	4
Repurchases of common stock	(101)	(2)	(2)
Dividend payments	0	0	(49)
Excess tax benefits from equity-based compensation arrangements	13	3	2
Payments of distributions to noncontrolling interest	(9)	0	0
Proceeds from issuance of common units -Tesoro Logistics LP	288	0	0
Distributions to General Partner	0
Distributions to Common unitholders	0
Distributions to Subordinated unitholders	0
Net intercompany borrowings (repayments)	0	0	0
Financing costs and other	(37)	(8)	(3)
Net cash from (used in) financing activities	(146)	145	166
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	252	235	393
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	648	413	20
CASH AND CASH EQUIVALENTS, END OF YEAR	900	648	413
Tesoro Corporation [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash from (used in) operating activities	(7)	4	(11)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures	0	0	0
Proceeds from asset sales	0	0	0
Intercompany notes, net	266	(3)	(155)
Net cash from (used in) investing activities	266	(3)	(155)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from debt borrowings			282
Borrowings under revolver	0	66	418
Repayments under revolver	0	(66)	(484)
Repayments of debt	(328)	0	0
Proceeds from stock options exercised	12	5	4
Repurchases of common stock	(101)	(2)	(2)
Dividend payments			(49)
Excess tax benefits from equity-based compensation arrangements	0	0	0
Payments of distributions to noncontrolling interest	0
Proceeds from issuance of common units -Tesoro Logistics LP	0
Distributions to General Partner	50
Distributions to Common unitholders	31
Distributions to Subordinated unitholders	99
Net intercompany borrowings (repayments)	0	0	0
Financing costs and other	(22)	(4)	(3)
Net cash from (used in) financing activities	(259)	(1)	166
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	0	0	0
CASH AND CASH EQUIVALENTS, END OF YEAR	0	0	0
Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash from (used in) operating activities	765	517	598
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures	(293)	(296)	(399)
Proceeds from asset sales	7	2	1
Intercompany notes, net	0	0	0
Net cash from (used in) investing activities	(286)	(294)	(398)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from debt borrowings			0
Borrowings under revolver	0	0	0
Repayments under revolver	0	0	0
Repayments of debt	(1)	(3)	(2)
Proceeds from stock options exercised	0	0	0
Repurchases of common stock	0	0	0
Dividend payments			0
Excess tax benefits from equity-based compensation arrangements	13	3	2
Payments of distributions to noncontrolling interest	0
Proceeds from issuance of common units -Tesoro Logistics LP	0
Distributions to General Partner	0
Distributions to Common unitholders	39
Distributions to Subordinated unitholders	123
Net intercompany borrowings (repayments)	(451)	(22)	191
Financing costs and other	(9)	0	0
Net cash from (used in) financing activities	(286)	(22)	191
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	193	201	391
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	612	411	20
CASH AND CASH EQUIVALENTS, END OF YEAR	805	612	411
Non-Guarantors [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash from (used in) operating activities	(69)	(136)	76
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures	(5)	(1)	(38)
Proceeds from asset sales	0	0	0
Intercompany notes, net	0	0	0
Net cash from (used in) investing activities	(5)	(1)	(38)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from debt borrowings			0
Borrowings under revolver	312	150	0
Repayments under revolver	(295)	0	0
Repayments of debt	0	0	0
Proceeds from stock options exercised	0	0	0
Repurchases of common stock	0	0	0
Dividend payments			0
Excess tax benefits from equity-based compensation arrangements	0	0	0
Payments of distributions to noncontrolling interest	(9)
Proceeds from issuance of common units -Tesoro Logistics LP	288
Distributions to General Partner	(50)
Distributions to Common unitholders	(70)
Distributions to Subordinated unitholders	(222)
Net intercompany borrowings (repayments)	185	25	(36)
Financing costs and other	(6)	(4)	0
Net cash from (used in) financing activities	133	171	(36)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	59	34	2
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	36	2	0
CASH AND CASH EQUIVALENTS, END OF YEAR	95	36	2
Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash from (used in) operating activities	0	0	0
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures	0	0	0
Proceeds from asset sales	0	0	0
Intercompany notes, net	(266)	3	155
Net cash from (used in) investing activities	(266)	3	155
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from debt borrowings			0
Borrowings under revolver	0	0	0
Repayments under revolver	0	0	0
Repayments of debt	0	0	0
Proceeds from stock options exercised	0	0	0
Repurchases of common stock	0	0	0
Dividend payments			0
Excess tax benefits from equity-based compensation arrangements	0	0	0
Payments of distributions to noncontrolling interest	0
Proceeds from issuance of common units -Tesoro Logistics LP	0
Distributions to General Partner	0
Distributions to Common unitholders	0
Distributions to Subordinated unitholders	0
Net intercompany borrowings (repayments)	266	(3)	(155)
Financing costs and other	0	0	0
Net cash from (used in) financing activities	266	(3)	(155)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	0	0	0
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 0	$ 0	$ 0

The amount of cash distributions paid to subordinated unit-holders by an LLC or LP.

No definition available.

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- Definition

Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.1)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

The increase (decrease) during the reporting period in cash and cash equivalents. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

+ References

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-Publisher FASB

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-Paragraph 26

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- Definition

The amount of cash distributions paid to a common shareholder or unit-holder by a LLC or LP.

+ References

No definition available.

+ Details

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- Definition

Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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-Name Emerging Issues Task Force (EITF)

-Number 00-15

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

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-Paragraph 24

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- Definition

Distributions from earnings to the general partner of a partnership included in the consolidated financial statements.

+ References

No definition available.

+ Details

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- Definition

The net cash inflow or outflow from financing activity for the period.

+ References

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- Definition

The net cash inflow or outflow from investing activity.

+ References

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- Definition

The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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- Definition

The cash outflow to reacquire common stock during the period.

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6513228

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The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

+ References

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The cash outflow for the return on capital for noncontrolled interest in the entity.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from the issuance of common limited partners units during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 14

-Subparagraph (a)

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-Subparagraph a

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 19

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash inflow or outflow associated with long-term loans for related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from (Payments for) Advances to Affiliates.

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