Condensed Consolidating Financial Information, Cash Flows (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES
Net cash from (used in) operating activities	$ (148)	$ (150)
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES
Capital expenditures	(271)	(119)
Intercompany notes, net	0	0
Other investing activities	(2)	10
Net cash used in investing activities	(273)	(109)
Cash Flows From (Used In) Financing Activities
Borrowings under revolving credit agreements	99us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit
Proceeds from debt offering	0us-gaap_ProceedsFromIssuanceOfDebt	300us-gaap_ProceedsFromIssuanceOfDebt
Repayments on revolving credit agreements	(124)us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Repayments of debt	0	(301)
Dividend payments	(54)us-gaap_PaymentsOfDividends	(33)us-gaap_PaymentsOfDividends
Net proceeds from issuance of Tesoro Logistics LP common units	24	0
Distributions to noncontrolling interest	(44)us-gaap_PaymentsToMinorityShareholders	(20)us-gaap_PaymentsToMinorityShareholders
Purchases of common stock	(19)	(100)
Taxes paid related to net share settlement of equity awards	(39)	0
Net intercompany borrowings (repayments)	0	0
Premium paid on notes redemption	0us-gaap_PaymentsOfDebtIssuanceCosts	(19)us-gaap_PaymentsOfDebtIssuanceCosts
Distributions to TLLP unitholders and general partner	0us-gaap_PaymentsOfCapitalDistribution	0us-gaap_PaymentsOfCapitalDistribution
Other financing activities	37	(8)
Net cash used in financing activities	(120)	(181)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(541)	(440)
Cash and Cash Equivalents, Beginning of Period	1,000	1,238
Cash and Cash Equivalents, End of Period	459	798
Parent
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES
Net cash from (used in) operating activities	(10)	(17)
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES
Capital expenditures	0	0
Intercompany notes, net	106	168
Other investing activities	0	0
Net cash used in investing activities	106	168
Cash Flows From (Used In) Financing Activities
Borrowings under revolving credit agreements	0
Proceeds from debt offering		300
Repayments on revolving credit agreements	0
Repayments of debt		(300)
Dividend payments	(54)	(33)
Net proceeds from issuance of Tesoro Logistics LP common units	0
Distributions to noncontrolling interest	0	0
Purchases of common stock	(19)	(100)
Taxes paid related to net share settlement of equity awards	(39)
Net intercompany borrowings (repayments)	0	0
Premium paid on notes redemption		(19)
Distributions to TLLP unitholders and general partner	10	4
Other financing activities	6	(3)
Net cash used in financing activities	(96)	(151)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
Cash and Cash Equivalents, Beginning of Period	0	0
Cash and Cash Equivalents, End of Period	0	0
Guarantor Subsidiaries
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES
Net cash from (used in) operating activities	(350)	154
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES
Capital expenditures	(191)	(92)
Intercompany notes, net	0	0
Other investing activities	(2)	0
Net cash used in investing activities	(193)	(92)
Cash Flows From (Used In) Financing Activities
Borrowings under revolving credit agreements	0
Proceeds from debt offering		0
Repayments on revolving credit agreements	0
Repayments of debt		(1)
Dividend payments	0	0
Net proceeds from issuance of Tesoro Logistics LP common units	0
Distributions to noncontrolling interest	0	0
Purchases of common stock	0	0
Taxes paid related to net share settlement of equity awards	0
Net intercompany borrowings (repayments)	(37)	(501)
Premium paid on notes redemption		0
Distributions to TLLP unitholders and general partner	6	5
Other financing activities	31	0
Net cash used in financing activities	0	(497)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(543)	(435)
Cash and Cash Equivalents, Beginning of Period	943	1,161
Cash and Cash Equivalents, End of Period	400	726
Non- Guarantors
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES
Net cash from (used in) operating activities	212	(287)
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES
Capital expenditures	(80)	(27)
Intercompany notes, net	0	0
Other investing activities	0	10
Net cash used in investing activities	(80)	(17)
Cash Flows From (Used In) Financing Activities
Borrowings under revolving credit agreements	99
Proceeds from debt offering		0
Repayments on revolving credit agreements	(124)
Repayments of debt		0
Dividend payments	0	0
Net proceeds from issuance of Tesoro Logistics LP common units	24
Distributions to noncontrolling interest	(44)	(20)
Purchases of common stock	0	0
Taxes paid related to net share settlement of equity awards	0
Net intercompany borrowings (repayments)	(69)	333
Premium paid on notes redemption		0
Distributions to TLLP unitholders and general partner	(16)	(9)
Other financing activities	0	(5)
Net cash used in financing activities	(130)	299
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2	(5)
Cash and Cash Equivalents, Beginning of Period	57	77
Cash and Cash Equivalents, End of Period	59	72
Eliminations
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES
Net cash from (used in) operating activities	0	0
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES
Capital expenditures	0	0
Intercompany notes, net	(106)	(168)
Other investing activities	0	0
Net cash used in investing activities	(106)	(168)
Cash Flows From (Used In) Financing Activities
Borrowings under revolving credit agreements	0
Proceeds from debt offering		0
Repayments on revolving credit agreements	0
Repayments of debt		0
Dividend payments	0	0
Net proceeds from issuance of Tesoro Logistics LP common units	0
Distributions to noncontrolling interest	0	0
Purchases of common stock	0	0
Taxes paid related to net share settlement of equity awards	0
Net intercompany borrowings (repayments)	106	168
Premium paid on notes redemption		0
Distributions to TLLP unitholders and general partner	0	0
Other financing activities	0	0
Net cash used in financing activities	106	168
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
Cash and Cash Equivalents, Beginning of Period	0	0
Cash and Cash Equivalents, End of Period	$ 0	$ 0

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585