Tesoro Logistics LP, Contractual Terms Of Agreements With Tesoro Logistics LP (Details)	6 Months Ended
Jun. 30, 2012
Long-term Purchase Commitment
Minimum throughput of crude oil per month (thousand barrels per day)	65
Price per barrel of crude oil (dollar per barrel)	0.55
Throughput agreement made in connection with the Contribution of the Terminal
Long-term Purchase Commitment
Agreement time period (years)	10- year
Various pipeline transportation, trucking, terminal distribution and storage services agreement
Long-term Purchase Commitment
Agreement time period (years)	2016 through 2022
Number of contract renewals (renewals)	2
Renewal terms (years)	5 years
Trucking transportation agreement
Long-term Purchase Commitment
Number of contract renewals (renewals)	1
Renewal terms (years)	5 years
Omnibus agreement with subsidiary
Long-term Purchase Commitment
Omnibus or administrative fees received	2.5

Description of the nature of payments to a managing member or general partner, affiliate of a managing member or general partner, or affiliate of a limited liability company (LLC) or limited partnership (LP) for administrative services provided to the LLC or LP, for example, but is not limited to, salaries, rent, or other overhead costs. Includes a description of the services performed and the amount reimbursed for such services.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 57

-Paragraph 2

-Subparagraph a, b, c, d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AdministrativeFeesDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration