Tesoro Logistics LP, Credit Facility (Details) (TLLP Revolving Credit Facility)	Jun. 30, 2012
TLLP Revolving Credit Facility
Credit Facility
Amended date	3/30/2012

Date at which the credit facility was amended during the year

No definition available.

Name:	tso_AmendedDate
Namespace Prefix:	tso_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	instant