Tesoro Logistics LP Transactions to Purchase Terminalling and Pipeline Assets (Details) (West Coast Logistics Assets, USD $) In Millions, unless otherwise specified	6 Months Ended	0 Months Ended
	Jun. 30, 2014	Jul. 01, 2014 Subsequent Event First Phase	Jul. 01, 2014 Subsequent Event Marketing Terminals First Phase terminals	Jul. 01, 2014 Subsequent Event Storage Facility First Phase terminals
Significant Acquisitions and Disposals [Line Items]
Transaction date	Jun. 23, 2014
Purchase price	$ 270	$ 241
Date of acquisition		Jul. 01, 2014
Number Of Assets			3	1
Cash payment		214
Equity fair value		$ 27