Tesoro Logistics LP Transactions to Purchase Terminalling and Pipeline Assets (Details) (USD $)	3 Months Ended	9 Months Ended			9 Months Ended	0 Months Ended					0 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Jun. 25, 2014	Sep. 30, 2014 West Coast Logistics Assets	Jul. 01, 2014 First Phase West Coast Logistics Assets	Sep. 30, 2014 Second Phase West Coast Logistics Assets	Jul. 01, 2014 Marketing Terminals First Phase West Coast Logistics Assets terminals	Jul. 01, 2014 Storage Facility First Phase West Coast Logistics Assets terminals	Sep. 30, 2014 Refined Products Pipeline Second Phase West Coast Logistics Assets pipelines	Aug. 22, 2014 Limited Partner	Aug. 22, 2014 5.875% Senior Notes Due 2020	Sep. 30, 2014 5.875% Senior Notes Due 2020	Aug. 22, 2014 5.875% Senior Notes Due 2020
Significant Acquisitions and Disposals [Line Items]
Purchase price					$ 270,000,000	$ 241,000,000
Date of acquisition						Jul. 01, 2014	Sep. 30, 2014
Number Of Assets								3	1	1
Cash payment						214,000,000	29,000,000
Equity fair value						27,000,000
Public offering, common units											2,100,000
Net proceeds from the issuance of TLLP Common units		156,000,000	392,000,000								142,000,000
Debt instrument, aggregate principal													250,000,000	130,000,000
Debt instrument interest rate														5.875%
Debt Instrument, Maturity Date												Oct. 01, 2020
Debt redemption charges	(10,000,000)	(41,000,000)	0										10,000,000
Debt Instrument, premium paid														8,000,000
Common Units Aggregate Value, for continuous issuance				200,000,000
Units issued under the ATM Program	193,900
Proceeds from sale of units issued under the ATM Program	$ 14,000,000