Andeavor Logistics (ANDX) 10-Q 8 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	4-May-15
Entity Registrant Name	TESORO LOGISTICS LP
Entity Central Index Key	1507615
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Common
Entity Common Stock, Units Outstanding		80,605,673
General Partner
Entity Common Stock, Units Outstanding		1,631,448

Condensed_Statements_of_Combin

Condensed Statements of Combined Consolidated Operations (Unaudited) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
REVENUES
Affiliate	$148	[1]	$111	[1],[2]
Third-party	115		16	[2]
Total Revenues	263		127	[2]
COSTS AND EXPENSES
Operating and maintenance expenses	94		52	[2]
Imbalance settlement gains and reimbursements from Tesoro	-8	[3]	-7	[2],[3]
General and administrative expenses	25		10	[2]
Depreciation and amortization expenses	44		16	[2]
Gain on asset disposals and impairments	0		-4	[2]
Total Costs and Expenses	155		67	[2]
OPERATING INCOME	108		60	[2]
Interest and financing costs, net	-37		-18	[2]
Equity in earnings of unconsolidated affiliates	3		0
NET INCOME	74		42	[2]
Loss attributable to Predecessors	0		1	[2]
Net income attributable to noncontrolling interest	-10		0
Net income attributable to partners	64		43	[2]
General partner's interest in net income, including incentive distribution rights	-14		-7	[2]
Limited partners' interest in net income	50		36	[2]
Net income per limited partner unit:
Common - basic and diluted	$0.63		$0.64
Subordinated - basic and diluted	$0		$0.64
Weighted average limited partner units outstanding:
Common units - basic	80,250,208		39,186,006
Common units - diluted	80,281,988		39,284,388
Subordinated units - basic and diluted	0	[4]	15,254,890	[4]
Cash distributions paid per unit	$0.67		$0.56
Green River Processing, LLC
REVENUES
Affiliate	11		7
Third-party	15		32
Total Revenues	26		39
COSTS AND EXPENSES
Processing expense	4		10
Transportation and fractionation costs	8		9
General and administrative expenses	2		4
Depreciation and amortization expenses	2		2
Total Costs and Expenses	16		25
NET INCOME	$10		$14
[1]	Tesoro accounted for 56% and 88% of our total revenues for the three months ended March 31, 2015 and 2014, respectively.
[2]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[3]	Includes imbalance settlement gains of $2 million for both the three months ended March 31, 2015 and 2014. Also includes reimbursements primarily related to pressure testing and repairs and maintenance costs pursuant to the Amended Omnibus Agreement of $6 million and $5 million for the three months ended March 31, 2015 and 2014, respectively.
[4]	On May 16, 2014, the subordinated units were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. Distributions and the Partnership’s net income were allocated to the subordinated units through May 15, 2014.

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$16	$19	[1]
Receivables, net
Trade	125	122	[1]
Affiliate	76	69	[1]
Other	16	18	[1]
Prepayments and other	4	7	[1]
Total Current Assets	237	235	[1]
NET PROPERTY, PLANT AND EQUIPMENT	3,335	3,306	[1]
INTANGIBLES	966	973	[1]
GOODWILL	168	164	[1]
INVESTMENT IN UNCONSOLIDATED AFFILIATES	59	57	[1]
OTHER NONCURRENT ASSETS	31	30	[1]
Total Assets	4,796	4,765	[1]
Accounts payable
Trade	112	126	[1]
Affiliate	68	53	[1]
Accrued interest and financing costs	62	28	[1]
Other current liabilities	57	79	[1]
Total Current Liabilities	299	286	[1]
OTHER NONCURRENT LIABILITIES	62	45	[1]
DEBT, NET OF UNAMORTIZED ISSUANCE COSTS	2,520	2,544	[1]
COMMITMENTS AND CONTINGENCIES
EQUITY
Common unitholders; 80,605,673 units issued and outstanding (80,125,930 in 2014)	1,500	1,474
General partner; 1,631,448 units issued and outstanding (1,631,448 in 2014)	-21	-19
Noncontrolling interest	436	435	[1]
Owners' net investment	1,479	1,455	[1]
Total Equity	1,915	1,890
Total Liabilities and Equity	4,796	4,765	[1]
Green River Processing, LLC
CURRENT ASSETS
Cash and cash equivalents	2	6
Receivables, net
Trade	12	10
Affiliate	16	11
Total Current Assets	30	27
NET PROPERTY, PLANT AND EQUIPMENT	276	278
Total Assets	306	305
Accounts payable
Trade	7	10
Affiliate	15	10
Total Current Liabilities	22	20
Asset retirement obligation	5	5
COMMITMENTS AND CONTINGENCIES
EQUITY
Owners' net investment	279	280
Total Equity	279	280
Total Liabilities and Equity	$306	$305
[1]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited), (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
EQUITY
Common units issued (units)	80,605,673	80,125,930
General partner units issued (units)	1,631,448	1,631,448
Common units outstanding (units)	80,605,673	80,125,930
General partner units outstanding (units)	1,631,448	1,631,448
Cash and cash equivalents	$16	$19	[1]
NET PROPERTY, PLANT AND EQUIPMENT	3,335	3,306	[1]
QEPM
EQUITY
Cash and cash equivalents	8	15
NET PROPERTY, PLANT AND EQUIPMENT	$470	$476
[1]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.

Condensed_Statements_of_Combin1

Condensed Statements of Combined Consolidated Cash Flows (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$74		$42	[1]
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization expenses	44		16	[1]
Amortization of debt issuance costs	2		1	[1]
Unit-based compensation expense	1		0	[1]
Gain on asset disposals and impairments	0		-4	[1]
Earnings from unconsolidated affiliates in excess of distributions	-1		0	[1]
Changes in current assets and current liabilities:
Receivables	-8		-8	[1]
Other current assets	3		0	[1]
Current liabilities	20		22	[1]
Changes in non-current assets and liabilities	17		0	[1]
Net cash from operating activities	152		69	[1]
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	-82		-25	[1]
Proceeds from sale of assets	0		10	[1]
Net cash used in investing activities	-82		-15	[1]
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of units, net of issuance costs	24		0	[1]
Quarterly distributions to unitholders	-54		-31	[1]
Quarterly distributions to general partner	-16		-5	[1]
Distributions to noncontrolling interest	-9		0	[1]
Borrowings under revolving credit agreement	99		0	[1]
Repayments under revolving credit agreement	-124		0	[1]
Financing costs	0		-1	[1]
Capital contributions by affiliate	7		1	[1]
Sponsor contribution of equity to the Predecessor	0		2	[1]
Net cash used in financing activities	-73		-34	[1]
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-3		20	[1]
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	19	[2]	23	[1]
CASH AND CASH EQUIVALENTS, END OF PERIOD	16		43	[1]
SUPPLEMENTAL CASH FLOW DISCLOSURE OF NON-CASH ACTIVITIES
Capital expenditures included in accounts payable at period end	46		13	[1]
Green River Processing, LLC
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	10		14
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization expenses	2		2
Changes in current assets and current liabilities:
Accounts receivable	-7		-20
Accounts payable and accrued expenses	3		8
Changes in non-current assets and liabilities	0		-4
Net cash from operating activities	8		0
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	-1		-1
Net cash used in investing activities	-1		-1
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Capital contributions by affiliate	6		1
Distributions to owners	-17		0
Net cash used in financing activities	-11		1
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-4		0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	6		0
CASH AND CASH EQUIVALENTS, END OF PERIOD	2		0
SUPPLEMENTAL CASH FLOW DISCLOSURE OF NON-CASH ACTIVITIES
Capital expenditures included in accounts payable at period end	$1		$0
[1]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[2]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.

Organization_and_Basis_of_Pres

Organization and Basis of Presentation (Notes)	3 Months Ended
	Mar. 31, 2015
Organization and Basis of Presentation	ORGANIZATION AND BASIS OF PRESENTATION
	Organization
	Tesoro Logistics LP (“TLLP” or the “Partnership”) is a fee-based, growth-oriented Delaware limited partnership formed in December 2010 by Tesoro Corporation and its wholly-owned subsidiary, Tesoro Logistics GP, LLC (“TLGP”), our general partner, to own, operate, develop and acquire logistics assets. Unless the context otherwise requires, references in this report to “we,” “us,” “our,” or “ours” refer to Tesoro Logistics LP, one or more of its consolidated subsidiaries, or all of them taken as a whole. The words “we,” “us,” “our,” or “ours” generally include our 57.8% interest in QEP Midstream Partners, LP (“QEPM”), a publicly traded limited partnership, and its subsidiaries as consolidated subsidiaries of TLLP with certain exceptions where there are transactions or obligations between QEPM and TLLP or its other subsidiaries. Unless the context otherwise requires, references in this report to “Tesoro” or our “Sponsor” refer collectively to Tesoro Corporation and any of its subsidiaries, other than TLLP, its subsidiaries and its general partner.
	In 2014, we entered into transactions with Tesoro and TLGP, pursuant to which TLLP acquired from Tesoro three truck terminals, ten storage tanks, two rail loading and unloading facilities and a refined products pipeline (the “West Coast Logistics Assets”) effective July 1, 2014 for the terminals, storage tanks and rail facilities and effective September 30, 2014 for the refined products pipeline (collectively referred to as the “West Coast Logistics Assets Acquisition”).
	On December 2, 2014, the Partnership acquired all of the limited liability company interests of QEP Field Services, LLC (“QEPFS”) for an aggregate purchase price of approximately $2.5 billion in cash (the “Rockies Natural Gas Business Acquisition”). See Note 2 for additional information regarding the Rockies Natural Gas Business Acquisition.
	Subsequent Event
	On April 6, 2015, TLLP entered into an Agreement and Plan of Merger (the “Merger Agreement”) with TLGP, QEPFS, TLLP Merger Sub LLC (“Merger Sub”), QEPM, and QEP Midstream Partners GP, LLC (“QEPM GP”). Subject to the satisfaction or waiver of certain conditions in the Merger Agreement, upon the later of the filing with the Secretary of State of the State of Delaware of a certificate of merger or the later date and time set forth in such certificate, Merger Sub will merge with and into QEPM, with QEPM surviving the merger as a wholly owned subsidiary of TLLP (the “Merger”). Following the Merger, QEPM GP will remain the general partner of QEPM, and all outstanding common units representing limited partnership interests in QEPM (the “QEPM Common Units”) other than QEPM Common Units held by QEPFS will be converted into the right to receive 0.3088 common units representing limited partnership interests in TLLP (the “TLLP Common Units”). We expect to issue approximately 7.1 million TLLP Common Units upon consummation of the Merger. No fractional TLLP Common Units will be issued in the Merger, and holders of QEPM Common Units other than QEPFS will instead receive cash in lieu of fractional TLLP Common Units, if any. Cash in lieu of fractional units will be the only cash component of the Merger. The Merger is expected to close in 2015 and is subject to customary closing conditions, including approval by the unaffiliated QEPM unitholders.
	Principles of Combination and Consolidation and Basis of Presentation
	The West Coast Logistics Assets Acquisition was a transfer between entities under common control. As an entity under common control with Tesoro, we record the assets that we acquire from Tesoro on our consolidated balance sheet at Tesoro’s historical basis instead of fair value. Transfers of businesses between entities under common control are accounted for as if the transfer occurred at the beginning of the period, and prior periods are retrospectively adjusted to furnish comparative information. Accordingly, the accompanying financial statements and related notes of TLLP have been retrospectively adjusted to include the historical results of the assets acquired in the West Coast Logistics Assets Acquisition for all periods presented. We refer to the historical results of the West Coast Logistics Assets prior to their respective acquisition dates as our “Predecessor.”
	The accompanying financial statements and related notes present the results of operations and cash flows of our Predecessor at historical cost. The financial statements of our Predecessor have been prepared from the separate records maintained by Tesoro and may not necessarily be indicative of the conditions that would have existed or the results of operations if our Predecessor had been operated as an unaffiliated entity. Our Predecessor did not record revenue for transactions with Tesoro in the Terminalling and Transportation segment, with the exception of regulatory tariffs charged to Tesoro on the refined products pipeline included in the West Coast Logistics Assets Acquisition.
	The interim combined consolidated financial statements and notes thereto have been prepared by management without audit according to the rules and regulations of the Securities and Exchange Commission (“SEC”) and reflect all adjustments that, in the opinion of management, are necessary for a fair presentation of results for the periods presented. Such adjustments are of a normal recurring nature, unless otherwise disclosed.
	Certain information and notes normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations. However, management believes that the disclosures presented herein are adequate to present the information fairly. The accompanying interim condensed combined consolidated financial statements and notes should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2014.
	Our consolidated financial statements include QEPM, a variable interest entity. As the general partner of QEPM, we have the sole ability to direct the activities of QEPM that most significantly impact its economic performance. We are also considered to be the primary beneficiary for accounting purposes. In the event QEPM incurs a loss, our operating results will reflect QEPM’s loss, net of intercompany eliminations.
	We prepare our condensed combined consolidated financial statements in conformity with U.S. GAAP, which requires management to make estimates and assumptions that affect the amounts of assets and liabilities and revenues and expenses reported as of and during the periods presented. We review our estimates on an ongoing basis using currently available information. Changes in facts and circumstances may result in revised estimates, and actual results could differ from those estimates. The results of operations of the Partnership, or our Predecessor, for any interim period are not necessarily indicative of results for the full year.
	We believe the carrying value of our cash and cash equivalents, receivables, accounts payable and certain accrued liabilities approximates fair value. Our fair value assessment incorporates a variety of considerations, including:
	•	the short term duration of the instruments (less than 2% of our trade payables and trade receivables have been outstanding for greater than 90 days); and
	•	the expected future insignificance of bad debt expense, which includes an evaluation of counterparty credit risk.
	The computation of the percentage of the short-term duration of our third-party receivables excludes amounts that are greater than 90 days related to XTO Energy Inc.’s (“XTO”) legal dispute with QEPFS. See further discussion regarding the XTO litigation in Note 7.
	The fair value of our senior notes is based on prices from recent trade activity and is categorized in level 2 of the fair value hierarchy. The borrowings under our amended revolving credit facility (the “Revolving Credit Facility”), which include a variable interest rate, approximate fair value. The carrying value of our debt was approximately $2.6 billion and the fair value of our debt was approximately $2.7 billion as of March 31, 2015. The carrying value and fair value of our debt were both approximately $2.6 billion as of December 31, 2014. These carrying and fair values of our debt do not include the unamortized issuance costs associated with our total debt.
	New Accounting Standards
	Revenue Recognition. The Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) in May 2014, providing accounting guidance for all revenue arising from contracts to provide goods or services to customers. The requirements from the new ASU are effective for interim and annual periods beginning after December 15, 2016, and early adoption is not permitted. The FASB has proposed a one-year deferral of the effective date; however, this proposal has not been finalized. The standard allows for either full retrospective adoption or modified retrospective adoption. At this time, we are evaluating the guidance to determine the method of adoption and the impact of this ASU on our financial statements and related disclosures.
	Pushdown Accounting. The SEC released a Staff Accounting Bulletin (“SAB”) in November 2014, overturning portions of the interpretive guidance regarding pushdown accounting. Effective November 18, 2014, the new bulletin aligns the existing guidance to the ASU issued by the FASB in October 2014. Under the new guidance, pushdown accounting can be applied in the separate financial statements of the acquired entity upon completion of the acquisition or in a subsequent period. This impacts the stand-alone financial statements of the subsidiary, but does not alter the existing reporting requirements for the parent company to record the acquired assets, liabilities, and non-controlling interests in consolidated financial statements. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period. If pushdown accounting is applied, that election is irrevocable. The SEC responded by rescinding its guidance on pushdown accounting, which had required registrants to apply pushdown accounting in certain circumstances. With regard to the Rockies Natural Gas Business Acquisition, we did not elect to apply pushdown accounting to certain acquired entities.
	Treatment of Predecessor in EPU calculation. The Emerging Issues Task Force (“EITF”) reached a final consensus on Issue 14-A affirming their stance to require a master limited partnership to allocate earnings or losses of transferred net assets for periods prior to asset purchases from Tesoro entirely to the general partner when calculating earnings per unit (“EPU”). The final consensus is effective for interim and annual periods beginning after December 15, 2015 and early adoption is permitted. We have elected to adopt this guidance beginning in the first quarter of 2015. Adoption of the final consensus did not impact the disclosed amounts of earnings per unit attributable to limited partners; however, the allocation of earnings presented in our EPU disclosure for the three months ended March 31, 2014 has been modified to conform to the requirements of the final consensus. There were no asset purchases from Tesoro during the three months ended March 31, 2015.
	Debt Issuance Costs. In April 2015, the FASB issued ASU 2015-03 which will simplify the presentation of debt issuance costs. Under the new ASU, debt issuance costs related to a recognized debt liability will be presented in the balance sheet as a direct deduction from the carrying amount of the related debt liability. As a result, our balance sheet will reflect a reclassification of unamortized debt issuance costs from other noncurrent assets to debt. This ASU is effective for interim and annual periods beginning after December 15, 2015, and early adoption is permitted. We have adopted this standard effective as of March 31, 2015 and applied the changes retrospectively to prior periods presented. Adoption of this standard has resulted in the reclassification of $49 million from other noncurrent assets to debt on the balance sheet at December 31, 2014. Unamortized debt issuance costs of $47 million are recorded as a reduction to debt on the balance sheet as March 31, 2015.
Green River Processing, LLC
Organization and Basis of Presentation	ORGANIZATION AND BASIS OF PRESENTATION
	Organization
	Green River Processing consists of the assets and operations of the Blacks Fork gas processing complex and the Emigrant Trail gas plant (the “Assets”), both of which are located in southwest Wyoming. Processing capacity of the Assets include cryogenic and Joule-Thomson capacity, as well as natural gas liquids (“NGLs”) fractionation capacity at the Blacks Fork complex.
	Green River Processing is a Delaware limited liability company that was organized on February 6, 2014, and was initially wholly-owned by QEP Field Services Company (“QEPFSC”), which is a wholly-owned subsidiary of QEP Resources, Inc. (“QEP Resources”). Prior to formation of Green River Processing, the Assets were owned by Green River Processing Operations (“Green River Processing Operations”), which was also wholly-owned by QEPFSC. On July 1, 2014, QEPFSC conveyed the Assets to Green River Processing (the “Contribution”) in connection with its sale of 40% of the membership interests in Green River Processing to QEP Midstream Partners Operating, LLC, which is wholly-owned by QEP Midstream Partners, LP (“QEPM”).
	On December 2, 2014, TLLP acquired QEP Resources’ midstream business, including QEPFS, which was previously wholly-owned by QEPFSC. QEPFS owns 60% membership interest in Green River Processing and approximately 58% of general and limited partnership units of QEPM, which owns the remaining 40% membership interest of Green River Processing through QEP Midstream Partners Operating, LLC (collectively, the “Acquisition”). As such, financial results reported for the three months ended March 31, 2014 (the “2014 Quarter”) reflect results of operations under the management of QEP Resources, and have been prepared from the historical accounting records owned and maintained by QEP Resources. Further, financial information for the 2014 Quarter was carved out from QEPFSC data as separate and distinct accounts for Green River Processing Operations have not been maintained. Financial data reported for the three months ended March 31, 2015 (the “2015 Quarter”) reflect results of operations under the management of TLLP and have been prepared from records owned and maintained by TLLP.
	Basis of Presentation
	The financial statements were prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). All significant intercompany accounts and transactions have been eliminated in consolidation. Financial results reported for the 2014 Quarter have been prepared from the historical accounting records owned and maintained by QEP Resources. Further, financial information for the 2015 Quarter was carved out from QEPFSC data as separate and distinct accounts for Green River Processing Operations have not been maintained. Financial results reported for the three months ended March 31, 2015 have been prepared from records owned and maintained by TLLP.
	The preparation of the financial statements and notes in conformity with GAAP requires that management formulate estimates and assumptions that affect the amounts of assets and liabilities and revenues and expenses reported as of and during the periods presented. The Company reviews these estimates on an ongoing basis using currently available information. Changes in facts and circumstances may result in revised estimates, and actual results could differ from those estimates.
	Green River Processing Operations is a limited liability company that is classified as a partnership for income tax purposes.
	There were no assets or liabilities accounted for at fair value on a recurring basis as of March 31, 2015. Management believes the carrying value of our current assets and liabilities approximate fair value.
	QEPFS and certain of its subsidiaries, including Green River Processing, were elected guarantors of TLLP’s registered 2020 5.875% Senior Notes and 2021 6.125% Senior Notes in January 2015. The guarantees are full and unconditional and joint and several, subject to certain automatic customary releases, including sale, disposition or transfer of the capital stock or substantially all of the assets of a subsidiary guarantor, exercise of legal defeasance option or covenant defeasance option, and designation of a subsidiary guarantor as unrestricted in accordance with the applicable indenture.
	Transactions with QEP Resources and QEPFSC were considered related party for the three months ended March 31, 2014. For the three months ended March 31, 2015, transactions with QEPFS and TLLP are considered related party. See Note 2 for additional information.
	Recent Accounting Developments
	Revenue Recognition. The Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) in May 2014 providing accounting guidance for all revenue arising from contracts to provide goods or services to customers. The requirements from the new ASU are effective for interim and annual periods beginning after December 15, 2016, and early adoption is not permitted. The FASB has proposed a one-year deferral of the effective date, however this proposal has not been finalized at this time. The standard allows for either full retrospective adoption or modified retrospective adoption. At this time, we are evaluating the guidance to determine the method of adoption and the impact of this ASU on our financial statements and related disclosures.
	Pushdown Accounting. The Securities and Exchange Commission (“SEC”) released a Staff Accounting Bulletin in November 2014, overturning portions of the interpretive guidance regarding pushdown accounting. Effective November 18, 2014, the new bulletin aligns the existing guidance to the ASU issued by the FASB in October 2014. Under the new guidance, pushdown accounting can be applied in the separate financial statements of the acquired entity upon completion of the acquisition or in a subsequent period. This impacts the stand-alone financial statements of the subsidiary, but does not alter the existing reporting requirements for the parent company to record the acquired assets, liabilities, and non-controlling interests in consolidated financial statements. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period. If pushdown accounting is applied, that election is irrevocable. The SEC responded by rescinding its guidance on pushdown accounting, which had required registrants to apply pushdown accounting in certain circumstances. With regard to the Acquisition, TLLP elected not to apply pushdown accounting to Green River Processing.

Acquisitions_Notes

Acquisitions (Notes)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS
	Rockies Natural Gas Business Acquisition
	On December 2, 2014, the Partnership closed the acquisition with QEP Resources, Inc. (“QEP Resources”), in which we agreed to purchase all of the limited liability company interests of QEPFS for approximately $2.5 billion in cash. QEPFS is the direct or indirect owner of assets related to, and entities engaged in, natural gas gathering, transportation and processing in or around the Green River Basin located in Wyoming and Colorado, the Uinta Basin located in eastern Utah (collectively, the “Rockies Region”), and the Williston Basin located in North Dakota (the “Bakken Region”). QEPFS also holds an approximate 55.8% limited partner interest in QEPM and 100% of the limited liability company interests of QEPM GP, which itself holds a 2% general partner interest and all of the incentive distribution rights (“IDRs”) in QEPM. The acquired assets include natural gas and crude oil gathering and transmission pipelines within the Rockies and Bakken Regions, which are reported in our Gathering segment. Additionally, the acquired assets include four natural gas processing complexes and one fractionation facility, the operations of which are reported in our Processing segment.
	Finalization of the purchase price allocation is pending and adjustments can be made through the end of TLLP’s measurement period, which is not to exceed one year from the acquisition date. During the three months ended March 31, 2015, the original purchase price was increased by $7 million for adjustments in net working capital primarily for changes related to accounts receivable as well as a change related to goodwill. We recorded $159 million of goodwill in connection with the Rockies Natural Gas Business Acquisition, of which $17 million was included in our Gathering segment, and $142 million included in our Processing segment. Acquired intangibles other than goodwill are recorded at fair value as of the date acquired, and consist of customer relationships obtained in connection with the Rockies Natural Gas Business Acquisition. We amortize acquired intangibles with finite lives on a straight-line basis over an estimated weighted average useful life of 35 years, and we include the amortization in depreciation and amortization on our combined consolidated statements of operations. The gross carrying value of our intangibles was approximately $976 million and the accumulated amortization was approximately $10 million as of March 31, 2015. During the three months ended March 31, 2015, we incurred $7 million of amortization expense related to these intangibles.
	During the three months ended March 31, 2015, we incurred integration costs of $3 million related to the Rockies Natural Gas Business Acquisition. These costs are included in general and administrative expenses in our condensed statement of combined consolidated operations.
	The table below reflects the preliminary acquisition date purchase price allocation as of March 31, 2015 (in millions):
	Cash	$	31
	Accounts receivable	120
	Prepayments and other	7
	Property, plant and equipment	1,735
	Intangibles	976
	Goodwill	159
	Investment in unconsolidated affiliates	57
	Other noncurrent assets	23
	Accounts payable	(81		)
	Other current liabilities	(47		)
	Other noncurrent liabilities	(31		)
	Noncontrolling interest	(432		)
	Total purchase price	$	2,517
	If the Rockies Natural Gas Business Acquisition had occurred on January 1, 2014, our pro forma revenues and net income would have been $225 million and $49 million, respectively, for the three months ended March 31, 2014.
	2014 Acquisition
	On July 1, 2014, we acquired the first portion of the West Coast Logistics Assets and we acquired the second portion of the assets on September 30, 2014, upon receiving the required regulatory approval. The operations of the West Coast Logistics Assets are included in our Terminalling and Transportation segment.
	These transactions were transfers between entities under common control. See our Annual Report on Form 10-K for the year ended December 31, 2014, for additional information regarding the West Coast Logistics Assets Acquisition and the commercial agreements executed in connection with this acquisition.

RelatedParty_Transactions_Note

Related-Party Transactions (Notes)	3 Months Ended
	Mar. 31, 2015
Related-Party Transactions	RELATED-PARTY TRANSACTIONS
	Affiliate Agreements
	The Partnership has various long-term, fee-based commercial agreements with Tesoro under which we provide pipeline transportation, trucking, terminal distribution, storage and petroleum-coke handling services to Tesoro, and Tesoro commits to provide us with minimum monthly throughput volumes of crude oil and refined products. We believe the terms and conditions under these agreements, as well as our other agreements with Tesoro, are generally no less favorable to either party than those that could have been negotiated with unaffiliated parties with respect to similar services.
	We entered into the Third Amended and Restated Omnibus Agreement (the “Amended Omnibus Agreement”) and the Secondment and Logistics Services Agreement (the “Secondment Agreement”) in connection with the West Coast Logistics Assets Acquisition. We also entered into the First Amended and Restated Omnibus Agreement of QEPM (the “QEPM Omnibus Agreement”) and the Keep-Whole Commodity Fee Agreement (the “Keep-Whole Commodity Fee Agreement”) in connection with the Rockies Natural Gas Business Acquisition. See Notes 3 and 11 of our Annual Report on Form 10-K for the year ended December 31, 2014, for additional information regarding the terms and conditions of these agreements.
	On February 20, 2015, we entered into an amendment to the Amended Omnibus Agreement. The amendment, effective December 31, 2014, clarifies certain provisions regarding the responsibilities for costs incurred by TLLP in connection with pressure testing conducted on our gathering and transportation system located in the Bakken Region.
	Summary of Affiliate Transactions
	A summary of revenue and expense transactions with Tesoro, including expenses directly charged and allocated to our Predecessors, are as follows (in millions):
		Three Months Ended March 31,
		2015			2014
	Revenues (a)	$	148		$	111
	Operating and maintenance expenses	25			20
	Imbalance settlement gains and reimbursements from Tesoro (b)	8			7
	General and administrative expenses	17			7
	____________
	(a)	Tesoro accounted for 56% and 88% of our total revenues for the three months ended March 31, 2015 and 2014, respectively.
	(b)	Includes imbalance settlement gains of $2 million for both the three months ended March 31, 2015 and 2014. Also includes reimbursements primarily related to pressure testing and repairs and maintenance costs pursuant to the Amended Omnibus Agreement of $6 million and $5 million for the three months ended March 31, 2015 and 2014, respectively.
	Predecessor Transactions. Related-party transactions of our Predecessor were settled through equity. The balance in receivables and accounts payable from affiliated companies represents the amount owed from or to Tesoro related to certain affiliate transactions. Our Predecessor did not record revenue for transactions with Tesoro in the Terminalling and Transportation segment, with the exception of regulatory tariffs charged to Tesoro on the refined products pipeline included in the West Coast Logistics Assets Acquisition.
	Distributions. In accordance with our partnership agreement, the unitholders of our common and general partner interests are entitled to receive quarterly distributions of available cash. In connection with the Rockies Natural Gas Business Acquisition, our general partner has waived its right to $10 million of general partner distributions with respect to IDRs during 2015 (pro rata on a quarterly basis). For the three months ended March 31, 2015 our general partner waived $2.5 million of general partner distributions with respect to IDRs. During the three months ended March 31, 2015, we paid quarterly cash distributions of $35 million to Tesoro and TLGP, including IDRs. On April 22, 2015, we declared a quarterly cash distribution of $0.6950 per unit, which will be paid on May 15, 2015. The distribution will include payment of $33 million to Tesoro and TLGP, including IDRs.
Green River Processing, LLC
Related-Party Transactions	RELATED PARTY TRANSACTIONS
	Transactions with QEP Resources and QEPFSC were considered related party for the period prior to the Acquisition, including the three months ended March 31, 2014. Subsequent to the Acquisition, including the three months ended March 31, 2015, transactions between QEPFS and TLLP are considered related party.
	The following table summarizes the other affiliate revenue (expense) transactions with QEP Resources and QEPFSC (“QEP Entities”) and Tesoro, TRMC, Tesoro Logistics GP, LLC (“TLGP”), TLLP or any of TLLP’s subsidiaries (“Tesoro Entities”):
			Tesoro Entities			QEP Entities
			Three Months Ended March 31,
			2015			2014
			(in millions)
	Revenue from affiliate		$	11		$	7
	General and administrative		2			4
	Centralized Cash Management
	Operation of the Assets were funded by QEP Resources and managed under QEP Resources’ centralized cash management program prior to the Acquisition and are currently under TLLP’s cash management program. Sales and purchases related to third-party transactions were settled in cash but were received or paid by QEP Resources within the centralized cash management system for the three months ended March 31, 2014, or by TLLP for the three months ended March 31, 2015.
	Allocation of Costs
	The employees supporting Green River Processing’s operations were employees of QEPFSC and QEP Resources for the three months ended March 31, 2014 or TLGP, the general partner of TLLP, for the three months ended March 31, 2015. The financial statements of Green River Processing include direct charges for operations and support of our assets and costs allocated by QEP Resources, TLLP or TLGP. These allocated costs are reimbursed and relate to various business and corporate services and compensation-related costs.
	Keep-Whole Commodity Fee Agreement
	Effective December 2, 2014, following the completion of the Acquisition, Green River Processing entered into a five-year agreement with Tesoro Refining & Marketing Company LLC (“TRMC”), a wholly-owned subsidiary of Tesoro Corporation, which transfers Green River Processing’s commodity risk exposure associated with keep-whole processing agreements to TRMC (the “Keep-Whole Commodity Agreement”). Under a keep-whole agreement, a producer transfers title to the NGLs produced during gas processing, and the processor, in exchange, delivers to the producer natural gas with a British thermal unit (“BTU”) content equivalent to the NGLs removed. The operating margin for these contracts is determined by the spread between NGL sales prices and the price paid to purchase the replacement natural gas (“Shrink Gas”). Under the Keep-Whole Commodity Agreement with TRMC, TRMC pays Green River Processing a fee to process NGLs related to keep-whole agreements and delivers Shrink Gas to the producers on behalf of Green River Processing. Green River Processing pays TRMC a marketing fee in exchange for assuming the commodity risk.
	Terms and pricing under this agreement are revised each year. The Keep-Whole Commodity Agreement minimizes the impact of commodity price movement during the annual period subsequent to renegotiation of terms and pricing each year. However, the annual fee we charge TRMC could be impacted as a result of any changes in the spread between NGL sales prices and the price of natural gas.
	Annual General & Administrative Services Fee
	As part of the Contribution, Green River Processing entered into the Limited Liability Company Agreement of Green River Processing, LLC (the “Operating Agreement”), which provided that Green River Processing pay QEPFSC an annual general and administrative services fee of $7 million. The rights and provisions of the Operating Agreement were transferred from QEPFSC to QEPFS in connection with the Acquisition, and there were no changes to the annual fee.
	Gas Conditioning Agreement
	The Blacks Fork processing complex is party to a gas conditioning agreement (the “Gas Conditioning Agreement”) with QEPM whereby QEPM has agreed to make available to TLLP at the Blacks Fork processing complex natural gas volumes that it has gathered under certain “life-of-reserves” and long-term, natural gas gathering agreements with several producer customers. Pursuant to the terms of the Gas Conditioning Agreement, the Blacks Fork processing complex has been assigned QEPM’s conditioning and keep-whole processing rights detailed in the underlying gathering agreements.

Net_Income_Per_Unit_Notes

Net Income Per Unit (Notes)	3 Months Ended
	Mar. 31, 2015
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax [Abstract]
Net Income Per Unit	NET INCOME PER UNIT
	We use the two-class method when calculating the net income per unit applicable to limited partners, because we have more than one participating security. At March 31, 2015, our participating securities consist of common units, general partner units and IDRs. Net income earned by the Partnership is allocated between the limited and general partners in accordance with our partnership agreement. We base our calculation of net income per unit on the weighted average number of common and subordinated limited partner units outstanding during the period.
	Effective May 16, 2014, all of the outstanding subordinated units were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. The conversion did not impact the amount of the cash distribution paid or the total number of the Partnership’s outstanding units representing limited partner interests.
	Diluted net income per unit includes the effects of potentially dilutive units on our common units, which consist of unvested service and performance phantom units. Basic and diluted net income per unit applicable to subordinated limited partners was historically the same, as there were no potentially dilutive subordinated units outstanding. Distributions less than or greater than earnings are allocated in accordance with our partnership agreement.
	The calculation of net income per unit is as follows (in millions, except unit and per unit amounts):
		Three Months Ended March 31,
		2015			2014
	Net income	$	74		$	42
	Net income attributable to noncontrolling interest	(10		)	—
	Net income, excluding noncontrolling interest (a)	64			42
	General partner’s distributions (including IDRs) (b)	(14		)	(7		)
	Limited partners’ distributions on common units	(56		)	(23		)
	Limited partners’ distributions on subordinated units (c)	—			(9		)
	Distributions less (greater) than earnings	$	(6	)	$	3
	General partner’s earnings:
	Distributions (including IDRs) (b)	$	14		$	7
	Allocation of distributions less (greater) than earnings (a)	—			1
	Total general partner’s earnings	$	14		$	8
	Limited partners’ earnings on common units:
	Distributions	$	56		$	23
	Allocation of distributions less (greater) than earnings	(6		)	1
	Total limited partners’ earnings on common units	$	50		$	24
	Limited partners’ earnings on subordinated units (c):
	Distributions	$	—		$	9
	Allocation of distributions less (greater) than earnings	—			1
	Total limited partners’ earnings on subordinated units	$	—		$	10
	Weighted average limited partner units outstanding:
	Common units - basic	80,250,208			39,186,006
	Common unit equivalents	31,780			98,382
	Common units - diluted	80,281,988			39,284,388
	Subordinated units - basic and diluted (c)	—			15,254,890
	Net income per limited partner unit:
	Common - basic and diluted	$	0.63		$	0.64
	Subordinated - basic and diluted	$	—		$	0.64
	____________
	(a)	In April 2015, the FASB ratified an EITF consensus on Issue 14-A concerning historical earnings per unit for master limited partnership drop down transactions. We have revised the historical allocation of general partner earnings to include the Predecessor loss TLLP incurred during the three months ended March 31, 2014. See Note 1 for additional information on the new guidance.
	(b)	General partner’s distributions (including IDRs) consist of an approximate 2% general partner interest and IDRs, which entitle the general partner to receive increasing percentages, up to 50%, of quarterly distributions in excess of $0.388125 per unit per quarter. The amount above reflects earnings distributed to our general partner (including IDRs) net of $2.5 million in IDRs waived by TLGP in connection with the Rockies Natural Gas Business Acquisition. See Note 12 of our Annual Report on Form 10-K for the year ended December 31, 2014, for further discussion related to IDRs.
	(c)	On May 16, 2014, the subordinated units were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. Distributions and the Partnership’s net income were allocated to the subordinated units through May 15, 2014.

Property_Plant_and_Equipment_N

Property, Plant and Equipment (Notes)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment, at cost, is as follows (in millions):
		March 31, 2015			December 31, 2014
	Gathering	$	1,558		$	1,507
	Processing	541			539
	Terminalling and Transportation	1,492			1,478
	Other	26			27
	Gross Property, Plant and Equipment	3,617			3,551
	Accumulated depreciation	(282		)	(245		)
	Net Property, Plant and Equipment	$	3,335		$	3,306
Green River Processing, LLC
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT
	A summary of the historical cost of Green River Processing’s property, plant and equipment is as follows:
		March 31, 2015			December 31, 2014
		(in millions)
	Total property, plant and equipment	$	317		$	317
	Accumulated depreciation	(41		)	(39		)
	Total net property, plant and equipment	$	276		$	278

Debt_Notes

Debt (Notes)	3 Months Ended
	Mar. 31, 2015
Long-term Debt, Unclassified [Abstract]
Debt	DEBT
	Our debt balance at March 31, 2015 and December 31, 2014 was as follows (in millions):
		March 31, 2015				December 31, 2014
	Total debt	$	2,563			$	2,588
	Unamortized issuance costs (a)	(43		)		(44		)
	Current maturities	—				—
	Debt, net of current maturities and unamortized issuance costs	$	2,520			$	2,544
	____________
	(a) Includes unamortized premium of $4 million and $5 million as of March 31, 2015 and December 31, 2014, respectively.
	Revolving Credit Facility
	As of March 31, 2015, our Revolving Credit Facility provided for total loan availability of $900 million, and we are allowed to request that the loan availability be increased up to an aggregate of $1.5 billion, subject to receiving increased commitments from the lenders. Our Revolving Credit Facility is non-recourse to Tesoro, except for TLGP, and is guaranteed by all of our consolidated subsidiaries, with the exception of Rendezvous Gas Services L.L.C., and secured by substantially all of our assets. Borrowings are available under the Revolving Credit Facility up to the total loan availability of the facility. We had $235 million of borrowings outstanding under the Revolving Credit Facility, resulting in a total unused loan availability of $665 million or 74% of the borrowing capacity as of March 31, 2015. The weighted average interest rate for borrowings under our Revolving Credit Facility was 2.67% at March 31, 2015. The Revolving Credit Facility is scheduled to mature on December 2, 2019.
	The Revolving Credit Facility was subject to the following expenses and fees as of March 31, 2015:
	Credit Facility		30 day Eurodollar (LIBOR) Rate		Eurodollar Margin		Base Rate		Base Rate Margin	Commitment Fee
										(unused portion)
	Revolving Credit Facility (b)		0.18%		2.50%		3.25%		1.50%	0.50%
	____________
	(b) We have the option to elect if the borrowings will bear interest at either a base rate plus the base rate margin, or a Eurodollar rate, for the applicable period, plus the Eurodollar margin at the time of the borrowing. The applicable margin varies based upon a certain leverage ratio, as defined by the Revolving Credit Facility. We also incur commitment fees for the unused portion of the Revolving Credit Facility at an annual rate. Letters of credit outstanding under the Revolving Credit Facility incur fees at the Eurodollar margin rate.

Commitments_and_Contingencies_

Commitments and Contingencies (Notes)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	Tesoro Indemnification
	Under the Amended Omnibus Agreement, Tesoro indemnifies us for certain matters, including environmental, title and tax matters associated with the ownership of our assets at or before the closing of the TLLP initial public offering (“Initial Offering”) and subsequent acquisitions from Tesoro, excluding certain Los Angeles assets acquired from Tesoro in 2013. Under the Carson Assets Indemnity Agreement (the “Carson Assets Indemnity Agreement”), Tesoro retained responsibility for remediation of known environmental liabilities due to the use or operation of certain Los Angeles assets prior to the acquisition dates, and has indemnified the Partnership for any losses incurred by the Partnership arising out of those remediation obligations. See Note 11 of our Annual Report on Form 10-K for the year ended December 31, 2014, for additional information regarding the terms and conditions of the Amended Omnibus Agreement and the Carson Assets Indemnity Agreement.
	Contingencies
	In the ordinary course of business, we may become party to lawsuits, administrative proceedings and governmental investigations, including environmental, regulatory and other matters. The outcome of these matters cannot always be predicted accurately, but TLLP will accrue liabilities for these matters if the amount is probable and can be reasonably estimated. Contingencies arising after the closing of the Initial Offering from conditions existing before the Initial Offering, and the subsequent Acquisitions from Tesoro that have been identified after the closing of each transaction, will be recorded in accordance with the indemnification terms set forth in the Amended Omnibus Agreement and the Carson Assets Indemnity Agreement. Any contingencies arising from events after the Initial Offering, and the subsequent acquisitions from Tesoro, will be the responsibility of TLLP.
	Environmental Liabilities
	We are subject to federal, state and local laws and regulations governing environmental quality and pollution control. These laws and regulations require us to remove or remedy the effect of the disposal or release of specified substances at current and former operating sites. We have accrued liabilities for these expenses and believe these accruals are adequate based on current information and projections that can be reasonably estimated. Our environmental liabilities are estimates using internal and third-party assessments and available information to date. It is possible that these estimates will change as more information becomes available. Our accruals for these environmental expenditures totaled $28 million and $32 million at March 31, 2015 and December 31, 2014, respectively. Expenditures of $4 million during the three months ended March 31, 2015 were related to the release of crude oil in Tioga, North Dakota.
	Tioga, North Dakota Crude Oil Pipeline Release. In September 2013, the Partnership responded to the release of crude oil in a rural field northeast of Tioga, North Dakota (the “Crude Oil Pipeline Release”). The environmental liabilities related to the Crude Oil Pipeline Release include amounts estimated for remediation activities that will be conducted to restore the site for agricultural use. We had insurance recovery receivables of $16 million and $18 million related to the Crude Oil Pipeline Release at March 31, 2015 and December 31, 2014, respectively. These receivables are pursuant to a pollution liability insurance policy, which is subject to a $1 million deductible and a $25 million loss limit. The estimated remediation costs exceeded our policy loss limit by $17 million as of March 31, 2015 and December 31, 2014. Through March 31, 2015, we have received insurance proceeds of $9 million in reimbursements of costs incurred.
	Costs to comply with a safety order related to the Crude Oil Pipeline Release issued by the Pipeline and Hazardous Materials Safety Administration of the U.S. Department of Transportation (“PHMSA”) are not expected to have a material adverse effect on our liquidity, financial position or results of operations.
	Chevron Diesel Pipeline Release. On March 18, 2013, Chevron Pipe Line Company and Northwest Terminalling Company (collectively, “Chevron”) detected and responded to the release of diesel fuel (the “Diesel Pipeline Release”) that occurred near Willard, Utah on the northwest products system (the “Northwest Products System”). As a result of this release, a Corrective Action Order (the “CAO”) was issued on March 22, 2013 by PHMSA. The Partnership assumed responsibility for performing additional testing and associated pipeline repairs on the pipeline pursuant to the CAO upon closing the Northwest Products System acquisition. On March 6, 2015, PHMSA issued a closure letter indicating that we have complied with all the terms of the CAO and that no further action is required. In addition, on April 11, 2013, the Department of Environmental Quality, Division of Water Quality, of the state of Utah issued a notice of violation and compliance order. In accordance with the sale and purchase agreements related to the Northwest Products System acquisition, as amended, Chevron retains financial and operational responsibility to remediate the site of the Diesel Pipeline Release through mid-2015, in addition to paying any monetary fines and penalties assessed by any government authority arising from this incident. In connection with the Northwest Products System acquisition, our condensed combined consolidated balance sheet included $6 million in accrued environmental liabilities at both March 31, 2015 and December 31, 2014.
	Legal
	Questar Gas Company v. QEP Field Services Company. QEPFS’ former affiliate, Questar Gas Company (“QGC”) and its affiliate Wexpro, filed a complaint on May 1, 2012, asserting claims for breach of contract, breach of implied covenant of good faith and fair dealing, and an accounting and declaratory judgment related to a 1993 gathering agreement (the “1993 Agreement”) executed when the parties were affiliates. TLLP has agreed to indemnify QEP Field Services Company (“QEPFSC”) for this claim under the acquisition agreement for QEPFS. Under the 1993 Agreement, certain of QEPFS’ systems provide gathering services to QGC charging an annual gathering rate which is based on the cost of service calculation. QGC is disputing the annual calculation of the gathering rate, which has been calculated in the same manner since 1998, without objection by QGC. At the closing of the QEPM initial public offering, the assets and agreement discussed above were assigned to QEPM. QGC amended its complaint to add QEPM as a defendant in the litigation. QEPM was indemnified by the Partnership upon closing of the Rockies Natural Gas Business Acquisition for costs, expenses and other losses incurred by QEPM in connection with the QGC dispute, subject to certain limitations, as set forth in the QEPM Omnibus Agreement. QGC has netted $15 million of disputed amounts from its monthly payments of the gathering fees to QEPFS and has continued to net such amounts from its monthly payment to QEPM. In December 2014, the trial court granted a partial summary judgment in favor of QGC on the issues of the appropriate methodology for certain of the cost of service calculations. As a result of the summary judgment, the Partnership assumed a $21 million liability for estimated damages in excess of the amount QGC has netted for disputed amounts. Issues regarding other calculations, the amount of damages and certain counterclaims in the litigation remain open pending a trial on the merits. We believe the outcome of this matter will not have a material impact on our liquidity, financial position, or results of operations.
	XTO Energy Inc. v. QEP Field Services Company. XTO Energy Inc. XTO filed a complaint on January 30, 2014, asserting claims for breach of contract, breach of implied covenant of good faith and fair dealing, unjust enrichment and an accounting related to a 2010 gas processing agreement (the “XTO Agreement”). QEPFS processes XTO’s natural gas on a firm basis under the XTO Agreement. The XTO Agreement requires QEPFS to transport, fractionate and market XTO’s natural gas liquids derived from XTO’s processed gas. XTO is seeking monetary damages related to QEPFS allocation of charges related to XTO’s share of natural gas liquid transportation, fractionation and marketing costs associated with shortfalls in contractual firm processing volumes. While we cannot currently estimate the final amount or timing of the resolution of this matter, we believe the outcome will not have a material impact on our liquidity, financial position, or results of operations.
	Other than described above, we did not have any material outstanding lawsuits, administrative proceedings or governmental investigations as of March 31, 2015.
Green River Processing, LLC
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	Commitments
	Green River Processing has an annual commitment under its Operating Agreement with QEPFS. See Note 2 for additional information.
	Contingencies
	In the ordinary course of business, we may become party to lawsuits, administrative proceedings and governmental investigations, including environmental, regulatory and other matters. The outcome of these matters cannot always be predicted accurately, but Green River Processing will accrue liabilities for these matters if the amount is probable and can be reasonably estimated.
	Legal
	The Company does not have any material outstanding lawsuits, administrative proceedings or governmental investigations.

Equity_Notes

Equity (Notes)	3 Months Ended
	Mar. 31, 2015
Equity	EQUITY
	We had 52,423,925 common public units outstanding as of March 31, 2015. Additionally, Tesoro owned 28,181,748 of our common units and 1,631,448 of our general partner units (the 2% general partner interest) as of March 31, 2015, which together constitutes a 36% ownership interest in us.
	ATM Program. On June 25, 2014, we filed a prospectus supplement to our shelf registration statement filed with the Securities and Exchange Commission in 2012, authorizing the continuous issuance of up to an aggregate of $200 million of common units, in amounts, at prices and on terms to be determined by market conditions and other factors at the time of our offerings (such continuous offering program, or at-the-market program, referred to as our “ATM Program”). During the three months ended March 31, 2015, we issued an aggregate of 446,499 common units under our ATM Program, generating net proceeds of approximately $24 million. The net proceeds from sales under the ATM Program are used for general partnership purposes.
	The table below summarizes changes in the number of units outstanding from December 31, 2014 through March 31, 2015 (in units):
		Partnership
		Common			General Partner			Total
	Balance at December 31, 2014	80,125,930			1,631,448			81,757,378
	Issuance of units under ATM Program	446,499			—			446,499
	Unit-based compensation awards (a)	33,244			—			33,244
	Balance at March 31, 2015	80,605,673			1,631,448			82,237,121
	_____________
	(a)	Unit-based compensation awards are presented net of 13,233 units withheld for taxes.
	The summarized changes in the carrying amount of our equity are as follows (in millions):
		Partnership
		Common				General Partner			Noncontrolling Interest				Total
	Balance at December 31, 2014	$	1,474			$	(19	)	$	435			$	1,890
	Equity offering under ATM Program, net of issuance costs	24				—			—				24
	Distributions (b)	(54		)		(16		)	(9		)		(79		)
	Net income attributable to partners	50				14			10				74
	Contributions (c)	5				—			—				5
	Other	1				—			—				1
	Balance at March 31, 2015	$	1,500			$	(21	)	$	436			$	1,915
	_____________
	(b) Represents cash distributions declared and paid during the period ended March 31, 2015 relating to the fourth quarter of 2014.
	(c)	Includes Tesoro and TLGP contributions to the Partnership primarily related to reimbursements for capital spending pursuant to the Amended Omnibus Agreement.
	Allocations of Net Income
	Our partnership agreement contains provisions for the allocation of net income and loss to the unitholders and the general partner. For purposes of maintaining partner capital accounts, the partnership agreement specifies that items of income and loss will be allocated among the partners in accordance with their respective percentage interest. Normal allocations according to percentage interests are made after giving effect, if any, to priority income allocations in an amount equal to incentive cash distributions fully allocated to the general partner and any special allocations.
	The following table presents the allocation of the general partner’s interest in net income (in millions, except percentage of ownership interest):
		Three Months Ended March 31,
		2015				2014
	Net income, excluding noncontrolling interest and Predecessor	$	64			$	43
	General partner’s IDRs (d)	(13		)		(6		)
	Net income available to partners	$	51			$	37
	General partner’s ownership interest	2		%		2		%
	General partner’s allocated interest in net income	$	1			$	1
	General partner’s IDRs (d)	13				6
	Total general partner’s interest in net income	$	14			$	7
	_____________
	(d)	TLGP waived $2.5 million of their IDR’s in connection with the Rockies Natural Gas Business Acquisition for the three months ended March 31, 2015.
	Cash Distributions
	Our partnership agreement, as amended, sets forth the calculation to be used to determine the amount and priority of cash distributions that the limited partner unitholders and general partner will receive. In connection with the Rockies Natural Gas Business Acquisition, our general partner has waived its right to $10 million of general partner distributions with respect to IDRs during 2015 (pro rata on a quarterly basis). The table below summarizes the quarterly distributions related to our quarterly financial results:
	Quarter Ended		Quarterly Distribution Per Unit				Total Cash Distribution including general partner IDRs (in millions)			Date of Distribution		Unitholders Record Date
	31-Dec-14		$	0.6675			$	70		February 13, 2015		February 2, 2015
	March 31, 2015 (e)		0.695				70			May 15, 2015		May 4, 2015
	_____________
	(e) This distribution was declared on April 22, 2015 and will be paid on the date of distribution.
	The allocation of total quarterly cash distributions to general and limited partners is as follows for the three months ended March 31, 2015 and 2014 (in millions). Our distributions are declared subsequent to quarter end; therefore, the table represents total cash distributions applicable to the period in which the distributions are earned.
		Three Months Ended March 31,
		2015				2014
	General partner’s distributions:
	General partner’s distributions	$	1			$	1
	General partner’s IDRs (d)	13				6
	Total general partner’s distributions	14				7
	Limited partners’ distributions:
	Common	56				23
	Subordinated	—				9
	Total limited partners’ distributions	56				32
	Total Cash Distributions	$	70			$	39
Green River Processing, LLC
Equity	EQUITY
	Membership interest percentages as of March 31, 2015 are as follows: 60% QEPFS and 40% QEP Midstream Partners Operating, LLC, which is wholly-owned by QEPM.
		QEPFS				QEP Midstream Partners Operating, LLC			Total Net Equity
		(in millions)
	Balance at December 31, 2014	$	168			$	112		$	280
	Capital contributions	4				2			6
	Distributions to owners	(10		)		(7		)	(17		)
	Net income	6				4			10
	Balance at March 31, 2015	$	168			$	111		$	279

Segment_Disclosures_Notes

Segment Disclosures (Notes)	3 Months Ended
	Mar. 31, 2015
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Segment Disclosures	SEGMENT DISCLOSURES
	Our revenues are derived from three operating segments: Gathering, Processing, Terminalling and Transportation. Our Gathering segment consists of crude oil and natural gas gathering systems in the Bakken and Rockies Regions, including our affiliate QEPM. Our Processing segment consists of four gas processing complexes, including Green River Processing, LLC, which owns one fractionation facility and two gas processing complexes. Our Terminalling and Transportation segment consists of:
	•	24 crude oil and refined products terminals and storage facilities in the western and midwestern U.S.;
	•	four marine terminals in California;
	•	140 miles of pipelines which transport products and crude oil from Tesoro’s refineries to nearby facilities in Salt Lake City and Los Angeles;
	•	the Northwest Products Pipeline, which includes a regulated common carrier products pipeline running from Salt Lake City, Utah to Spokane, Washington and a jet fuel pipeline to the Salt Lake City International Airport;
	•	a rail-car unloading facility in Washington;
	•	a petroleum coke handling and storage facility in Los Angeles; and
	•	a regulated common carrier refined products pipeline system connecting Tesoro’s Kenai refinery to terminals in Anchorage, Alaska.
	Our revenues are generated from third-party contracts and from commercial agreements we have entered into with Tesoro under which Tesoro pays us fees for gathering crude oil and natural gas, processing natural gas and distributing, transporting and storing crude oil, refined products, natural gas and natural gas liquids. The commercial agreements with Tesoro are described in greater detail in Note 3 to our Annual Report on Form 10-K for the year ended December 31, 2014. We do not have any foreign operations.
	Our operating segments are strategic business units that offer different services in various geographical locations. We evaluate the performance of each segment based on its respective operating income. Certain general and administrative expenses and interest and financing costs are excluded from segment operating income as they are not directly attributable to a specific operating segment. Identifiable assets are those used by the segment, whereas other assets are principally cash, deposits and other assets that are not associated with a specific operating segment.
	Segment information is as follows (in millions):
		Three Months Ended March 31,
		2015			2014
	REVENUES
	Gathering:
	Affiliate	$	26		$	23
	Third-party	51			2
	Total Gathering	77			25
	Processing
	Affiliate	20			—
	Third-party	47			—
	Total Processing	67			—
	Terminalling and Transportation:
	Affiliate	102			88
	Third-party	17			14
	Total Terminalling and Transportation	119			102
	Total Segment Revenues	$	263		$	127
	OPERATING INCOME
	Gathering	$	34		$	11
	Processing	24			—
	Terminalling and Transportation	62			53
	Total Segment Operating Income	120			64
	Unallocated general and administrative expenses	(12		)	(4		)
	Interest and financing costs, net	(37		)	(18		)
	Equity in earnings of unconsolidated affiliates	3			—
	NET INCOME	$	74		$	42
	CAPITAL EXPENDITURES
	Gathering	$	51		$	18
	Processing	1			—
	Terminalling and Transportation	14			8
	Total Capital Expenditures	$	66		$	26
	Identifiable assets by operating segment were as follows (in millions):
	Identifiable Assets	March 31, 2015			December 31, 2014
	Gathering	$	1,733		$	1,694
	Processing	1,653			1,612
	Terminalling and Transportation	1,353			1,352
	Other	57			107
	Total Identifiable Assets	$	4,796		$	4,765

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information (Notes)	3 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
CONDENSED CONSOLIDATING FINANCIAL INFORMATION	CONDENSED CONSOLIDATING FINANCIAL INFORMATION
	Separate condensed consolidating financial information of Tesoro Logistics LP (the “Parent”), subsidiary guarantors and non-guarantors are presented below. QEPFS, our wholly-owned subsidiary acquired on December 2, 2014, and certain of its subsidiaries were elected guarantors of these obligations in January 2015. As of March 31, 2015, TLLP and certain subsidiary guarantors have fully and unconditionally guaranteed our registered 2020 Senior Notes and 2021 Senior Notes. As a result of these guarantee arrangements, we are required to present the following condensed consolidating financial information, which should be read in conjunction with the accompanying condensed consolidated financial statements and notes thereto. The December 31, 2014 balance sheet has been adjusted to conform to the guarantor structure as of March 31, 2015. This information is provided as an alternative to providing separate financial statements for guarantor subsidiaries. Separate financial statements of the Partnership’s subsidiary guarantors are not included because the guarantees are full and unconditional and these subsidiary guarantors are 100% owned and are jointly and severally liable for TLLP’s outstanding senior notes, except for Green River Processing, LLC (“Green River Processing”) and QEPM. See page F-1 for Green River Processing’s separate financial statements and QEPM’s separate financial statements filed within its March 31, 2015 Form 10-Q (incorporated by reference as Exhibit 99.1 to this report). The separate condensed consolidating financial information is presented using the equity method of accounting for investments in subsidiaries.
	The parent company of the Partnership has no independent assets or operations and, prior to the Rockies Natural Gas Business Acquisition, the Partnership’s operations were only conducted by wholly-owned guarantor subsidiaries, other than Tesoro Logistics Finance Corp., an indirect wholly-owned subsidiary of the Partnership whose sole purpose is to act as co-issuer of any debt securities. The guarantees are full and unconditional and joint and several, subject to certain automatic customary releases, including sale, disposition, or transfer of the capital stock or substantially all of the assets of a subsidiary guarantor, exercise of legal defeasance option or covenant defeasance option, and designation of a subsidiary guarantor as unrestricted in accordance with the applicable indenture. There were no significant restrictions on the ability of the Partnership or any guarantor to obtain funds from its subsidiaries by dividend or loan. None of the assets of the Partnership or its guarantors represent restricted net assets pursuant to Rule 4-08(e)(3) of Regulation S-X under the Securities Act. As a result, we have not provided condensed consolidating financial information for the three months ended March 31, 2014.
	Condensed Consolidating Statement of Operations
	for the Three Months Ended March 31, 2015
	(In millions)
		Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
	REVENUES
	Affiliate	$	—		$	137		$	13		$	6		$	(8	)	$	148
	Third-party	—			69			47			1			(2		)	115
	Total Revenues	—			206			60			7			(10		)	263
	COSTS AND EXPENSES
	Operating and maintenance expenses	—			78			24			—			(8		)	94
	Imbalance settlement gains and reimbursements from Tesoro	—			(8		)	—			—			—			(8		)
	General and administrative expenses	6			13			6			—			—			25
	Depreciation and amortization expenses	—			29			7			3			5			44
	Total Costs and Expenses	6			112			37			3			(3		)	155
	OPERATING INCOME (LOSS)	(6		)	94			23			4			(7		)	108
	Interest and financing costs, net	(39		)	3			(1		)	—			—			(37		)
	Equity in earnings of unconsolidated affiliates	—			1			2			—			—			3
	Equity in earnings of subsidiaries	109			18			3			—			(130		)	—
	NET INCOME	$	64		$	116		$	27		$	4		$	(137	)	$	74
	Loss attributable to Predecessors	—			—			—			—			—			—
	Net income attributable to noncontrolling interest	—			—			(9		)	(1		)	—			(10		)
	Net income attributable to partners	$	64		$	116		$	18		$	3		$	(137	)	$	64
	Condensed Consolidating Balance Sheet as of March 31, 2015
	(In millions)
		Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
	ASSETS
	Current Assets
	Cash and cash equivalents	$	3		$	3		$	7		$	3		$	—		$	16
	Receivables, net
	Trade	—			94			31			—			—			125
	Affiliate	5			67			22			3			(21		)	76
	Other	—			16			—			—			—			16
	Prepayments and other	1			3			—			—			—			4
	Total Current Assets	9			183			60			6			(21		)	237
	Net property, plant and equipment	—			2,114			561			185			475			3,335
	Intangibles	—			585			—			—			381			966
	Goodwill	—			76			—			—			92			168
	Investment in unconsolidated affiliates	—			18			25			—			16			59
	Investments in subsidiaries	4,465			1,327			150			—			(5,942		)	—
	Long-term intercompany receivable	—			565			—			2			(567		)	—
	Other noncurrent assets	1			30			—			—			—			31
	Total Assets	$	4,475		$	4,898		$	796		$	193		$	(5,566	)	$	4,796
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable
	Trade	$	12		$	90		$	10		$	—		$	—		$	112
	Affiliate	3			64			22			—			(21		)	68
	Accrued interest and financing costs	62			—			—			—			—			62
	Other current liabilities	22			35			2			—			(2		)	57
	Total Current Liabilities	99			189			34			—			(23		)	299
	Long-term intercompany payable	384			—			204			—			(588		)	—
	Other noncurrent liabilities	—			41			29			1			(9		)	62
	Debt, net of unamortized issuance costs	2,513			7			—			—			—			2,520
	Equity - TLLP	1,479			4,661			498			150			(5,309		)	1,479
	Equity - Noncontrolling interest	—			—			31			42			363			436
	Total Liabilities and Equity	$	4,475		$	4,898		$	796		$	193		$	(5,566	)	$	4,796
	Condensed Consolidating Balance Sheet as of December 31, 2014 (a)
	(In millions)
		Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
	ASSETS
	Current Assets
Cash and cash equivalents	$	—		$	(2	)	$	19		$	2		$	—		$	19
Receivables, net
Trade	—			93			28			1			—			122
Affiliate	3			59			7			—			—			69
Other	—			18			—			—			—			18
Prepayments and other	3			4			—			—			—			7
Total Current Assets	6			172			54			3			—			235
Net property, plant and equipment	1			2,073			566			188			478			3,306
Intangibles	—			590			—			—			383			973
Goodwill	—			48			—			—			116			164
Investment in unconsolidated affiliates	—			18			25			—			14			57
Investments in subsidiaries	4,348			1,325			152			—			(5,825		)	—
Long-term intercompany receivable	—			516			—			5			(521		)	—
Other noncurrent assets	—			30			—			—			—			30
Total Assets	$	4,355		$	4,772		$	797		$	196		$	(5,355	)	$	4,765
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable
Trade	$	6		$	102		$	18		$	—		$	—		$	126
Affiliate	2			45			6			—			—			53
Accrued interest and financing costs	28			—			—			—			—			28
Other current liabilities	21			56			4			—			(2		)	79
Total Current Liabilities	57			203			28			—			(2		)	286
Long-term intercompany payable	307			—			214			—			(521		)	—
Other noncurrent liabilities	—			25			29			1			(10		)	45
Debt, net of unamortized issuance costs	2,536			8			—			—			—			2,544
Equity - TLLP	1,455			4,536			497			152			(5,185		)	1,455
Equity - Noncontrolling interest	—			—			29			43			363			435
Total Liabilities and Equity	$	4,355		$	4,772		$	797		$	196		$	(5,355	)	$	4,765
_____________
(a) Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.
Condensed Consolidating Statement of Cash Flows
for the Three Months Ended March 31, 2015
(In millions)
	Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net cash from (used in) operating activities	$	(4	)	$	153		$	25		$	5		$	(27	)	$	152
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	—			(79		)	(3		)	—			—			(82		)
Investments in subsidiaries	(7		)	(3		)	—			—			10			—
Net cash used in investing activities	(7		)	(82		)	(3		)	—			10			(82		)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	24			—			—			—			—			24
Quarterly distributions to unitholders	(54		)	—			(9		)	—			9			(54		)
Quarterly distributions to general partner	(16		)	—			(1		)	(5		)	6			(16		)
Distributions to noncontrolling interest	—			—			(7		)	(2		)	—			(9		)
Distributions to subsidiaries	—			—			(10		)	—			10			—
Borrowings under revolving credit agreement	99			(9		)	9			—			—			99
Repayments under revolving credit agreement	(124		)	22			(22		)	—			—			(124		)
Contributions	—			7			3			—			(10		)	—
Intercompany borrowings (payments)	78			(86		)	3			3			2			—
Capital contributions by affiliate	7			—			—			—			—			7
Net cash from (used in) financing activities	14			(66		)	(34		)	(4		)	17			(73		)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3			5			(12		)	1			—			(3		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	—			(2		)	19			2			—			19
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	7		$	3		$	—		$	16

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
New accounting pronouncement, policy	New Accounting Standards
	Revenue Recognition. The Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) in May 2014, providing accounting guidance for all revenue arising from contracts to provide goods or services to customers. The requirements from the new ASU are effective for interim and annual periods beginning after December 15, 2016, and early adoption is not permitted. The FASB has proposed a one-year deferral of the effective date; however, this proposal has not been finalized. The standard allows for either full retrospective adoption or modified retrospective adoption. At this time, we are evaluating the guidance to determine the method of adoption and the impact of this ASU on our financial statements and related disclosures.
	Pushdown Accounting. The SEC released a Staff Accounting Bulletin (“SAB”) in November 2014, overturning portions of the interpretive guidance regarding pushdown accounting. Effective November 18, 2014, the new bulletin aligns the existing guidance to the ASU issued by the FASB in October 2014. Under the new guidance, pushdown accounting can be applied in the separate financial statements of the acquired entity upon completion of the acquisition or in a subsequent period. This impacts the stand-alone financial statements of the subsidiary, but does not alter the existing reporting requirements for the parent company to record the acquired assets, liabilities, and non-controlling interests in consolidated financial statements. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period. If pushdown accounting is applied, that election is irrevocable. The SEC responded by rescinding its guidance on pushdown accounting, which had required registrants to apply pushdown accounting in certain circumstances. With regard to the Rockies Natural Gas Business Acquisition, we did not elect to apply pushdown accounting to certain acquired entities.
	Treatment of Predecessor in EPU calculation. The Emerging Issues Task Force (“EITF”) reached a final consensus on Issue 14-A affirming their stance to require a master limited partnership to allocate earnings or losses of transferred net assets for periods prior to asset purchases from Tesoro entirely to the general partner when calculating earnings per unit (“EPU”). The final consensus is effective for interim and annual periods beginning after December 15, 2015 and early adoption is permitted. We have elected to adopt this guidance beginning in the first quarter of 2015. Adoption of the final consensus did not impact the disclosed amounts of earnings per unit attributable to limited partners; however, the allocation of earnings presented in our EPU disclosure for the three months ended March 31, 2014 has been modified to conform to the requirements of the final consensus. There were no asset purchases from Tesoro during the three months ended March 31, 2015.
	Debt Issuance Costs. In April 2015, the FASB issued ASU 2015-03 which will simplify the presentation of debt issuance costs. Under the new ASU, debt issuance costs related to a recognized debt liability will be presented in the balance sheet as a direct deduction from the carrying amount of the related debt liability. As a result, our balance sheet will reflect a reclassification of unamortized debt issuance costs from other noncurrent assets to debt. This ASU is effective for interim and annual periods beginning after December 15, 2015, and early adoption is permitted. We have adopted this standard effective as of March 31, 2015 and applied the changes retrospectively to prior periods presented. Adoption of this standard has resulted in the reclassification of $49 million from other noncurrent assets to debt on the balance sheet at December 31, 2014. Unamortized debt issuance costs of $47 million are recorded as a reduction to debt on the balance sheet as March 31, 2015.
Consolidation, Policy	Our consolidated financial statements include QEPM, a variable interest entity. As the general partner of QEPM, we have the sole ability to direct the activities of QEPM that most significantly impact its economic performance. We are also considered to be the primary beneficiary for accounting purposes. In the event QEPM incurs a loss, our operating results will reflect QEPM’s loss, net of intercompany eliminations.
Basis of accounting, policy	We prepare our condensed combined consolidated financial statements in conformity with U.S. GAAP, which requires management to make estimates and assumptions that affect the amounts of assets and liabilities and revenues and expenses reported as of and during the periods presented.
Green River Processing, LLC
New accounting pronouncement, policy	Recent Accounting Developments
	Revenue Recognition. The Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) in May 2014 providing accounting guidance for all revenue arising from contracts to provide goods or services to customers. The requirements from the new ASU are effective for interim and annual periods beginning after December 15, 2016, and early adoption is not permitted. The FASB has proposed a one-year deferral of the effective date, however this proposal has not been finalized at this time. The standard allows for either full retrospective adoption or modified retrospective adoption. At this time, we are evaluating the guidance to determine the method of adoption and the impact of this ASU on our financial statements and related disclosures.
	Pushdown Accounting. The Securities and Exchange Commission (“SEC”) released a Staff Accounting Bulletin in November 2014, overturning portions of the interpretive guidance regarding pushdown accounting. Effective November 18, 2014, the new bulletin aligns the existing guidance to the ASU issued by the FASB in October 2014. Under the new guidance, pushdown accounting can be applied in the separate financial statements of the acquired entity upon completion of the acquisition or in a subsequent period. This impacts the stand-alone financial statements of the subsidiary, but does not alter the existing reporting requirements for the parent company to record the acquired assets, liabilities, and non-controlling interests in consolidated financial statements. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period. If pushdown accounting is applied, that election is irrevocable. The SEC responded by rescinding its guidance on pushdown accounting, which had required registrants to apply pushdown accounting in certain circumstances. With regard to the Acquisition, TLLP elected not to apply pushdown accounting to Green River Processing.
Basis of accounting, policy	Basis of Presentation
	The financial statements were prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). All significant intercompany accounts and transactions have been eliminated in consolidation. Financial results reported for the 2014 Quarter have been prepared from the historical accounting records owned and maintained by QEP Resources. Further, financial information for the 2015 Quarter was carved out from QEPFSC data as separate and distinct accounts for Green River Processing Operations have not been maintained. Financial results reported for the three months ended March 31, 2015 have been prepared from records owned and maintained by TLLP.
	The preparation of the financial statements and notes in conformity with GAAP requires that management formulate estimates and assumptions that affect the amounts of assets and liabilities and revenues and expenses reported as of and during the periods presented. The Company reviews these estimates on an ongoing basis using currently available information. Changes in facts and circumstances may result in revised estimates, and actual results could differ from those estimates.

Net_Income_Per_Unit_Policies

Net Income Per Unit (Policies)	3 Months Ended
	Mar. 31, 2015
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax [Abstract]
Net income per unit, policy	We use the two-class method when calculating the net income per unit applicable to limited partners, because we have more than one participating security. At March 31, 2015, our participating securities consist of common units, general partner units and IDRs. Net income earned by the Partnership is allocated between the limited and general partners in accordance with our partnership agreement. We base our calculation of net income per unit on the weighted average number of common and subordinated limited partner units outstanding during the period.
	Effective May 16, 2014, all of the outstanding subordinated units were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. The conversion did not impact the amount of the cash distribution paid or the total number of the Partnership’s outstanding units representing limited partner interests.

Acquisitions_Acquisitions_Tabl

Acquisitions Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The table below reflects the preliminary acquisition date purchase price allocation as of March 31, 2015 (in millions):
	Cash	$	31
	Accounts receivable	120
	Prepayments and other	7
	Property, plant and equipment	1,735
	Intangibles	976
	Goodwill	159
	Investment in unconsolidated affiliates	57
	Other noncurrent assets	23
	Accounts payable	(81		)
	Other current liabilities	(47		)
	Other noncurrent liabilities	(31		)
	Noncontrolling interest	(432		)
	Total purchase price	$	2,517

RelatedParty_Transactions_Tabl

Related-Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2015
Schedule of related party transactions	A summary of revenue and expense transactions with Tesoro, including expenses directly charged and allocated to our Predecessors, are as follows (in millions):
		Three Months Ended March 31,
		2015			2014
	Revenues (a)	$	148		$	111
	Operating and maintenance expenses	25			20
	Imbalance settlement gains and reimbursements from Tesoro (b)	8			7
	General and administrative expenses	17			7
	____________
	(a)	Tesoro accounted for 56% and 88% of our total revenues for the three months ended March 31, 2015 and 2014, respectively.
	(b)	Includes imbalance settlement gains of $2 million for both the three months ended March 31, 2015 and 2014. Also includes reimbursements primarily related to pressure testing and repairs and maintenance costs pursuant to the Amended Omnibus Agreement of $6 million and $5 million for the three months ended March 31, 2015 and 2014, respectively.
Green River Processing, LLC
Schedule of related party transactions	The following table summarizes the other affiliate revenue (expense) transactions with QEP Resources and QEPFSC (“QEP Entities”) and Tesoro, TRMC, Tesoro Logistics GP, LLC (“TLGP”), TLLP or any of TLLP’s subsidiaries (“Tesoro Entities”):
			Tesoro Entities			QEP Entities
			Three Months Ended March 31,
			2015			2014
			(in millions)
	Revenue from affiliate		$	11		$	7
	General and administrative		2			4

Net_Income_Per_Unit_Tables

Net Income Per Unit (Tables)	3 Months Ended
	Mar. 31, 2015
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax [Abstract]
Schedule of calculation of net income per unit	The calculation of net income per unit is as follows (in millions, except unit and per unit amounts):
		Three Months Ended March 31,
		2015			2014
	Net income	$	74		$	42
	Net income attributable to noncontrolling interest	(10		)	—
	Net income, excluding noncontrolling interest (a)	64			42
	General partner’s distributions (including IDRs) (b)	(14		)	(7		)
	Limited partners’ distributions on common units	(56		)	(23		)
	Limited partners’ distributions on subordinated units (c)	—			(9		)
	Distributions less (greater) than earnings	$	(6	)	$	3
	General partner’s earnings:
	Distributions (including IDRs) (b)	$	14		$	7
	Allocation of distributions less (greater) than earnings (a)	—			1
	Total general partner’s earnings	$	14		$	8
	Limited partners’ earnings on common units:
	Distributions	$	56		$	23
	Allocation of distributions less (greater) than earnings	(6		)	1
	Total limited partners’ earnings on common units	$	50		$	24
	Limited partners’ earnings on subordinated units (c):
	Distributions	$	—		$	9
	Allocation of distributions less (greater) than earnings	—			1
	Total limited partners’ earnings on subordinated units	$	—		$	10
	Weighted average limited partner units outstanding:
	Common units - basic	80,250,208			39,186,006
	Common unit equivalents	31,780			98,382
	Common units - diluted	80,281,988			39,284,388
	Subordinated units - basic and diluted (c)	—			15,254,890
	Net income per limited partner unit:
	Common - basic and diluted	$	0.63		$	0.64
	Subordinated - basic and diluted	$	—		$	0.64
	____________
	(a)	In April 2015, the FASB ratified an EITF consensus on Issue 14-A concerning historical earnings per unit for master limited partnership drop down transactions. We have revised the historical allocation of general partner earnings to include the Predecessor loss TLLP incurred during the three months ended March 31, 2014. See Note 1 for additional information on the new guidance.
	(b)	General partner’s distributions (including IDRs) consist of an approximate 2% general partner interest and IDRs, which entitle the general partner to receive increasing percentages, up to 50%, of quarterly distributions in excess of $0.388125 per unit per quarter. The amount above reflects earnings distributed to our general partner (including IDRs) net of $2.5 million in IDRs waived by TLGP in connection with the Rockies Natural Gas Business Acquisition. See Note 12 of our Annual Report on Form 10-K for the year ended December 31, 2014, for further discussion related to IDRs.
	(c)	On May 16, 2014, the subordinated units were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. Distributions and the Partnership’s net income were allocated to the subordinated units through May 15, 2014.

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property, plant and equipment	Property, plant and equipment, at cost, is as follows (in millions):
		March 31, 2015			December 31, 2014
	Gathering	$	1,558		$	1,507
	Processing	541			539
	Terminalling and Transportation	1,492			1,478
	Other	26			27
	Gross Property, Plant and Equipment	3,617			3,551
	Accumulated depreciation	(282		)	(245		)
	Net Property, Plant and Equipment	$	3,335		$	3,306
Green River Processing, LLC
Property, plant and equipment	A summary of the historical cost of Green River Processing’s property, plant and equipment is as follows:
		March 31, 2015			December 31, 2014
		(in millions)
	Total property, plant and equipment	$	317		$	317
	Accumulated depreciation	(41		)	(39		)
	Total net property, plant and equipment	$	276		$	278

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Long-term Debt, Unclassified [Abstract]
Schedule of debt	Our debt balance at March 31, 2015 and December 31, 2014 was as follows (in millions):
		March 31, 2015				December 31, 2014
	Total debt	$	2,563			$	2,588
	Unamortized issuance costs (a)	(43		)		(44		)
	Current maturities	—				—
	Debt, net of current maturities and unamortized issuance costs	$	2,520			$	2,544
	____________
	(a) Includes unamortized premium of $4 million and $5 million as of March 31, 2015 and December 31, 2014, respectively.
Schedule of line of credit facilities	The Revolving Credit Facility was subject to the following expenses and fees as of March 31, 2015:
	Credit Facility		30 day Eurodollar (LIBOR) Rate		Eurodollar Margin		Base Rate		Base Rate Margin	Commitment Fee
										(unused portion)
	Revolving Credit Facility (b)		0.18%		2.50%		3.25%		1.50%	0.50%
	____________
	(b) We have the option to elect if the borrowings will bear interest at either a base rate plus the base rate margin, or a Eurodollar rate, for the applicable period, plus the Eurodollar margin at the time of the borrowing. The applicable margin varies based upon a certain leverage ratio, as defined by the Revolving Credit Facility. We also incur commitment fees for the unused portion of the Revolving Credit Facility at an annual rate. Letters of credit outstanding under the Revolving Credit Facility incur fees at the Eurodollar margin rate.

Equity_Tables

Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Schedule of partners' capital	The table below summarizes changes in the number of units outstanding from December 31, 2014 through March 31, 2015 (in units):
		Partnership
		Common			General Partner			Total
	Balance at December 31, 2014	80,125,930			1,631,448			81,757,378
	Issuance of units under ATM Program	446,499			—			446,499
	Unit-based compensation awards (a)	33,244			—			33,244
	Balance at March 31, 2015	80,605,673			1,631,448			82,237,121
	_____________
	(a)	Unit-based compensation awards are presented net of 13,233 units withheld for taxes.
	The summarized changes in the carrying amount of our equity are as follows (in millions):
		Partnership
		Common				General Partner			Noncontrolling Interest				Total
	Balance at December 31, 2014	$	1,474			$	(19	)	$	435			$	1,890
	Equity offering under ATM Program, net of issuance costs	24				—			—				24
	Distributions (b)	(54		)		(16		)	(9		)		(79		)
	Net income attributable to partners	50				14			10				74
	Contributions (c)	5				—			—				5
	Other	1				—			—				1
	Balance at March 31, 2015	$	1,500			$	(21	)	$	436			$	1,915
	_____________
	(b) Represents cash distributions declared and paid during the period ended March 31, 2015 relating to the fourth quarter of 2014.
	(c)	Includes Tesoro and TLGP contributions to the Partnership primarily related to reimbursements for capital spending pursuant to the Amended Omnibus Agreement.
Schedule of calculation of net income applicable to partners	The following table presents the allocation of the general partner’s interest in net income (in millions, except percentage of ownership interest):
		Three Months Ended March 31,
		2015				2014
	Net income, excluding noncontrolling interest and Predecessor	$	64			$	43
	General partner’s IDRs (d)	(13		)		(6		)
	Net income available to partners	$	51			$	37
	General partner’s ownership interest	2		%		2		%
	General partner’s allocated interest in net income	$	1			$	1
	General partner’s IDRs (d)	13				6
	Total general partner’s interest in net income	$	14			$	7
	_____________
	(d)	TLGP waived $2.5 million of their IDR’s in connection with the Rockies Natural Gas Business Acquisition for the three months ended March 31, 2015.
Schedule of quarterly distributions	The table below summarizes the quarterly distributions related to our quarterly financial results:
	Quarter Ended		Quarterly Distribution Per Unit				Total Cash Distribution including general partner IDRs (in millions)			Date of Distribution		Unitholders Record Date
	31-Dec-14		$	0.6675			$	70		February 13, 2015		February 2, 2015
	March 31, 2015 (e)		0.695				70			May 15, 2015		May 4, 2015
	_____________
	(e) This distribution was declared on April 22, 2015 and will be paid on the date of distribution.
Schedule of distributions earned by general and limited partners	The allocation of total quarterly cash distributions to general and limited partners is as follows for the three months ended March 31, 2015 and 2014 (in millions). Our distributions are declared subsequent to quarter end; therefore, the table represents total cash distributions applicable to the period in which the distributions are earned.
		Three Months Ended March 31,
		2015				2014
	General partner’s distributions:
	General partner’s distributions	$	1			$	1
	General partner’s IDRs (d)	13				6
	Total general partner’s distributions	14				7
	Limited partners’ distributions:
	Common	56				23
	Subordinated	—				9
	Total limited partners’ distributions	56				32
	Total Cash Distributions	$	70			$	39
Green River Processing, LLC
Schedule of partners' capital	Membership interest percentages as of March 31, 2015 are as follows: 60% QEPFS and 40% QEP Midstream Partners Operating, LLC, which is wholly-owned by QEPM.
		QEPFS				QEP Midstream Partners Operating, LLC			Total Net Equity
		(in millions)
	Balance at December 31, 2014	$	168			$	112		$	280
	Capital contributions	4				2			6
	Distributions to owners	(10		)		(7		)	(17		)
	Net income	6				4			10
	Balance at March 31, 2015	$	168			$	111		$	279

Segment_Disclosures_Tables

Segment Disclosures (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Schedule of segment reporting information, by segment	Segment information is as follows (in millions):
		Three Months Ended March 31,
		2015			2014
	REVENUES
	Gathering:
	Affiliate	$	26		$	23
	Third-party	51			2
	Total Gathering	77			25
	Processing
	Affiliate	20			—
	Third-party	47			—
	Total Processing	67			—
	Terminalling and Transportation:
	Affiliate	102			88
	Third-party	17			14
	Total Terminalling and Transportation	119			102
	Total Segment Revenues	$	263		$	127
	OPERATING INCOME
	Gathering	$	34		$	11
	Processing	24			—
	Terminalling and Transportation	62			53
	Total Segment Operating Income	120			64
	Unallocated general and administrative expenses	(12		)	(4		)
	Interest and financing costs, net	(37		)	(18		)
	Equity in earnings of unconsolidated affiliates	3			—
	NET INCOME	$	74		$	42
	CAPITAL EXPENDITURES
	Gathering	$	51		$	18
	Processing	1			—
	Terminalling and Transportation	14			8
	Total Capital Expenditures	$	66		$	26
	Identifiable assets by operating segment were as follows (in millions):
	Identifiable Assets	March 31, 2015			December 31, 2014
	Gathering	$	1,733		$	1,694
	Processing	1,653			1,612
	Terminalling and Transportation	1,353			1,352
	Other	57			107
	Total Identifiable Assets	$	4,796		$	4,765

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Statement of Operations	Condensed Consolidating Statement of Operations
	for the Three Months Ended March 31, 2015
	(In millions)
		Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
	REVENUES
	Affiliate	$	—		$	137		$	13		$	6		$	(8	)	$	148
	Third-party	—			69			47			1			(2		)	115
	Total Revenues	—			206			60			7			(10		)	263
	COSTS AND EXPENSES
	Operating and maintenance expenses	—			78			24			—			(8		)	94
	Imbalance settlement gains and reimbursements from Tesoro	—			(8		)	—			—			—			(8		)
	General and administrative expenses	6			13			6			—			—			25
	Depreciation and amortization expenses	—			29			7			3			5			44
	Total Costs and Expenses	6			112			37			3			(3		)	155
	OPERATING INCOME (LOSS)	(6		)	94			23			4			(7		)	108
	Interest and financing costs, net	(39		)	3			(1		)	—			—			(37		)
	Equity in earnings of unconsolidated affiliates	—			1			2			—			—			3
	Equity in earnings of subsidiaries	109			18			3			—			(130		)	—
	NET INCOME	$	64		$	116		$	27		$	4		$	(137	)	$	74
	Loss attributable to Predecessors	—			—			—			—			—			—
	Net income attributable to noncontrolling interest	—			—			(9		)	(1		)	—			(10		)
	Net income attributable to partners	$	64		$	116		$	18		$	3		$	(137	)	$	64
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet as of March 31, 2015
	(In millions)
		Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
	ASSETS
	Current Assets
	Cash and cash equivalents	$	3		$	3		$	7		$	3		$	—		$	16
	Receivables, net
	Trade	—			94			31			—			—			125
	Affiliate	5			67			22			3			(21		)	76
	Other	—			16			—			—			—			16
	Prepayments and other	1			3			—			—			—			4
	Total Current Assets	9			183			60			6			(21		)	237
	Net property, plant and equipment	—			2,114			561			185			475			3,335
	Intangibles	—			585			—			—			381			966
	Goodwill	—			76			—			—			92			168
	Investment in unconsolidated affiliates	—			18			25			—			16			59
	Investments in subsidiaries	4,465			1,327			150			—			(5,942		)	—
	Long-term intercompany receivable	—			565			—			2			(567		)	—
	Other noncurrent assets	1			30			—			—			—			31
	Total Assets	$	4,475		$	4,898		$	796		$	193		$	(5,566	)	$	4,796
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable
	Trade	$	12		$	90		$	10		$	—		$	—		$	112
	Affiliate	3			64			22			—			(21		)	68
	Accrued interest and financing costs	62			—			—			—			—			62
	Other current liabilities	22			35			2			—			(2		)	57
	Total Current Liabilities	99			189			34			—			(23		)	299
	Long-term intercompany payable	384			—			204			—			(588		)	—
	Other noncurrent liabilities	—			41			29			1			(9		)	62
	Debt, net of unamortized issuance costs	2,513			7			—			—			—			2,520
	Equity - TLLP	1,479			4,661			498			150			(5,309		)	1,479
	Equity - Noncontrolling interest	—			—			31			42			363			436
	Total Liabilities and Equity	$	4,475		$	4,898		$	796		$	193		$	(5,566	)	$	4,796
	Condensed Consolidating Balance Sheet as of December 31, 2014 (a)
	(In millions)
		Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
	ASSETS
	Current Assets
	Cash and cash equivalents	$	—		$	(2	)	$	19		$	2		$	—		$	19
	Receivables, net
	Trade	—			93			28			1			—			122
	Affiliate	3			59			7			—			—			69
	Other	—			18			—			—			—			18
	Prepayments and other	3			4			—			—			—			7
	Total Current Assets	6			172			54			3			—			235
	Net property, plant and equipment	1			2,073			566			188			478			3,306
	Intangibles	—			590			—			—			383			973
	Goodwill	—			48			—			—			116			164
	Investment in unconsolidated affiliates	—			18			25			—			14			57
	Investments in subsidiaries	4,348			1,325			152			—			(5,825		)	—
	Long-term intercompany receivable	—			516			—			5			(521		)	—
	Other noncurrent assets	—			30			—			—			—			30
	Total Assets	$	4,355		$	4,772		$	797		$	196		$	(5,355	)	$	4,765
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable
	Trade	$	6		$	102		$	18		$	—		$	—		$	126
	Affiliate	2			45			6			—			—			53
	Accrued interest and financing costs	28			—			—			—			—			28
	Other current liabilities	21			56			4			—			(2		)	79
	Total Current Liabilities	57			203			28			—			(2		)	286
	Long-term intercompany payable	307			—			214			—			(521		)	—
	Other noncurrent liabilities	—			25			29			1			(10		)	45
Debt, net of unamortized issuance costs	2,536			8			—			—			—			2,544
Equity - TLLP	1,455			4,536			497			152			(5,185		)	1,455
Equity - Noncontrolling interest	—			—			29			43			363			435
Total Liabilities and Equity	$	4,355		$	4,772		$	797		$	196		$	(5,355	)	$	4,765
_____________
(a) Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows
	for the Three Months Ended March 31, 2015
	(In millions)
		Parent			Guarantor Subsidiaries			Non Wholly-owned Guarantors			Non-Guarantors			Eliminations			Consolidated
	CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
	Net cash from (used in) operating activities	$	(4	)	$	153		$	25		$	5		$	(27	)	$	152
	CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
	Capital expenditures	—			(79		)	(3		)	—			—			(82		)
	Investments in subsidiaries	(7		)	(3		)	—			—			10			—
	Net cash used in investing activities	(7		)	(82		)	(3		)	—			10			(82		)
	CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
	Proceeds from issuance of common units, net of issuance costs	24			—			—			—			—			24
	Quarterly distributions to unitholders	(54		)	—			(9		)	—			9			(54		)
	Quarterly distributions to general partner	(16		)	—			(1		)	(5		)	6			(16		)
	Distributions to noncontrolling interest	—			—			(7		)	(2		)	—			(9		)
	Distributions to subsidiaries	—			—			(10		)	—			10			—
	Borrowings under revolving credit agreement	99			(9		)	9			—			—			99
	Repayments under revolving credit agreement	(124		)	22			(22		)	—			—			(124		)
	Contributions	—			7			3			—			(10		)	—
	Intercompany borrowings (payments)	78			(86		)	3			3			2			—
	Capital contributions by affiliate	7			—			—			—			—			7
	Net cash from (used in) financing activities	14			(66		)	(34		)	(4		)	17			(73		)
	INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3			5			(12		)	1			—			(3		)
	CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	—			(2		)	19			2			—			19
	CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	7		$	3		$	—		$	16

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation, Acquisition (Details) (USD $)	3 Months Ended	0 Months Ended
In Billions, unless otherwise specified	Mar. 31, 2015	Dec. 02, 2014	Jul. 01, 2014	Sep. 30, 2014
QEP Midstream Partners, LP
Acquisition
Limited partnership ownership interest	57.80%
Rockies Natural Gas Business Acquisition
Acquisition
Effective date of acquisition		2-Dec-14
Purchase price		$2.50
Phase One | West Coast Logistics Assets Acquisition
Acquisition
Effective date of acquisition			1-Jul-14
Phase Two | West Coast Logistics Assets Acquisition
Acquisition
Effective date of acquisition				30-Sep-14
Truck Terminal | West Coast Logistics Assets Acquisition
Acquisition
Number of assets (assets)			3
Storage Tank | West Coast Logistics Assets Acquisition
Acquisition
Number of assets (assets)			10
Rail Loading And unloading Facility | West Coast Logistics Assets Acquisition
Acquisition
Number of assets (assets)			2
Refined Products Pipeline
Acquisition
Number of assets (assets)	1
Refined Products Pipeline | Phase Two | West Coast Logistics Assets Acquisition
Acquisition
Number of assets (assets)				1

Organization_and_Basis_of_Pres3

Organization and Basis of Presentation Subsequent Event (Details)	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Apr. 06, 2015
Significant Acquisitions and Disposals
Expected Issuance of units under Merger agreement	446,499
Subsequent Event | Merger Agreement
Significant Acquisitions and Disposals
Merger agreement date		6-Apr-15
Limited Partner Common Units, Conversion Ratio		0.3088
Expected Issuance of units under Merger agreement		7,100,000

Organization_and_Basis_of_Pres4

Organization and Basis of Presentation, Fair Value (Details) (USD $)	3 Months Ended
In Billions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Percent of trade payables outstanding	2.00%
Percent of trade receivables outstanding	2.00%
Debt, carrying value	$2.60	$2.60
Debt, fair value	$2.70	$2.60
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair Value Assumptions, Expected Term	90 days

Organization_and_Basis_of_Pres5

Organization and Basis of Presentation New Accounting Standards (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
New Accounting Pronouncements or Change in Accounting Principle
Unamortized debt issuance costs	($47)
New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle
Unamortized debt issuance costs		($49)

Organization_and_Basis_of_Pres6

Organization and Basis of Presentation Green River Processing (Details)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 02, 2014	Feb. 06, 2014	Jul. 01, 2014
General and limited partnership units, ownership interest in QEP Midstream Partners Operating, LLC	2.00%	2.00%
Green River Processing, LLC
Formation date				6-Feb-14
Effective date of acquisition			2-Dec-14
QEP Midstream Operating, LLC | Green River Processing, LLC
Transaction, date					1-Jul-14
Ownership interest	40.00%
QEPFS | Green River Processing, LLC
Limited partnership ownership interest	60.00%
General and limited partnership units, ownership interest in QEP Midstream Partners Operating, LLC	58.00%
5.875% Senior Notes due 2020
Maturity date	1-Oct-20
Interest rate	5.88%
6.125% Senior Notes due 2021
Maturity date	15-Oct-21
Interest rate	6.13%

Acquisitions_Rockies_Natural_G

Acquisitions Rockies Natural Gas Business Acquisition (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 02, 2014	Dec. 31, 2014
Acquisition
General partner's ownership interest	2.00%	2.00%
Weighted average useful life	35 years
Gross carrying value of intangible assets	$976,000,000
Accumulated amortization	10,000,000
Amortization expense	7,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill	168,000,000			164,000,000	[1]
Investments in unconsolidated affiliates	59,000,000			57,000,000	[1]
Rockies Natural Gas Business Acquisition
Acquisition
Effective date of acquisition			2-Dec-14
Purchase price			2,500,000,000
Purchase price adjustment	7,000,000
Integration costs	3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash	31,000,000
Accounts receivable	120,000,000
Prepayments and other	7,000,000
Property, plant and equipment	1,735,000,000
Intangibles	976,000,000
Goodwill	159,000,000
Investments in unconsolidated affiliates	57,000,000
Other noncurrent assets	23,000,000
Accounts payable	-81,000,000
Other current liabilities	-47,000,000
Other noncurrent liabilities	-31,000,000
Noncontrolling interest	-432,000,000
Total purchase price	2,517,000,000
Pro forma revenues		225,000,000
Pro forma net income		49,000,000
QEP Midstream Partners, LP
Acquisition
Ownership interest			55.80%
General partner's ownership interest			2.00%
QEP Midstream Partners GP, LLC
Acquisition
Ownership interest			100.00%
Gathering | Rockies Natural Gas Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill	17,000,000
Processing | Rockies Natural Gas Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill	$142,000,000
[1]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.

Acquisitions_2014_Acquisition_

Acquisitions 2014 Acquisition (Details) (West Coast Logistics Assets Acquisition)	0 Months Ended
	Jul. 01, 2014	Sep. 30, 2014
Phase One
Acquisition
Effective date of acquisition	1-Jul-14
Phase Two
Acquisition
Effective date of acquisition		30-Sep-14

RelatedParty_Transactions_Summ

Related-Party Transactions, Summary of Transactions (Details) (USD $)	3 Months Ended					0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014	Mar. 31, 2014		Apr. 22, 2015		Dec. 02, 2014
Related Party Transactions
Revenues	$148	[1]		$111	[1],[2]
Operating and maintenance expenses	25			20
Imbalance settlement gains and reimbursements from Tesoro	8	[3]		7	[2],[3]
General and administrative expenses	17			7
Risks and Uncertainties
Concentration risk, percentage	56.00%			88.00%
Imbalance settlement gains	2			2
Reimbursements from Tesoro	6	[2]		5	[2]
Quarterly distributions
Cash distributions paid to Tesoro and TLGP	35
Cash distributions per unit (dollars per unit)			$0.67
Distribution date			13-Feb-15
Cash distributions declared	56			32
Subsequent Event
Quarterly distributions
Declaration date						22-Apr-15
Cash distributions per unit (dollars per unit)						$0.70	[4]
Distribution date						15-May-15	[4]
Cash distributions declared						33
Rockies Natural Gas Business Acquisition
Quarterly distributions
General partner distribution amount forfeited	2.5
Annually | Rockies Natural Gas Business Acquisition
Quarterly distributions
General partner distribution amount forfeited	10
Green River Processing, LLC
Related Party Transactions
Limited liability company agreement annual fee	7
Revenues	11			7
Tesoro Entities | Green River Processing, LLC
Related Party Transactions
Revenues	11
General and administrative expenses	2
QEP Entities | Green River Processing, LLC
Related Party Transactions
Revenues				7
General and administrative expenses				$4
Keep Whole Commodity Fee Agreement | Green River Processing, LLC
Related Party Transactions
Transaction, date								2-Dec-14
Term (years)								5 years
[1]	Tesoro accounted for 56% and 88% of our total revenues for the three months ended MarchB 31, 2015 and 2014, respectively.
[2]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[3]	Includes imbalance settlement gains of $2 million for both the three months ended MarchB 31, 2015 and 2014. Also includes reimbursements primarily related to pressure testing and repairs and maintenance costs pursuant to the Amended Omnibus Agreement of $6 million and $5 million for the three months ended MarchB 31, 2015 and 2014, respectively.
[4]	This distribution was declared on April 22, 2015 and will be paid on the date of distribution.

Net_Income_Per_Unit_Details

Net Income Per Unit (Details) (USD $)	0 Months Ended	3 Months Ended
In Millions, except Share data, unless otherwise specified	16-May-14	Mar. 31, 2015		Mar. 31, 2014
Net Income Per Unit
Net income		$74		$42	[1]
Net income attributable to noncontrolling interest		-10		0
Net income, excluding noncontrolling interest		64	[2]	42	[2]
Limited partners' distributions		56		32
Allocation of distributions less (greater) than earnings		-6		3
Weighted average limited partner units outstanding:
Common units - basic		80,250,208		39,186,006
Common unit equivalents		31,780		98,382
Common units - diluted		80,281,988		39,284,388
Subordinated units - basic and diluted		0	[3]	15,254,890	[3]
Net income per limited partner unit:
Common - basic and diluted		$0.63		$0.64
Subordinated - basic and diluted		$0		$0.64
Footnote
General partner's ownership interest		2.00%		2.00%
Maximum percentage distribution to general partner		50.00%		50.00%
Minimum distribution level for IDRs (dollars per unit)		$0.39		$0.39
Subordinated units effective conversion date	16-May-14
General Partner
Net Income Per Unit
Net income		14
General partner's distributions (including IDRs)		14	[4]	7	[4]
Allocation of distributions less (greater) than earnings		0	[2]	1	[2]
Total partner's earnings		14		8
Limited Partner, common units
Net Income Per Unit
Net income		50
Limited partners' distributions		56		23
Allocation of distributions less (greater) than earnings		-6		1
Total partner's earnings		50		24
Limited Partner, subordinated units
Net Income Per Unit
Limited partners' distributions		0	[3]	9	[3]
Allocation of distributions less (greater) than earnings		0	[3]	1	[3]
Total partner's earnings		0	[3]	10	[3]
Rockies Natural Gas Business Acquisition
Footnote
General partner distribution amount forfeited		$2.50
[1]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[2]	In April 2015, the FASB ratified an EITF consensus on Issue 14-A concerning historical earnings per unit for master limited partnership drop down transactions. We have revised the historical allocation of general partner earnings to include the Predecessor loss TLLP incurred during the three months ended March 31, 2014. See Note 1 for additional information on the new guidance.
[3]	On MayB 16, 2014, the subordinated units were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. Distributions and the Partnershipbs net income were allocated to the subordinated units through MayB 15, 2014.
[4]	General partnerbs distributions (including IDRs) consist of an approximate 2% general partner interest and IDRs, which entitle the general partner to receive increasing percentages, up to 50%, of quarterly distributions in excess of $0.388125 per unit per quarter. The amount above reflects earnings distributed to our general partner (including IDRs) net of $2.5 million in IDRs waived by TLGP in connection with the Rockies Natural Gas Business Acquisition. See Note 12 of our Annual Report on Form 10-K for the year ended DecemberB 31, 2014, for further discussion related to IDRs.

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Property, Plant and Equipment
Gross Property, Plant and Equipment	$3,617	$3,551
Accumulated depreciation	-282	-245
Net Property, Plant and Equipment	3,335	3,306	[1]
Gathering
Property, Plant and Equipment
Gross Property, Plant and Equipment	1,558	1,507
Processing
Property, Plant and Equipment
Gross Property, Plant and Equipment	541	539
Terminalling and Transportation
Property, Plant and Equipment
Gross Property, Plant and Equipment	1,492	1,478
Other
Property, Plant and Equipment
Gross Property, Plant and Equipment	26	27
Green River Processing, LLC
Property, Plant and Equipment
Gross Property, Plant and Equipment	317	317
Accumulated depreciation	-41	-39
Net Property, Plant and Equipment	$276	$278
[1]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.

Debt_Total_Details

Debt, Total (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Debt Instrument
Total Debt	$2,563	[1]	$2,588	[1]
Unamortized issuance costs	-43		-44
Current maturities	0		0
Debt, net of current maturities and unamortized issuance costs	2,520		2,544	[2]
5.875% Senior Notes due 2020
Debt Instrument
Debt Instrument, unamortized premium	$4		$5
[1]	Includes unamortized premium of $4 million and $5 million as of MarchB 31, 2015 and DecemberB 31, 2014, respectively.
[2]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.

Debt_Revolving_Credit_Facility

Debt, Revolving Credit Facility(Details) (Revolving Credit Facility, USD $)	3 Months Ended
	Mar. 31, 2015
Revolving Credit Facility
Total loan availability	$900,000,000
Maximum loan availability	1,500,000,000
Borrowings under Revolving Credit Facility	235,000,000
Unused loan availability	$665,000,000
Unused loan availability, percentage	74.00%
Weighted average interest rate	2.67%
Revolver maturity date	2-Dec-19
Commitment Fee (unused portion)	0.50%	[1]
Line of Credit Facility, Collateral	Our Revolving Credit Facility is non-recourse to Tesoro, except for TLGP, and is guaranteed by all of our consolidated subsidiaries, with the exception of Rendezvous Gas Services L.L.C., and secured by substantially all of our assets.
Eurodollar
Revolving Credit Facility
Reference Rate Percent	0.18%	[1]
Eurodollar or Base Rate Margin	2.50%	[1]
Base Rate
Revolving Credit Facility
Reference Rate Percent	3.25%	[1]
Eurodollar or Base Rate Margin	1.50%	[1]
[1]	We have the option to elect if the borrowings will bear interest at either a base rate plus the base rate margin, or a Eurodollar rate, for the applicable period, plus the Eurodollar margin at the time of the borrowing. The applicable margin varies based upon a certain leverage ratio, as defined by the Revolving Credit Facility. We also incur commitment fees for the unused portion of the Revolving Credit Facility at an annual rate. Letters of credit outstanding under the Revolving Credit Facility incur fees at the Eurodollar margin rate.

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	3 Months Ended	0 Months Ended					15 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 18, 2013	Mar. 06, 2015	Mar. 22, 2013	Apr. 11, 2013	1-May-12	Mar. 31, 2015	Jan. 30, 2014	Dec. 31, 2014
Changes in Environmental Liabilities
Accruals for environmental expenditures	$28						$28		$32
Tioga Crude Oil Pipeline Release
Changes in Environmental Liabilities
Expenditures	-4
Insurance settlements receivable	16						16		18
Environmental liability insurance deductible	1						1
Environmental liabilities insurance coverage limit	25
Excess remediation costs over loss limit	-17
Proceeds from insurance settlement	9
Chevron Corrective Action Order
Changes in Environmental Liabilities
Diesel fuel release, period of occurrence		18-Mar-13
PHMSA | Chevron Corrective Action Order
Changes in Environmental Liabilities
Regulatory action issuance date				22-Mar-13
Regulatory action closure date			6-Mar-15
Department Of Environmental Quality Division Of Water | Chevron Corrective Action Order
Changes in Environmental Liabilities
Regulatory action issuance date					11-Apr-13
Northwest Products System
Changes in Environmental Liabilities
Accruals for environmental expenditures	6						6		6
Questar Gas Company v. QEP Field Services Company
Changes in Environmental Liabilities
Complaint filing date						1-May-12
Disputed amount netted from gathering fees							15
Liability for estimated damages									$21
XTO Energy Inc. v. QEP Field Services Company
Changes in Environmental Liabilities
Complaint filing date								30-Jan-14

Equity_Equity_ATM_Program_Deta

Equity Equity, ATM Program (Details) (USD $)	0 Months Ended	3 Months Ended
In Millions, except Share data, unless otherwise specified	Jun. 25, 2014	Mar. 31, 2015	Jun. 25, 2014
Issuance of units under ATM Program		446,499
Equity offering under ATM Program, net of issuance costs		$24
ATM Program
ATM Program, filing date	25-Jun-14
Common Units Aggregate Value	200		200
Issuance of units under ATM Program		446,499
Equity offering under ATM Program, net of issuance costs		$24

Equity_Units_Rollforward_Detai

Equity, Units Rollforward (Details) (USD $)	3 Months Ended			0 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Jun. 25, 2014	Dec. 31, 2014
Common units outstanding (units)	80,605,673				80,125,930
General partner units outstanding (units)	1,631,448				1,631,448
General partner's ownership interest	2.00%		2.00%
Issuance of units under ATM Program	446,499
Equity offering, net of issuance costs, ATM Program	$24
Changes in Units Outstanding
Balance at December 31, 2014	81,757,378
Issuance of units under ATM Program	446,499
Unit-based compensation awards	33,244	[1]
Balance at March 31, 2015	82,237,121
Tesoro
Tesoro's ownership interest	36.00%
Common
Issuance of units under ATM Program	446,499
Equity offering, net of issuance costs, ATM Program	24
Changes in Units Outstanding
Balance at December 31, 2014	80,125,930
Issuance of units under ATM Program	446,499
Unit-based compensation awards	33,244	[1]
Balance at March 31, 2015	80,605,673
Equity-based compensation units withheld for taxes (units)	13,233
Public common units
Common units outstanding (units)	52,423,925
Tesoro common units
Common units outstanding (units)	28,181,748
General Partner
General partner units outstanding (units)	1,631,448
Issuance of units under ATM Program	0
Equity offering, net of issuance costs, ATM Program	0
Changes in Units Outstanding
Balance at December 31, 2014	1,631,448
Issuance of units under ATM Program	0
Unit-based compensation awards	0	[1]
Balance at March 31, 2015	1,631,448
ATM Program
ATM Program, filing date				25-Jun-14
Issuance of units under ATM Program	446,499
Equity offering, net of issuance costs, ATM Program	$24
Changes in Units Outstanding
Issuance of units under ATM Program	446,499
[1]	Unit-based compensation awards are presented net of 13,233 units withheld for taxes.

Equity_Equity_Activity_Details

Equity, Equity Activity (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Changes in carrying amount of Equity
Balance at December 31, 2014	$1,890
Equity offering under ATM Program, net of issuance costs	24
Distributions	-79	[1]
Net income	74		42	[2]
Contributions	5	[3]
Other	1
Balance at March 31, 2015	1,915
Common
Changes in carrying amount of Equity
Balance at December 31, 2014	1,474
Equity offering under ATM Program, net of issuance costs	24
Distributions	-54	[1]
Net income	50
Contributions	5	[3]
Other	1
Balance at March 31, 2015	1,500
General Partner
Changes in carrying amount of Equity
Balance at December 31, 2014	-19
Equity offering under ATM Program, net of issuance costs	0
Distributions	-16	[1]
Net income	14
Contributions	0	[3]
Other	0
Balance at March 31, 2015	-21
Noncontrolling Interest
Changes in carrying amount of Equity
Balance at December 31, 2014	435
Equity offering under ATM Program, net of issuance costs	0
Distributions	-9	[1]
Net income	10
Contributions	0	[3]
Other	0
Balance at March 31, 2015	436
Green River Processing, LLC
Changes in carrying amount of Equity
Balance at December 31, 2014	280
Distributions	-17
Net income	10		14
Contributions	6
Balance at March 31, 2015	279
Green River Processing, LLC | QEPFS
Changes in carrying amount of Equity
Balance at December 31, 2014	168
Distributions	-10
Net income	6
Contributions	4
Balance at March 31, 2015	168
Limited partnership ownership interest	60.00%
Green River Processing, LLC | QEP Midstream Operating, LLC
Changes in carrying amount of Equity
Balance at December 31, 2014	112
Distributions	-7
Net income	4
Contributions	2
Balance at March 31, 2015	$111
Ownership interest	40.00%
[1]	Represents cash distributions declared and paid during the period ended MarchB 31, 2015 relating to the fourth quarter of 2014.
[2]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[3]	Includes Tesoro and TLGP contributions to the Partnership primarily related to reimbursements for capital spending pursuant to the Amended Omnibus Agreement.

Equity_Allocations_of_Net_Inco

Equity, Allocations of Net Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Net income attributable to partners	$64		$43	[1]
Net income available to partners	51		37
General partner's ownership interest	2.00%		2.00%
Total general partner's interest in net income	-14		-7	[1]
General Partner
General partner's IDRs	-13	[2]	-6	[2]
General partner's allocated interest in net income	1		1
Total general partner's interest in net income	$14		$7
[1]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[2]	TLGP waived $2.5 million of their IDRbs in connection with the Rockies Natural Gas Business Acquisition for the three months ended March 31, 2015.

Equity_Cash_Distributions_Deta

Equity, Cash Distributions (Details) (USD $)	3 Months Ended			0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Apr. 22, 2015
Distribution Made to Member or Limited Partner
Quarterly Distribution Per Unit		$0.67
Total Cash Distribution including general partner IDRs	$70	$70	$39
Date of Distribution		13-Feb-15
Unitholders Record Date		2-Feb-15
Subsequent Event
Distribution Made to Member or Limited Partner
Quarterly Distribution Per Unit				$0.70	[1]
Total Cash Distribution including general partner IDRs				70	[1]
Date of Distribution				15-May-15	[1]
Unitholders Record Date				4-May-15	[1]
Declaration date				22-Apr-15
Rockies Natural Gas Business Acquisition
Distribution Made to Member or Limited Partner
General partner distribution amount forfeited	2.5
Annually | Rockies Natural Gas Business Acquisition
Distribution Made to Member or Limited Partner
General partner distribution amount forfeited	$10
[1]	This distribution was declared on April 22, 2015 and will be paid on the date of distribution.

Equity_Distributions_Earned_De

Equity, Distributions Earned (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014	Mar. 31, 2014
Distributions Earned by Limited or General Partners
Limited partners' distributions	$56			$32
Total Cash Distributions	70		70	39
General Partner
Distributions Earned by Limited or General Partners
General partner's distributions	1			1
General partner's IDRs	13	[1]		6	[1]
Total general partner's distributions	14	[2]		7	[2]
Common
Distributions Earned by Limited or General Partners
Limited partners' distributions	56			23
Subordinated
Distributions Earned by Limited or General Partners
Limited partners' distributions	$0	[3]		$9	[3]
[1]	TLGP waived $2.5 million of their IDRbs in connection with the Rockies Natural Gas Business Acquisition for the three months ended March 31, 2015.
[2]	General partnerbs distributions (including IDRs) consist of an approximate 2% general partner interest and IDRs, which entitle the general partner to receive increasing percentages, up to 50%, of quarterly distributions in excess of $0.388125 per unit per quarter. The amount above reflects earnings distributed to our general partner (including IDRs) net of $2.5 million in IDRs waived by TLGP in connection with the Rockies Natural Gas Business Acquisition. See Note 12 of our Annual Report on Form 10-K for the year ended DecemberB 31, 2014, for further discussion related to IDRs.
[3]	On MayB 16, 2014, the subordinated units were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. Distributions and the Partnershipbs net income were allocated to the subordinated units through MayB 15, 2014.

Segment_Disclosures_Narrative_

Segment Disclosures, Narrative Information (Details)	3 Months Ended
	Mar. 31, 2015
	segments
Segment Reporting Information
Number of operating segments (segments)	3
Segment reporting, foreign operations	We do not have any foreign operations.
Fractionation Facility
Segment Reporting Information
Number of assets (assets)	1
Gas Processing Complexes
Segment Reporting Information
Number of assets (assets)	2
Crude oil gathering systems
Segment Reporting Information
Number of assets (assets)	1
Regulated common carrier pipeline
Segment Reporting Information
Number of assets (assets)	1
Jet fuel pipeline
Segment Reporting Information
Number of assets (assets)	1
Refined Products Pipeline
Segment Reporting Information
Number of assets (assets)	1
Crude oil and refined products terminals and storage facilities
Segment Reporting Information
Number of assets (assets)	24
Marine terminals
Segment Reporting Information
Number of assets (assets)	4
Rail car unloading facility
Segment Reporting Information
Number of assets (assets)	1
Petroleum coke handling and storage facility
Segment Reporting Information
Number of assets (assets)	1
Pipelines which transport products and crude oil
Segment Reporting Information
Number of miles (miles)	140
Processing | Gas Processing Complexes
Segment Reporting Information
Number of assets (assets)	4

Segment_Disclosures_Results_De

Segment Disclosures, Results (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
REVENUES
Affiliate	$148	[1]	$111	[1],[2]
Third-party	115		16	[2]
Total Revenues	263		127	[2]
OPERATING INCOME
Segment Operating Income	120		64
Interest and financing costs, net	-37		-18	[2]
Equity in earnings of unconsolidated affiliates	3		0
NET INCOME	74		42	[2]
Segment Reporting Information, Additional Information
Capital Expenditures	66		26
Identifiable Assets	4,796				4,765	[3]
Gathering
REVENUES
Affiliate	26		23
Third-party	51		2
Total Revenues	77		25
OPERATING INCOME
Segment Operating Income	34		11
Segment Reporting Information, Additional Information
Capital Expenditures	51		18
Identifiable Assets	1,733				1,694
Processing
REVENUES
Affiliate	20		0
Third-party	47		0
Total Revenues	67		0
OPERATING INCOME
Segment Operating Income	24		0
Segment Reporting Information, Additional Information
Capital Expenditures	1		0
Identifiable Assets	1,653				1,612
Terminalling and Transportation
REVENUES
Affiliate	102		88
Third-party	17		14
Total Revenues	119		102
OPERATING INCOME
Segment Operating Income	62		53
Segment Reporting Information, Additional Information
Capital Expenditures	14		8
Identifiable Assets	1,353				1,352
Other
OPERATING INCOME
Unallocated general and administrative expenses	-12		-4
Interest and financing costs, net	-37		-18
Segment Reporting Information, Additional Information
Identifiable Assets	$57				$107
[1]	Tesoro accounted for 56% and 88% of our total revenues for the three months ended MarchB 31, 2015 and 2014, respectively.
[2]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[3]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information Condensed Consolidating Financial Information Narrative (Details)	3 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Percentage ownership of subsidiary guarantors	100.00%

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information Statement of Operations (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
REVENUES
Affiliate	$148	[1]	$111	[1],[2]
Third-party	115		16	[2]
Total Revenues	263		127	[2]
COSTS AND EXPENSES
Operating and maintenance expenses	94		52	[2]
Imbalance settlement gains and reimbursements from Tesoro	-8	[3]	-7	[2],[3]
General and administrative expenses	25		10	[2]
Depreciation and amortization expenses	44		16	[2]
Total Costs and Expenses	155		67	[2]
OPERATING INCOME (LOSS)	108		60	[2]
Interest and financing costs, net	-37		-18	[2]
Equity in earnings of unconsolidated affiliates	3		0
Equity in earnings of subsidiaries	0
NET INCOME	74		42	[2]
Loss attributable to Predecessors	0		1	[2]
Net income attributable to noncontrolling interest	-10		0
Net income attributable to partners	64		43	[2]
Parent
REVENUES
Affiliate	0
Third-party	0
Total Revenues	0
COSTS AND EXPENSES
Operating and maintenance expenses	0
Imbalance settlement gains and reimbursements from Tesoro	0
General and administrative expenses	6
Depreciation and amortization expenses	0
Total Costs and Expenses	6
OPERATING INCOME (LOSS)	-6
Interest and financing costs, net	-39
Equity in earnings of unconsolidated affiliates	0
Equity in earnings of subsidiaries	109
NET INCOME	64
Loss attributable to Predecessors	0
Net income attributable to noncontrolling interest	0
Net income attributable to partners	64
Guarantor Subsidiaries
REVENUES
Affiliate	137
Third-party	69
Total Revenues	206
COSTS AND EXPENSES
Operating and maintenance expenses	78
Imbalance settlement gains and reimbursements from Tesoro	-8
General and administrative expenses	13
Depreciation and amortization expenses	29
Total Costs and Expenses	112
OPERATING INCOME (LOSS)	94
Interest and financing costs, net	3
Equity in earnings of unconsolidated affiliates	1
Equity in earnings of subsidiaries	18
NET INCOME	116
Loss attributable to Predecessors	0
Net income attributable to noncontrolling interest	0
Net income attributable to partners	116
Non Wholly-owned Guarantors
REVENUES
Affiliate	13
Third-party	47
Total Revenues	60
COSTS AND EXPENSES
Operating and maintenance expenses	24
Imbalance settlement gains and reimbursements from Tesoro	0
General and administrative expenses	6
Depreciation and amortization expenses	7
Total Costs and Expenses	37
OPERATING INCOME (LOSS)	23
Interest and financing costs, net	-1
Equity in earnings of unconsolidated affiliates	2
Equity in earnings of subsidiaries	3
NET INCOME	27
Loss attributable to Predecessors	0
Net income attributable to noncontrolling interest	-9
Net income attributable to partners	18
Non-Guarantors
REVENUES
Affiliate	6
Third-party	1
Total Revenues	7
COSTS AND EXPENSES
Operating and maintenance expenses	0
Imbalance settlement gains and reimbursements from Tesoro	0
General and administrative expenses	0
Depreciation and amortization expenses	3
Total Costs and Expenses	3
OPERATING INCOME (LOSS)	4
Interest and financing costs, net	0
Equity in earnings of unconsolidated affiliates	0
Equity in earnings of subsidiaries	0
NET INCOME	4
Loss attributable to Predecessors	0
Net income attributable to noncontrolling interest	-1
Net income attributable to partners	3
Eliminations
REVENUES
Affiliate	-8
Third-party	-2
Total Revenues	-10
COSTS AND EXPENSES
Operating and maintenance expenses	-8
Imbalance settlement gains and reimbursements from Tesoro	0
General and administrative expenses	0
Depreciation and amortization expenses	5
Total Costs and Expenses	-3
OPERATING INCOME (LOSS)	-7
Interest and financing costs, net	0
Equity in earnings of unconsolidated affiliates	0
Equity in earnings of subsidiaries	-130
NET INCOME	-137
Loss attributable to Predecessors	0
Net income attributable to noncontrolling interest	0
Net income attributable to partners	($137)
[1]	Tesoro accounted for 56% and 88% of our total revenues for the three months ended MarchB 31, 2015 and 2014, respectively.
[2]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[3]	Includes imbalance settlement gains of $2 million for both the three months ended MarchB 31, 2015 and 2014. Also includes reimbursements primarily related to pressure testing and repairs and maintenance costs pursuant to the Amended Omnibus Agreement of $6 million and $5 million for the three months ended MarchB 31, 2015 and 2014, respectively.

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information Balance Sheet (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014		Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets
Cash and cash equivalents	$16	$19	[1]	$43	[2]	$23	[2]
Receivables, net
Trade	125	122	[1]
Affiliate	76	69	[1]
Other	16	18	[1]
Prepayments and other	4	7	[1]
Total Current Assets	237	235	[1]
Net property, plant and equipment	3,335	3,306	[1]
Intangibles	966	973	[1]
Goodwill	168	164	[1]
Investments in unconsolidated affiliates	59	57	[1]
Investments in subsidiaries	0	0	[1]
Long-term intercompany receivable	0	0	[1]
Other noncurrent assets	31	30	[1]
Total Assets	4,796	4,765	[1]
Accounts payable
Trade	112	126	[1]
Affiliate	68	53	[1]
Accrued interest and financing costs	62	28	[1]
Other current liabilities	57	79	[1]
Total Current Liabilities	299	286	[1]
Long-term intercompany payable	0	0	[1]
Other noncurrent liabilities	62	45	[1]
Debt, net of unamortized issuance costs	2,520	2,544	[1]
Equity - TLLP	1,479	1,455	[1]
Equity - Noncontrolling interest	436	435	[1]
Total Liabilities and Equity	4,796	4,765	[1]
Parent
Current Assets
Cash and cash equivalents	3	0	[1]
Receivables, net
Trade	0	0	[1]
Affiliate	5	3	[1]
Other	0	0	[1]
Prepayments and other	1	3	[1]
Total Current Assets	9	6	[1]
Net property, plant and equipment	0	1	[1]
Intangibles	0	0	[1]
Goodwill	0	0	[1]
Investments in unconsolidated affiliates	0	0	[1]
Investments in subsidiaries	4,465	4,348	[1]
Long-term intercompany receivable	0	0	[1]
Other noncurrent assets	1	0	[1]
Total Assets	4,475	4,355	[1]
Accounts payable
Trade	12	6	[1]
Affiliate	3	2	[1]
Accrued interest and financing costs	62	28	[1]
Other current liabilities	22	21	[1]
Total Current Liabilities	99	57	[1]
Long-term intercompany payable	384	307	[1]
Other noncurrent liabilities	0	0	[1]
Debt, net of unamortized issuance costs	2,513	2,536	[1]
Equity - TLLP	1,479	1,455	[1]
Equity - Noncontrolling interest	0	0	[1]
Total Liabilities and Equity	4,475	4,355	[1]
Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	3	-2	[1]
Receivables, net
Trade	94	93	[1]
Affiliate	67	59	[1]
Other	16	18	[1]
Prepayments and other	3	4	[1]
Total Current Assets	183	172	[1]
Net property, plant and equipment	2,114	2,073	[1]
Intangibles	585	590	[1]
Goodwill	76	48	[1]
Investments in unconsolidated affiliates	18	18	[1]
Investments in subsidiaries	1,327	1,325	[1]
Long-term intercompany receivable	565	516	[1]
Other noncurrent assets	30	30	[1]
Total Assets	4,898	4,772	[1]
Accounts payable
Trade	90	102	[1]
Affiliate	64	45	[1]
Accrued interest and financing costs	0	0	[1]
Other current liabilities	35	56	[1]
Total Current Liabilities	189	203	[1]
Long-term intercompany payable	0	0	[1]
Other noncurrent liabilities	41	25	[1]
Debt, net of unamortized issuance costs	7	8	[1]
Equity - TLLP	4,661	4,536	[1]
Equity - Noncontrolling interest	0	0	[1]
Total Liabilities and Equity	4,898	4,772	[1]
Non Wholly-owned Guarantors
Current Assets
Cash and cash equivalents	7	19	[1]
Receivables, net
Trade	31	28	[1]
Affiliate	22	7	[1]
Other	0	0	[1]
Prepayments and other	0	0	[1]
Total Current Assets	60	54	[1]
Net property, plant and equipment	561	566	[1]
Intangibles	0	0	[1]
Goodwill	0	0	[1]
Investments in unconsolidated affiliates	25	25	[1]
Investments in subsidiaries	150	152	[1]
Long-term intercompany receivable	0	0	[1]
Other noncurrent assets	0	0	[1]
Total Assets	796	797	[1]
Accounts payable
Trade	10	18	[1]
Affiliate	22	6	[1]
Accrued interest and financing costs	0	0	[1]
Other current liabilities	2	4	[1]
Total Current Liabilities	34	28	[1]
Long-term intercompany payable	204	214	[1]
Other noncurrent liabilities	29	29	[1]
Debt, net of unamortized issuance costs	0	0	[1]
Equity - TLLP	498	497	[1]
Equity - Noncontrolling interest	31	29	[1]
Total Liabilities and Equity	796	797	[1]
Non-Guarantors
Current Assets
Cash and cash equivalents	3	2	[1]
Receivables, net
Trade	0	1	[1]
Affiliate	3	0	[1]
Other	0	0	[1]
Prepayments and other	0	0	[1]
Total Current Assets	6	3	[1]
Net property, plant and equipment	185	188	[1]
Intangibles	0	0	[1]
Goodwill	0	0	[1]
Investments in unconsolidated affiliates	0	0	[1]
Investments in subsidiaries	0	0	[1]
Long-term intercompany receivable	2	5	[1]
Other noncurrent assets	0	0	[1]
Total Assets	193	196	[1]
Accounts payable
Trade	0	0	[1]
Affiliate	0	0	[1]
Accrued interest and financing costs	0	0	[1]
Other current liabilities	0	0	[1]
Total Current Liabilities	0	0	[1]
Long-term intercompany payable	0	0	[1]
Other noncurrent liabilities	1	1	[1]
Debt, net of unamortized issuance costs	0	0	[1]
Equity - TLLP	150	152	[1]
Equity - Noncontrolling interest	42	43	[1]
Total Liabilities and Equity	193	196	[1]
Eliminations
Current Assets
Cash and cash equivalents	0	0	[1]
Receivables, net
Trade	0	0	[1]
Affiliate	-21	0	[1]
Other	0	0	[1]
Prepayments and other	0	0	[1]
Total Current Assets	-21	0	[1]
Net property, plant and equipment	475	478	[1]
Intangibles	381	383	[1]
Goodwill	92	116	[1]
Investments in unconsolidated affiliates	16	14	[1]
Investments in subsidiaries	-5,942	-5,825	[1]
Long-term intercompany receivable	-567	-521	[1]
Other noncurrent assets	0	0	[1]
Total Assets	-5,566	-5,355	[1]
Accounts payable
Trade	0	0	[1]
Affiliate	-21	0	[1]
Accrued interest and financing costs	0	0	[1]
Other current liabilities	-2	-2	[1]
Total Current Liabilities	-23	-2	[1]
Long-term intercompany payable	-588	-521	[1]
Other noncurrent liabilities	-9	-10	[1]
Debt, net of unamortized issuance costs	0	0	[1]
Equity - TLLP	-5,309	-5,185	[1]
Equity - Noncontrolling interest	363	363	[1]
Total Liabilities and Equity	($5,566)	($5,355)	[1]
[1]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.
[2]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.

Condensed_Consolidating_Financ5

Condensed Consolidating Financial Information Statement of Cash Flows (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net cash from (used in) operating activities	$152		$69	[1]
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	-82
Investment in subsidiaries	0
Net cash used in investing activities	-82		-15	[1]
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	24
Quarterly distributions to unitholders	-54		-31	[1]
Quarterly distributions to general partner	-16		-5	[1]
Distributions to noncontrolling interest	-9		0	[1]
Distributions to subsidiaries	0
Borrowings under revolving credit agreement	99		0	[1]
Repayments under revolving credit agreement	-124		0	[1]
Contributions	0
Intercompany borrowings (payments)	0
Capital contributions by affiliate	7		1	[1]
Net cash used in financing activities	-73		-34	[1]
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-3		20	[1]
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	19	[2]	23	[1]
CASH AND CASH EQUIVALENTS, END OF PERIOD	16		43	[1]
Parent
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net cash from (used in) operating activities	-4
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	0
Investment in subsidiaries	-7
Net cash used in investing activities	-7
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	24
Quarterly distributions to unitholders	-54
Quarterly distributions to general partner	-16
Distributions to noncontrolling interest	0
Distributions to subsidiaries	0
Borrowings under revolving credit agreement	99
Repayments under revolving credit agreement	-124
Contributions	0
Intercompany borrowings (payments)	78
Capital contributions by affiliate	7
Net cash used in financing activities	14
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0	[2]
CASH AND CASH EQUIVALENTS, END OF PERIOD	3
Guarantor Subsidiaries
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net cash from (used in) operating activities	153
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	-79
Investment in subsidiaries	-3
Net cash used in investing activities	-82
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	0
Quarterly distributions to unitholders	0
Quarterly distributions to general partner	0
Distributions to noncontrolling interest	0
Distributions to subsidiaries	0
Borrowings under revolving credit agreement	-9
Repayments under revolving credit agreement	22
Contributions	7
Intercompany borrowings (payments)	-86
Capital contributions by affiliate	0
Net cash used in financing activities	-66
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	5
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	-2	[2]
CASH AND CASH EQUIVALENTS, END OF PERIOD	3
Non Wholly-owned Guarantors
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net cash from (used in) operating activities	25
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	-3
Investment in subsidiaries	0
Net cash used in investing activities	-3
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	0
Quarterly distributions to unitholders	-9
Quarterly distributions to general partner	-1
Distributions to noncontrolling interest	-7
Distributions to subsidiaries	-10
Borrowings under revolving credit agreement	9
Repayments under revolving credit agreement	-22
Contributions	3
Intercompany borrowings (payments)	3
Capital contributions by affiliate	0
Net cash used in financing activities	-34
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-12
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	19	[2]
CASH AND CASH EQUIVALENTS, END OF PERIOD	7
Non-Guarantors
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net cash from (used in) operating activities	5
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	0
Investment in subsidiaries	0
Net cash used in investing activities	0
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	0
Quarterly distributions to unitholders	0
Quarterly distributions to general partner	-5
Distributions to noncontrolling interest	-2
Distributions to subsidiaries	0
Borrowings under revolving credit agreement	0
Repayments under revolving credit agreement	0
Contributions	0
Intercompany borrowings (payments)	3
Capital contributions by affiliate	0
Net cash used in financing activities	-4
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2	[2]
CASH AND CASH EQUIVALENTS, END OF PERIOD	3
Eliminations
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net cash from (used in) operating activities	-27
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	0
Investment in subsidiaries	10
Net cash used in investing activities	10
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	0
Quarterly distributions to unitholders	9
Quarterly distributions to general partner	6
Distributions to noncontrolling interest	0
Distributions to subsidiaries	10
Borrowings under revolving credit agreement	0
Repayments under revolving credit agreement	0
Contributions	-10
Intercompany borrowings (payments)	2
Capital contributions by affiliate	0
Net cash used in financing activities	17
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0	[2]
CASH AND CASH EQUIVALENTS, END OF PERIOD	$0
[1]	Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.
[2]	Presentation of the condensed consolidating balance sheet as of December 31, 2014 has been adjusted to conform to the current period presentation.