Andeavor Logistics (ANDX) 10-Q 5 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 30, 2019
Document and Entity Information [Abstract]
Document Transition Report	false
Document Quarterly Report	true
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Entity File Number	001-35143
Entity Registrant Name	ANDEAVOR LOGISTICS LP
Entity Central Index Key	0001507615
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-4151603
Entity Address, Address Line One	200 East Hardin Street
Entity Address, City or Town	Findlay
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45840
City Area Code	419
Local Phone Number	421-2414
Title of 12(b) Security	Common Units Representing Limited Partnership Interests
Trading Symbol	-
Security Exchange Name	NONE
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		0

Condensed Statements of Consoli

Condensed Statements of Consolidated Operations (unaudited) Statement - USD ($) shares in Millions, $ in Millions		3 Months Ended					6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018		Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Revenues		$ 601		$ 569	[1],[2]		$ 1,231	$ 1,115	[1],[2]
Costs and Expenses:
NGL expense (excluding items shown separately below)		33		45	[2]		92	93	[2]
Operating expenses (excluding depreciation and amortization)		237		221	[2]		476	422	[2]
Depreciation and amortization expenses		104		93	[2]		205	182	[2],[3]
General and administrative expenses		18		29	[2]		38	60	[2]
Loss on asset disposals and impairments		2		1	[2]		2	1	[2],[3]
Operating Income		207		180	[1],[2]		418	357	[1],[2]
Interest and financing costs, net		(63)		(60)	[1],[2]		(124)	(115)	[1],[2]
Equity in earnings of equity method investments		9		10	[1],[2]		16	18	[1],[2]
Other income, net		7		2	[1],[2]		7	3	[1],[2]
Net Earnings		160		132	[1],[2],[4]		317	263	[1],[2],[3],[4]
Loss attributable to Predecessors		0		16	[2]	$ 8	0	24	[2]
Net Earnings Attributable to Partners		160	$ 157	148		$ 139	317	287
Preferred unitholders’ interest in net earnings		(10)		(10)			(20)	(24)
Limited Partners’ Interest in Net Earnings		$ 150		$ 138			$ 297	$ 263
Net earnings per limited partner unit:
Common - basic	[5]	$ 0.65		$ 0.63			$ 1.29	$ 1.23
Common - diluted	[5]	$ 0.65		$ 0.63			$ 1.29	$ 1.23
Weighted average limited partner units outstanding:
Common units - basic		245.6		217.2			245.6	217.2
Common units - diluted	[6]	245.7		217.3			245.7	217.3
Affiliated Entity
Revenues:
Revenues	[7]	$ 424		$ 389	[2],[8]		$ 868	$ 716	[2],[8]
Third Party
Revenues:
Revenues		$ 177		$ 180	[2]		$ 363	$ 399	[2]
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[5]	Amounts may not recalculate due to rounding of dollar and unit information.
[6]	Diluted net earnings per unit include the effects of potentially dilutive units on our common units, which consist of unvested phantom units.
[7]	Represents 71% and 68% of our total revenues for the three months ended June 30, 2019 and 2018 , respectively, and 71% and 64% of our total revenues for the six months ended June 30, 2019 and 2018 , respectively.
[8]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 25	$ 10
Receivables, net of allowance for doubtful accounts
Trade and other	202	195
Affiliate	323	279
Prepayments and other current assets	65	79
Total Current Assets	615	563
Property, Plant and Equipment, Net
Property, plant and equipment, at cost	8,409	8,145
Accumulated depreciation	(1,480)	(1,300)
Property, Plant and Equipment, Net	6,929	6,845
Acquired Intangibles, Net	1,079	1,104
Goodwill	1,051	1,051
Equity Method Investments	605	602
Other Noncurrent Assets, Net	271	130
Total Assets	10,550	10,295
Accounts payable
Trade and other	196	214
Affiliate	277	252
Accrued interest and financing costs	41	41
Current maturities of debt	503	504
Other current liabilities	93	81
Total Current Liabilities	1,110	1,092
Debt, Net of Unamortized Issuance Costs	4,720	4,460
Other Noncurrent Liabilities	186	69
Total Liabilities	6,016	5,621
Commitments and Contingencies (Note 6)
Equity
Preferred unitholders; 600,000 units issued and outstanding in 2019 and 2018	603
Common unitholders; 245,630,444 units issued and outstanding (245,493,184 in 2018)	3,931
Total Equity	4,534	4,674
Total Liabilities and Equity	$ 10,550	$ 10,295

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited), (Parenthetical) - shares	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Statement of Financial Position [Abstract]
Limited Partners' Capital Account, Units Outstanding	245,630,444	245,493,184	245,000,000
Preferred Units, Outstanding	600,000	600,000

Condensed Statements of Conso_2

Condensed Statements of Consolidated Cash Flows (unaudited) Condensed Statements of Consolidated Cash Flows (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From (Used In) Operating Activities:
Net earnings	$ 317	$ 263	[1],[2],[3],[4]
Adjustments to reconcile net earnings to net cash from operating activities:
Depreciation and amortization expenses	205	182	[3],[4]
Loss on asset disposals and impairments	2	1	[3],[4]
Other operating activities	18	12	[4]
Changes in current assets and liabilities	(45)	100	[4]
Changes in noncurrent assets and liabilities	(14)	(11)	[4]
Net cash from operating activities	483	547	[4]
Cash Flows Used In Investing Activities:
Capital expenditures	(252)	(370)	[4]
Acquisitions, net of cash	0	(378)	[4]
Contributions to equity method investments	(13)	0
Net cash used in investing activities	(265)	(748)	[4]
Cash Flows From (Used In) Financing Activities:
Borrowings under revolving credit agreements	1,631	520	[4]
Repayments under revolving credit agreements	(1,376)	(278)	[4]
Distributions to common unitholders	(480)	(411)	[4]
Distributions to preferred unitholders	(21)	(8)	[4]
Sponsor contributions of equity to the Predecessors	0	336	[4]
Capital contributions by affiliate	45	14	[4]
Other financing activities	(2)	(3)	[4]
Net cash (used in) from financing activities	(203)	170	[4]
Increase (Decrease) in Cash and Cash Equivalents	15	(31)	[4]
Cash and Cash Equivalents, Beginning of Period	10	75
Cash and Cash Equivalents, End of Period	$ 25	$ 44
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Organization and Basis of Prese

Organization and Basis of Presentation (Notes)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization Andeavor Logistics LP (“Andeavor Logistics”) is a fee-based, full-service, diversified Delaware limited partnership formed in December 2010 by Andeavor and its wholly-owned subsidiary, Tesoro Logistics GP, LLC (“TLGP”), to own, operate, develop and acquire logistics and related assets and businesses. TLGP served as our general partner until the closing of the MPLX Merger on July 30, 2019, as described below. Effective upon the closing of the MPLX Merger, our general partner is Andeavor Logistics GP LLC (“ALGP”), a wholly-owned subsidiary of MPLX LP (“MPLX”). Unless the context otherwise requires, references in this report to our general partner refer to TLGP for all activity through the closing of the MPLX Merger and to ALGP for all activity thereafter. Unless the context otherwise requires, references in this report to “we,” “us,” “our,” or “ours” refer to Andeavor Logistics, one or more of its consolidated subsidiaries or all of them taken as a whole. Unless the context otherwise requires, references in this report to “Andeavor” or our “Sponsor” refer collectively to Andeavor for all activity through September 30, 2018, or Andeavor LLC, successor-by-merger to Andeavor effective October 1, 2018 and a wholly owned subsidiary of Marathon Petroleum Corporation, and any of Andeavor’s or Andeavor LLC’s subsidiaries, as applicable, other than Andeavor Logistics, its subsidiaries and its general partner. References in this report to “Marathon” or “MPC” refer to Marathon Petroleum Corporation, one or more of its consolidated subsidiaries, including Andeavor LLC, or all of them taken as a whole. MPLX LP Merger As previously disclosed, on May 7, 2019, Andeavor Logistics, TLGP, MPLX, MPLX GP LLC, and MPLX MAX LLC, a wholly-owned subsidiary of MPLX (“Merger Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) that provided for, among other things, the merger of Merger Sub with and into Andeavor Logistics (the “MPLX Merger”). On July 30, 2019, the MPLX Merger was completed, and Andeavor Logistics survived the MPLX Merger as a wholly-owned subsidiary of MPLX. At the effective time of the MPLX Merger, each common unit held by our public unitholders was converted into the right to receive 1.135 common units representing limited partner interests in MPLX (“MPLX Common Units”). Andeavor Logistics common units held by TLGP and Western Refining Southwest, Inc. (“WR Southwest”) were converted into the right to receive 1.0328 MPLX Common Units. In connection with the completion of the MPLX Merger, we notified the New York Stock Exchange (“NYSE”) that each of our outstanding common units was converted into the right to receive MPLX Common Units in an amount determined by reference to the applicable exchange ratio. Upon our request, the NYSE filed a notification of removal from listing on Form 25 with the Securities and Exchange Commission (the “SEC”) with respect to our common units. Our common units ceased being traded prior to the opening of the market on July 30, 2019, and will no longer be listed on the NYSE. We continue to file with the SEC current and period reports that would be required by be filed with the SEC pursuant to Section 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). MPC Merger On October 1, 2018, MPC completed its acquisition of Andeavor (the “MPC Merger”) in accordance with the Agreement and Plan of Merger, dated as of April 29, 2018, as amended. Following the MPC Merger, MPC became the beneficial owner of 156 million common units out of 245 million common units outstanding as of October 1, 2018, which represented a 64% limited partner interest. MPC also acquired 100% of the equity interests of our general partner. Principles of Consolidation and Basis of Presentation Principles of Consolidation Assets acquired from our Sponsor, and the associated liabilities and results of operations, are collectively referred to as the “Predecessors.” See Note 1 of our Annual Report on Form 10-K for the year ended December 31, 2018 and Note 2 for additional information regarding the assets acquired from our Sponsor. 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. On August 6, 2018, we acquired assets from our Sponsor (the “2018 Drop Down”). See Note 2 for additional information. As an entity under common control with our Sponsor, we record the assets that we acquire from our Sponsor on our condensed consolidated balance sheet at our Sponsor’s historical basis instead of fair value. Accordingly, the accompanying financial statements and related notes of Andeavor Logistics have been retrospectively adjusted to include the historical results of the assets acquired prior to the effective date of the acquisition. The financial statements of our Predecessors have been prepared from the separate records maintained by our Sponsor and may not necessarily be indicative of the conditions that would have existed or the results of operations if our Predecessors had been operated as an unaffiliated entity. For the six months ended June 30, 2018 , our condensed statement of cash flows includes net cash from operating activities of $86 million and net cash used in investing activities of $422 million from our Predecessors, offset by sponsor contributions of equity to the Predecessors in net cash from financing activities. The interim condensed consolidated financial statements and notes thereto have been prepared by management without audit according to the rules and regulations of the 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. Basis of Presentation We prepare our condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). However, certain information and notes normally included in financial statements prepared under U.S. GAAP have been condensed or omitted pursuant to the SEC’s rules and regulations. Management believes that the disclosures presented herein are adequate to present the information fairly. The accompanying interim condensed consolidated financial statements and notes should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2018 . Certain prior year balances have been aggregated or disaggregated in order to conform to the current year presentation. We are required under U.S. GAAP 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. Our results of operations for any interim period are not necessarily indicative of results for the full year. Cost Classifications Natural gas liquids (“NGL”) expense results from the cost of NGL purchases under our percent of proceeds (“POP”) arrangements as well as the non-cash acquisition of replacement dry gas under our keep-whole arrangements. Operating expenses are comprised of direct operating costs, including costs incurred for direct labor, repairs and maintenance, outside services, chemicals and catalysts, utility costs, including the purchase of electricity and natural gas used by our facilities, property taxes, environmental compliance costs related to current period operations, rent expense and other direct operating expenses incurred in the provision of services. Depreciation and amortization expenses consist of the depreciation and amortization of property, plant and equipment, deferred charges and intangible assets related to our operating segments along with our corporate operations. General and administrative expenses represent costs that are not directly or indirectly related to or otherwise are not allocated to our operations. NGL expense, direct operating expenses, and depreciation and amortization expenses recognized by our Terminalling and Transportation, Gathering and Processing, and Wholesale segments (refer to amounts disclosed in Note 10 ) constitute costs of revenue as defined by U.S. GAAP. Financial Instruments 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”), our dropdown credit facility (“Dropdown Credit Facility”) and our loan agreement with MPC (the “MPC Loan Agreement”), which include a variable interest rate, approximate fair value. The carrying value and fair value of our debt were $5.3 billion and $5.4 billion as of June 30, 2019 , respectively, and were $5.0 billion and $4.9 billion at December 31, 2018 , respectively. These carrying and fair values of our debt exclude unamortized issuance costs, which are netted against our total debt. We believe the carrying value of our other financial instruments, including cash and cash equivalents, receivables, accounts payable and certain accrued liabilities, approximate fair value. Our fair value assessment incorporates a variety of considerations, including the short-term duration of the instruments and the expected future insignificance of bad debt expense, which includes an evaluation of counterparty credit risk. New Accounting Standards and Disclosures Leases We adopted Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842)” (“ASC 842”), as of January 1, 2019, using the optional transition method. The optional transition method permits entities to adopt the provisions of ASC 842 prospectively without adjusting comparative periods, which we have elected. As part of the adoption of ASC 842, we elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to grandfather the historical accounting conclusions until a reassessment event is present. We have also elected the practical expedient to not recognize short-term leases on the balance sheet, and the practical expedient related to right of way permits and land easements, allowing us to carry forward our accounting treatment for those existing agreements. Further, we have elected the practical expedient to not separate lease and non-lease components for the majority of our underlying classes of assets except for our third-party contractor service and equipment agreements in which we are the lessee. We did not elect the practical expedient to combine lease and non-lease components for arrangements in which we are the lessor. In instances where the practical expedient was not elected, lease and non-lease consideration is allocated based on relative standalone selling price. Right of use assets represent our right to use an underlying asset in which we obtain substantially all of the economic benefits and convey the right to control during the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease right of use assets and lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Payments that are not fixed at the commencement date are considered variable and are excluded from the right of use asset and lease liability calculated. We recognized right of use assets and lease liabilities on the balance sheet for leases with a lease term of greater than one year. In the measurement of our right of use assets and lease liabilities, the fixed minimum lease payments in the agreement are discounted using a secured incremental borrowing rate provided by our financial service providers, as most of our leases do not provide an implicit rate, for a term similar to the duration of the lease. Operating lease expense is recognized on a straight-line basis over the lease term. Adoption of the new standard resulted in the recording of additional right of use lease assets and lease liabilities of $131 million and $133 million , respectively, as of January 1, 2019, as further described in Note 4 . The standard did not materially impact our condensed statements of consolidated operations or condensed statements of consolidated cash flows. As a lessor under ASC 842, we may be required to re-classify existing contracts or operating leases to sales-type leases upon modification and reassessment of the contract. If such a modification were to occur, it may result in the de-recognition of existing assets, recognition of a receivable in the amount of the present value of fixed payments expected to be received by us under the contract, and recognition of a corresponding gain or loss in the period of change. We will evaluate the impact of a reassessment as modifications occur. Stock Compensation In June 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-07, “Improvements to Nonemployee Share-Based Payment Accounting”, which expanded the scope of Topic 718 to include share-based payment awards to nonemployees and eliminated the classification differences for employee and nonemployee share-based payment awards. This guidance was effective for interim and annual periods beginning after December 15, 2018. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. Credit Losses In June 2016, the FASB issued ASU 2016-13, “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”), which amends guidance on the impairment of financial instruments. The ASU requires the estimation of credit losses based on expected losses and provides for a simplified accounting model for purchased financial assets with credit deterioration. In November 2018, the FASB issued ASU 2018-19, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses” that clarifies the scope of ASU 2016-13. In May 2019, the FASB issued ASU 2019-05, “Financial Instruments - Credit Losses (Topic 326) Targeted Transition Relief” to allow companies to irrevocably elect the fair value option on financial instruments that were previously recorded at amortized cost for eligible instruments . These ASUs are effective for annual reporting periods beginning after December 15, 2019, and interim reporting periods within those annual reporting periods. Early adoption is permitted for annual reporting periods beginning after December 15, 2018. While we are still evaluating the impact of ASU 2016-13, we do not expect to early adopt ASU 2016-13 nor expect the adoption of this standard to have a material impact on our consolidated financial statements.

Acquisitions Acquisitions (Note

Acquisitions Acquisitions (Notes)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions 2018 Drop Down On August 6, 2018, we completed the 2018 Drop Down for total consideration of $1.55 billion . These assets include gathering, storage and transportation assets in the Permian Basin; legacy Western Refining, Inc. assets and associated crude terminals; the majority of Andeavor’s remaining refining terminalling, transportation and storage assets; and equity method investments in Andeavor Logistics Rio Pipeline LLC (“ALRP”), Minnesota Pipe Line Company, LLC, and PNAC, LLC (“PNAC”). In addition, the Conan Crude Oil Gathering System and the Los Angeles Refinery Interconnect Pipeline (“LARIP”) were transferred at cost plus incurred interest. SLC Core Pipeline System On May 1, 2018 , we completed our acquisition of the SLC Core Pipeline System from Plains All American Pipeline, L.P. for total consideration of $180 million . The system consists of pipelines that transport crude oil to another third-party pipeline system that supplies Salt Lake City area refineries, including Marathon’s Salt Lake City refinery. We financed the acquisition using our Revolving Credit Facility. This acquisition is not material to our condensed consolidated financial statements and its operating results are reported in our Terminalling and Transportation segment. Combined Consolidated Financial Information As discussed further in Note 1, we refer to the historical results of the assets acquired from our Sponsor in the 2018 Drop Down (prior to August 6, 2018) as our “Predecessors.” The following table presents our results of operations disaggregated to present results relating to us and the Predecessors for the assets acquired from our Sponsor and the total amounts included in our combined financial statements for the three and six months ended June 30, 2018 . Reconciliation of Combined Financial Statements (in millions) Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Combined Andeavor Logistics Predecessors Combined Andeavor Logistics Predecessors Revenues Affiliate $ 389 $ 381 $ 8 $ 716 $ 699 $ 17 Third-party 180 176 4 399 393 6 Total Revenues 569 557 12 1,115 1,092 23 Costs and Expenses NGL expense (exclusive of items shown separately below) 45 45 — 93 93 — Operating expenses (exclusive of depreciation and amortization) 221 201 20 422 391 31 Depreciation and amortization expenses 93 83 10 182 163 19 General and administrative expenses 29 25 4 60 52 8 Loss on asset disposals and impairments 1 1 — 1 1 — Operating Income (Loss) 180 202 (22 ) 357 392 (35 ) Interest and financing costs, net (60 ) (58 ) (2 ) (115 ) (112 ) (3 ) Equity in earnings of equity method investments 10 3 7 18 5 13 Other income, net 2 1 1 3 2 1 Net Earnings (Loss) $ 132 $ 148 $ (16 ) $ 263 $ 287 $ (24 ) Loss attributable to Predecessors $ 16 $ — $ 16 $ 24 $ — $ 24 Net Earnings Attributable to Partners 148 148 — 287 287 — Preferred unitholders’ interest in net earnings (10 ) (10 ) — (24 ) (24 ) — Limited Partners’ Interest in Net Earnings $ 138 $ 138 $ — $ 263 $ 263 $ —

Related-Party Transactions Rela

Related-Party Transactions Related-Party Transactions (Notes)	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related-Party Transactions Affiliate Agreements We have various long-term, fee-based commercial agreements with our Sponsor, under which we provide terminal distribution, storage services, pipeline transportation, crude oil, natural gas and produced water gathering and processing, wholesale, and trucking services to Marathon, and Marathon commits to provide us with minimum monthly throughput volumes of crude oil, refined products and other products. If, in any calendar month, Marathon fails to meet its minimum volume commitments under these agreements, it will be required to pay us a shortfall payment. For the NGLs that we handle under keep-whole agreements, we transfer the commodity price risk exposure associated with these keep-whole agreements to Marathon pursuant to the Keep-Whole Commodity Fee Agreement, as amended (the “Keep-Whole Commodity Agreement”). Under the Keep-Whole Commodity Agreement, Marathon pays us a processing fee for NGLs related to the keep-whole agreements and delivers replacement dry gas to the producers on our behalf. We then pay Marathon a marketing fee in exchange for assuming the commodity price risk. The terms and pricing of this agreement are subject to revision each year. We have agreements for the provision of various general and administrative services by our Sponsor. Under our partnership agreement, we are required to reimburse our general partner and its affiliates for all costs and expenses they incur on our behalf for managing and controlling our business and operations. On January 30, 2019, TLGP and certain of its indirect subsidiaries entered into a secondment agreement between us and certain of our subsidiaries and Marathon Petroleum Logistics Services LLC (“MPLS”) and a secondment agreement between us and certain of our subsidiaries and Marathon Refining Logistics Services LLC (“MRLS”) (collectively, the “2019 Secondment Agreements”). Under the 2019 Secondment Agreements, MPLS and MRLS second certain employees to occupy positions within our business and organization and to conduct business on our behalf. While seconded by MPLS and MRLS to us, seconded employees remain on the payroll of MPLS or MRLS, as the case may be, and are eligible to participate in all MPLS or MRLS benefit plans that they would be eligible to participate in absent the secondment, but work for and are under our general direction, supervision and control. We reimburse MPLS or MRLS, as the case may be, for the payroll costs of the seconded employees, including base pay, bonuses and other incentive compensation plus a burden rate associated with benefits and other payroll costs for the portion of the employee’s time that is allocated to us. The 2019 Secondment Agreements are for a term of 10 years, but may be sooner terminated by us, MPLS or MRLS upon 60 days written notice. In connection with the entry into the 2019 Secondment Agreements, on January 30, 2019, our Sponsor entered into an agreement (the “Termination Agreement”) that terminated the Andeavor Secondment Agreement. The Termination Agreement had an effective date of January 1, 2019. Except to the extent specified under our amended omnibus agreement (the “Amended Omnibus Agreement”) or the 2019 Secondment Agreements, TLGP determines the amount of these expenses. Under the terms of the Amended Omnibus Agreement in effect as of June 30, 2019 , we are required to pay our Sponsor an annual corporate services fee of $17 million for the provision of various centralized corporate services, including executive management, legal, accounting, treasury, human resources, health, safety and environmental, information technology, certain insurance coverage, administration and other corporate services. Pursuant to the applicable secondment agreements in effect, our Sponsor charged us $24 million and $4 million during the three months ended June 30, 2019 and 2018 , respectively, and $47 million and $10 million during the six months ended June 30, 2019 and 2018 , respectively, reflecting increased services provided in conjunction with the assets acquired in the 2018 Drop Down. Additionally, pursuant to the Amended Omnibus Agreement and 2019 Secondment Agreements, we reimburse our Sponsor for any direct costs incurred by our Sponsor in providing other operational services with respect to certain of our other assets and operations. Summary of Affiliate Transactions Summary of Revenue and Expense Transactions with our Sponsor (in millions) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Revenues (b) $ 424 $ 389 $ 868 $ 716 Operating expenses (c) 113 72 217 134 General and administrative expenses 15 22 29 46 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. (b) Represents 71% and 68% of our total revenues for the three months ended June 30, 2019 and 2018 , respectively, and 71% and 64% of our total revenues for the six months ended June 30, 2019 and 2018 , respectively. (c) Excludes reimbursements from our Sponsor pursuant to the Amended Omnibus Agreement, the Carson Assets Indemnity Agreement and other affiliate agreements of $7 million and $3 million for the three months ended June 30, 2019 and 2018 , respectively, and $10 million for both the six months ended June 30, 2019 and 2018 . Distributions During the six months ended June 30, 2019 , we paid quarterly cash distributions of $294 million to our Sponsor. See Note 7 for further information regarding distributions.

Leases (Notes)

Leases (Notes)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases For further information regarding the adoption of ASC 842, including the method of adoption and practical expedients elected, see Note 1. Lessee We lease a wide variety of facilities and equipment under operating leases, including land and building space, office and field equipment, storage facilities and transportation equipment with remaining lease terms ranging from less than 1 year to 25 years. Some of our long-term leases include renewal options. Renewal options and termination options were not included in the measurement of right of use assets and lease liabilities since it was determined they were not reasonably certain to be exercised. The decision to renew or terminate the lease is at our sole discretion. Our lease agreements do not include any material residual value guarantees or restrictive covenants. Maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining noncancellable lease terms in excess of one year as of June 30, 2019 as well as the components of lease expense under ASC 842 are as follows: Lease Liabilities Maturities (in millions) Lease Obligations Operating Finance 2019 $ 6 $ 2 2020 18 3 2021 15 2 2022 12 2 2023 12 2 2024 and thereafter 102 4 Gross lease payments 165 15 Less: imputed interest (45 ) (2 ) Total Lease Payments $ 120 $ 13 Components of Lease Expense (in millions) Three Months Ended June 30, 2019 Six Months Ended June 30 , 2019 Operating lease cost $ 5 $ 8 Finance lease cost: Amortization of right-of-use assets 1 2 Interest on lease liabilities 1 1 Total finance lease cost 2 3 Variable lease cost 2 3 Short-term lease cost 9 15 Total Lease Cost $ 18 $ 29 Supplemental Balance Sheet Data (in millions, except lease term and discount rates) June 30, 2019 Operating Leases Right of use assets included in other noncurrent assets, net $ 121 Operating lease liabilities included in other current liabilities $ 12 Long-term operating lease liabilities included in other noncurrent liabilities 108 Total Operating Lease Liabilities $ 120 Weighted average remaining lease term 13 years Weighted average discount rate 4.83 % Finance Leases Property, plant and equipment, gross $ 25 Accumulated depreciation (14 ) Property, Plant and Equipment, Net $ 11 Debt due within one year $ 3 Long-term debt 10 Total Finance Lease Liabilities $ 13 Weighted average remaining lease term 5 years Weighted average discount rate 5.88 % Lessor We provide storage at several of our terminals as well as certain other services to our Sponsor in which we are considered to be the lessor in accordance with U.S. GAAP. We charge fixed fees based on the total storage capacity of our tanks under those agreements. During the three and six months ended June 30, 2019 , we did not receive any material contingent lease payments. The term of the majority of the storage agreements is a primary term of ten years with two renewal option periods of five years , with the primary term scheduled to expire from 2021 to 2028. Our revenue from implicit lease arrangements, excluding executory costs, totaled $132 million and $91 million for the three months ended June 30, 2019 and 2018 , respectively, and $268 million and $178 million for the six months ended June 30, 2019 and 2018 , respectively. Based on the changes presented in ASC 842, we, as a lessor, may be required to reclassify contracts or existing operating leases to sales-type leases upon modification and related reassessment of the contract. If such a modification were to occur, it may result in the derecognition of existing assets, recognition of a receivable in the amount of the present value of fixed payments expected to be received by us under the contract, and recognition of a corresponding gain or loss in the period of change. We will evaluate the impact of a reassessment as modifications occur. Minimum Future Lease Revenue on Non-Cancellable Operating Leases (in millions) June 30, 2019 (a) 2019 $ 268 2020 535 2021 533 2022 533 2023 532 2024 and thereafter 6,292 Total Minimum Lease Revenue $ 8,693 (a) Includes minimum future lease revenue assuming all renewal option periods for each agreement are exercised. Investment in Assets Held for Operating Leases (in millions) June 30, December 31, 2018 Terminals and related assets $ 847 $ 778 Pipelines 110 110 Land and leasehold improvements 29 28 Construction in progress 21 15 Property, plant and equipment, at cost 1,007 931 Accumulated depreciation (262 ) (238 ) Property, Plant and Equipment, Net $ 745 $ 693

Debt (Notes)

Debt (Notes)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt	Debt Debt Balance, Net of Unamortized Issuance Costs (in millions) June 30, December 31, Total debt $ 5,263 $ 5,010 Unamortized issuance costs (40 ) (46 ) Current maturities (503 ) (504 ) Debt, Net of Current Maturities and Unamortized Issuance Costs $ 4,720 $ 4,460 Our debt is non-recourse to Marathon, except for TLGP and, with respect to borrowings under our Dropdown Credit Facility, WR Southwest. Available Capacity Under Credit Facilities (in millions) (a) Total Capacity Amount Borrowed as of June 30, 2019 Outstanding Letters of Credit Available Capacity as of June 30, 2019 Weighted Average Interest Rate Expiration Revolving Credit Facility $ 1,100 $ 1,070 $ — $ 30 3.90 % January 29, 2021 Dropdown Credit Facility 1,000 430 — 570 3.92 % January 29, 2021 MPC Loan Agreement 500 — — 500 — % December 21, 2023 Total Credit Facilities $ 2,600 $ 1,500 $ — $ 1,100 (a) In conjunction with the MPLX Merger, on July 30, 2019, all outstanding borrowings and unpaid fees on our credit facilities were repaid and the agreements were terminated, including the MPC Loan Agreement.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the ordinary course of business, we may become party to lawsuits, disputes, administrative proceedings and governmental investigations, including environmental, regulatory and other matters. The outcome of these matters cannot always be predicted accurately, but we will accrue liabilities for these matters if the amount is probable and can be reasonably estimated. While it is not possible to predict the outcome of such proceedings, if one or more of them were decided against us, we believe there would be no material impact on our condensed consolidated financial statements.

Equity (Notes)

Equity (Notes)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Equity and Net Earnings per Unit	Equity and Net Earnings per Unit We had 89,457,316 common public units and 600,000 6.875% Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the “Preferred Units”) outstanding as of June 30, 2019 . Additionally, Marathon owned 156,173,128 of our common units, constituting 64% ownership interest in us. Marathon also held 80,000 TexNew Mex units and all of the outstanding non-economic general partner units as of June 30, 2019 . See Note 1 for further discussion of the treatment of our common units in connection with the MPLX Merger. In addition, in connection with the MPLX Merger, our Preferred Units were exchanged for Series B Preferred Units of MPLX and our TexNew Mex units were converted into a new class of units of MPLX with substantially equivalent rights, powers, duties and obligations as our TexNew Mex Units. Changes to Equity (in millions) Three and Six Months Ended June 30, 2019 Common Preferred Total Balance at December 31, 2018 $ 4,070 $ 604 $ 4,674 Distributions to common and preferred unitholders (a) (240 ) (21 ) (261 ) Net earnings attributable to partners 147 10 157 Contributions (b) 19 — 19 Other 1 — 1 Balance at March 31, 2019 3,997 593 4,590 Distributions to common unitholders (a) (241 ) — (241 ) Net earnings attributable to partners 150 10 160 Contributions (b) 25 — 25 Balance at June 30, 2019 $ 3,931 $ 603 $ 4,534 Three and Six Months Ended June 30, 2018 Equity of Predecessors (c) Andeavor Logistics Total Common Preferred Balance at December 31, 2017 $ 1,292 $ 2,925 $ 589 $ 4,806 Sponsor contributions of assets to the Predecessors 197 — — 197 Loss attributable to the Predecessors (8 ) — — (8 ) Distributions to common and preferred unitholders (a) — (205 ) (8 ) (213 ) Net earnings attributable to partners — 125 14 139 Contributions (b) — 16 — 16 Cumulative effect of accounting standard adoption — (22 ) — (22 ) Other — — (1 ) (1 ) Balance at March 31, 2018 1,481 2,839 594 4,914 Sponsor contributions of assets to the Predecessors 139 — — 139 Loss attributable to the Predecessors (16 ) — — (16 ) Distributions to common unitholders (a) — (206 ) — (206 ) Net earnings attributable to partners — 138 10 148 Contributions (b) — 7 — 7 Other — 1 — 1 Balance at June 30, 2018 $ 1,604 $ 2,779 $ 604 $ 4,987 (a) Represents cash distributions declared and paid during the period. (b) Includes Marathon and TLGP contributions to us primarily related to reimbursements for capital spending pursuant predominantly to the Amended Omnibus Agreement and the Carson Assets Indemnity Agreement. (c) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. 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 will receive. Quarterly Distributions on Common Units Quarter Ended Quarterly Distribution Per Common Unit Total Cash Distribution (in millions) Date of Distribution Unitholders Record Date December 31, 2018 (a) $ 1.03 $ 238 February 14, 2019 February 5, 2019 March 31, 2019 (a) 1.03 240 May 15, 2019 May 9, 2019 (a) This distribution is net of $12.5 million waived with respect to units held by our Sponsor and its affiliates for the three months ended March 31, 2019 and $15 million for the three months ended December 31, 2018. These distribution waivers were instituted in 2017 under the terms of our partnership agreement. During the period from the execution of the MPLX Merger Agreement to the date that the MPLX Merger was consummated, we coordinated the record dates of our quarterly distributions with MPLX so that no holder of our common units received distributions from both us and MPLX or failed to receive one distribution. As a result of the record date of the MPLX distribution occurring after the MPLX Merger, we did not declare a distribution for the second quarter of 2019. During the six months ended June 30, 2019 and 2018 , we paid distributions of $21 million and $8 million , respectively, to holders of our Preferred Units . Distributions on the Preferred Units are payable semi-annually in arrears on the 15th day of February and August of each year. Due to the timing of the MPLX Merger, exchange of Preferred Units and the record dates discussed above, we did not declare a distribution associated with the Preferred Units for the first half of 2019. Net Earnings per Unit We use the two-class method when calculating the net earnings per unit applicable to limited partners, because we have more than one participating security. At June 30, 2019 , our participating securities consisted of common units, Preferred Units and TexNew Mex units. Net earnings is allocated between the partners in accordance with our partnership agreement. We base our calculation of net earnings per unit on the weighted average number of common limited partner units outstanding during the period. Diluted net earnings per unit include the effects of potentially dilutive units on our common units, which consist of unvested phantom units. Distributions less than or greater than earnings are allocated in accordance with our partnership agreement. Net Earnings per Unit (in millions, except per unit amounts) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Net earnings $ 160 $ 132 $ 317 $ 263 Distributions on Preferred Units (b) — (10 ) — (20 ) Net earnings attributable to common units 160 122 317 243 Limited partners’ distributions on common units (c) — (209 ) (240 ) (414 ) Distributions on common units less (greater) than earnings $ 160 $ (87 ) $ 77 $ (171 ) General partner’s earnings: Allocation of distributions greater than earnings (d) $ — $ (16 ) $ — $ (24 ) Total general partner’s loss $ — $ (16 ) $ — $ (24 ) Limited partners’ earnings on common units: Distributions (c)(e) $ — $ 209 $ 240 $ 414 Allocation of distributions less (greater) than earnings 160 (71 ) 77 (147 ) Total limited partners’ earnings on common units $ 160 $ 138 $ 317 $ 267 Weighted average limited partner units outstanding: Common units - basic 245.6 217.2 245.6 217.2 Common units - diluted (f) 245.7 217.3 245.7 217.3 Net earnings per limited partner unit: (g) Common - basic $ 0.65 $ 0.63 $ 1.29 $ 1.23 Common - diluted $ 0.65 $ 0.63 $ 1.29 $ 1.23 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. (b) The Preferred Units entitle unitholders to receive preferred distributions on a semi-annual basis. Due to the MPLX Merger, we did not declare a distribution for the first half of 2019. (c) We did not declare a distribution for the second quarter of 2019 due to the MPLX Merger. (d) We have revised the historical allocation of general partner earnings to include the Predecessors’ losses of $16 million and $24 million for the three and six months ended June 30, 2018 , respectively. (e) Distributions of earnings for limited partners’ common units for the three months ended June 30, 2018 is net of a $15 million waiver and the six months ended June 30, 2019 and 2018 are net of a $12.5 million and $30 million waiver, respectively, from our Sponsor. There was no waiver for the three months ended June 30, 2019 because we did not declare a distribution for the second quarter of 2019 due to the MPLX Merger. (f) Diluted net earnings per unit include the effects of potentially dilutive units on our common units, which consist of unvested phantom units. (g) Amounts may not recalculate due to rounding of dollar and unit information.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information (Notes)	6 Months Ended
	Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Supplemental Disclosures of Cash Activities (in millions) Six Months Ended 2019 2018 (a) Net cash from operating activities: Interest paid (net of amounts capitalized) $ 117 $ 78 Cash paid for amounts included in the measurement of lease liabilities: Payments on operating leases 8 — Net cash used in investing activities: Capital expenditures included in accounts payable 113 87 Net cash used in financing activities: Receivable from affiliate for capital expenditures 8 2 Principal payments under finance lease obligations 2 — Right of use assets obtained in exchange for new operating lease obligations 2 — Right of use assets obtained in exchange for new financing lease obligations 1 — (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Revenues (Notes)

Revenues (Notes)	6 Months Ended
	Jun. 30, 2019
Revenue Recognition [Abstract]
Revenues	Revenues We recognize revenue upon transfer of control of promised products or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those products or services. Revenue is recognized net of amounts collected from customers for taxes assessed by governmental authorities on, and concurrent with, specific revenue-producing transactions. Revenues (in millions) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Revenues from contracts with customers $ 469 $ 478 $ 963 $ 937 Lease revenues 132 91 268 178 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. Service Revenue We generate service revenue for gathering and transporting crude oil, natural gas and water; processing and fractionating natural gas and NGLs; and terminalling, transporting, and storing crude oil and refined products. We perform these services under various contractual arrangements with our customers. We recognize service revenue over time, as customers simultaneously receive and consume the related benefits of the services that we stand ready to provide. Where contracts contain provisions for minimum volume commitments, we assess the likelihood of insufficient volumes and recognize probable deficiency revenue ratably over the commitment or clawback period. Product Revenue We generate product revenue from the sale of NGLs and related products along with the sale of gasoline and diesel fuel within our wholesale business. We sell NGLs, shrink gas and condensate using natural gas we acquire from producers under our POP arrangements. We have certain fuel purchase and sale arrangements under which we receive certain minimum guaranteed margins with upside potential on a certain portion of our branded and unbranded fuel sales. Marathon retains control of fuel and is the principal in these affiliate arrangements. Therefore, we net the purchase and sale of fuel in our condensed consolidated statements of operations. Product revenues are recognized at a point-in-time, which generally occurs upon delivery and transfer of title to the customer. Other Arrangements Based on the terms of certain storage and other agreements in which the counterparty is primarily our Sponsor, we are considered to be the lessor under these implicit operating lease arrangements, as discussed in Note 4 . Customer Contract Assets Our receivables are primarily associated with customer contracts. Our payment terms vary by product or service type, and the period between invoicing and payment is not significant. Included in our receivables are balances associated with commodity sales on behalf of our producer customers, for which we remit the net sales price back to the producer customers upon completion of each sale. These balances are commingled in our receivables, net of allowance for doubtful accounts in our consolidated balance sheets. Our contract assets include amounts recognized for deficiency payments associated with minimum volume commitments which have not been billed to customers. These contract assets are included in prepayments and other current assets in our consolidated balance sheets and are shown in the "Summary of Customer Contract Assets and Liabilities" table below. Customer Contract Liabilities For certain products or services, we receive payment in advance of when performance obligations are satisfied. These liabilities from contracts with customers consist primarily of certain deficiency payments for minimum volume commitments and customer reimbursements of costs for capital projects. Customer advances for capital projects are generally recognized over the contract term. Payments for minimum volume commitments and other customer advances are included in deferred income within other current liabilities and other noncurrent liabilities based on timing of expected recognition, which may extend up to 15 years . During the three months ended June 30, 2019 and 2018 , we recognized $7 million and $6 million , respectively, and $18 million and $20 million during the six months ended June 30, 2019 and 2018 , respectively, in revenue from contract liabilities existing as of December 31, 2018 and January 1, 2018, respectively, after cumulative adjustments for the adoption of ASC 606. Summary of Customer Contract Assets and Liabilities (in millions) June 30, December 31, 2018 Other contract assets $ 22 $ 32 Deferred income, current 25 24 Deferred income, noncurrent 68 57 Remaining Performance Obligations We do not disclose the value of unsatisfied performance obligations for contracts with original expected terms of one year or less or the value of variable consideration related to unsatisfied performance obligations, when such values are not required to be estimated for purposes of allocation and recognition. Revenues associated with remaining obligations under contracts with terms in excess of one year related primarily to arrangements for which the customer has agreed to fixed consideration based on minimum throughput volume commitments or capacity utilization. As of June 30, 2019 , we had $3.8 billion of expected revenues from remaining performance obligations. The future revenues from our service arrangements with fixed fees or minimum throughput volume commitments will be recognized over the period of performance to which the fixed fee or commitment relates, which ranges from 1 year to 15 years . We expect approximately 85% of our total remaining obligations to be recognized within 5 years . Disaggregation Revenue is disaggregated by nature of revenue stream as presented in Note 10 because these categories depict how the nature, amount, timing and uncertainty of revenues and cash flows are affected by economic factors.

Operating Segments (Notes)

Operating Segments (Notes)	6 Months Ended
	Jun. 30, 2019
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Operating Segments	Operating Segments Our revenues are derived from three operating segments: Terminalling and Transportation, Gathering and Processing, and Wholesale. We evaluate the performance of our segments based primarily on segment operating income and net earnings before interest, income taxes, depreciation and amortization expenses (“EBITDA”). For the purposes of our operating segment disclosure, we present operating income as it is the most comparable measure to the amounts presented in our condensed statements of consolidated operations. Segment operating income includes those revenues and expenses that are directly attributable to management of the respective segment. 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. Our Terminalling and Transportation segment consists of pipeline systems, including regulated common carrier refined products pipeline systems and other pipelines, which transport products and crude oil primarily from Marathon’s refineries to nearby facilities, as well as crude oil and refined products terminals and storage facilities, marine terminals, stand-alone asphalt terminals as well as a 50% interest in PNAC, rail-car unloading facilities, an asphalt trucking operation and a petroleum coke handling and storage facility. Our Gathering and Processing segment consists of crude oil, natural gas, NGLs and produced water gathering systems in the Bakken Shale/Williston Basin area of North Dakota and Montana, the Green River Basin, Uinta Basin, and Vermillion Basin in the states of Utah, Colorado and Wyoming, the Delaware Basin in the Permian Basin area of West Texas and Southern New Mexico, and in the San Juan Basin in the Four Corners area of Northwestern New Mexico. It also consists of the Great Northern Midstream and Fryburg pipelines, crude trucking operations and gas processing and fractionation complexes. Our Wholesale segment includes the operations of several bulk petroleum distribution plants and a fleet of refined product delivery trucks that distribute commercial wholesale petroleum products primarily in Arizona, Colorado, Nevada, New Mexico and Texas. The refined product trucking business delivers a significant portion of the volumes sold by our Wholesale segment. Segment Information (in millions) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Revenues Terminalling and Transportation: Terminalling $ 248 $ 209 $ 493 $ 408 Pipeline transportation 47 40 93 71 Other revenues 2 1 4 3 Total Terminalling and Transportation 297 250 590 482 Gathering and Processing: NGL sales 94 95 216 199 Gas gathering and processing 75 82 145 167 Crude oil and water gathering 79 80 176 155 Pass-thru and other 36 44 68 79 Total Gathering and Processing 284 301 605 600 Wholesale: Fuel sales 17 15 29 24 Other wholesale 6 10 16 18 Total Wholesale 23 25 45 42 Intersegment wholesale revenues (3 ) (7 ) (9 ) (9 ) Total Revenues $ 601 $ 569 $ 1,231 $ 1,115 Segment Operating Income Terminalling and Transportation $ 146 $ 107 $ 298 $ 211 Gathering and Processing 59 69 122 146 Wholesale 12 11 17 15 Total Segment Operating Income 217 187 437 372 Unallocated general and administrative expenses (10 ) (7 ) (19 ) (15 ) Operating Income 207 180 418 357 Interest and financing costs, net (63 ) (60 ) (124 ) (115 ) Equity in earnings of equity method investments 9 10 16 18 Other income, net 7 2 7 3 Net Earnings $ 160 $ 132 $ 317 $ 263 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Depreciation and Amortization Expenses Terminalling and Transportation $ 38 $ 37 $ 74 $ 70 Gathering and Processing 64 54 126 107 Wholesale 2 2 5 5 Total Depreciation and Amortization Expenses $ 104 $ 93 $ 205 $ 182 Capital Expenditures Terminalling and Transportation $ 26 $ 33 $ 51 $ 79 Gathering and Processing 110 148 207 258 Wholesale — — — 1 Total Capital Expenditures $ 136 $ 181 $ 258 $ 338 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation, Policy	Principles of Consolidation Assets acquired from our Sponsor, and the associated liabilities and results of operations, are collectively referred to as the “Predecessors.” See Note 1 of our Annual Report on Form 10-K for the year ended December 31, 2018 and Note 2 for additional information regarding the assets acquired from our Sponsor. 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. On August 6, 2018, we acquired assets from our Sponsor (the “2018 Drop Down”). See Note 2 for additional information. As an entity under common control with our Sponsor, we record the assets that we acquire from our Sponsor on our condensed consolidated balance sheet at our Sponsor’s historical basis instead of fair value. Accordingly, the accompanying financial statements and related notes of Andeavor Logistics have been retrospectively adjusted to include the historical results of the assets acquired prior to the effective date of the acquisition. The financial statements of our Predecessors have been prepared from the separate records maintained by our Sponsor and may not necessarily be indicative of the conditions that would have existed or the results of operations if our Predecessors had been operated as an unaffiliated entity. For the six months ended June 30, 2018 , our condensed statement of cash flows includes net cash from operating activities of $86 million and net cash used in investing activities of $422 million from our Predecessors, offset by sponsor contributions of equity to the Predecessors in net cash from financing activities. The interim condensed consolidated financial statements and notes thereto have been prepared by management without audit according to the rules and regulations of the 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.
Basis of Accounting, Policy	Basis of Presentation We prepare our condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). However, certain information and notes normally included in financial statements prepared under U.S. GAAP have been condensed or omitted pursuant to the SEC’s rules and regulations. Management believes that the disclosures presented herein are adequate to present the information fairly. The accompanying interim condensed consolidated financial statements and notes should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2018 . Certain prior year balances have been aggregated or disaggregated in order to conform to the current year presentation.
Use of Estimates, Policy	We are required under U.S. GAAP 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. Our results of operations for any interim period are not necessarily indicative of results for the full year.
Cost of Sales, Policy	Cost Classifications Natural gas liquids (“NGL”) expense results from the cost of NGL purchases under our percent of proceeds (“POP”) arrangements as well as the non-cash acquisition of replacement dry gas under our keep-whole arrangements. Operating expenses are comprised of direct operating costs, including costs incurred for direct labor, repairs and maintenance, outside services, chemicals and catalysts, utility costs, including the purchase of electricity and natural gas used by our facilities, property taxes, environmental compliance costs related to current period operations, rent expense and other direct operating expenses incurred in the provision of services. Depreciation and amortization expenses consist of the depreciation and amortization of property, plant and equipment, deferred charges and intangible assets related to our operating segments along with our corporate operations. General and administrative expenses represent costs that are not directly or indirectly related to or otherwise are not allocated to our operations. NGL expense, direct operating expenses, and depreciation and amortization expenses recognized by our Terminalling and Transportation, Gathering and Processing, and Wholesale segments (refer to amounts disclosed in Note 10 ) constitute costs of revenue as defined by U.S. GAAP.
Fair Value of Financial Instruments, Policy	Financial Instruments 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”), our dropdown credit facility (“Dropdown Credit Facility”) and our loan agreement with MPC (the “MPC Loan Agreement”), which include a variable interest rate, approximate fair value. The carrying value and fair value of our debt were $5.3 billion and $5.4 billion as of June 30, 2019 , respectively, and were $5.0 billion and $4.9 billion at December 31, 2018 , respectively. These carrying and fair values of our debt exclude unamortized issuance costs, which are netted against our total debt. We believe the carrying value of our other financial instruments, including cash and cash equivalents, receivables, accounts payable and certain accrued liabilities, approximate fair value. Our fair value assessment incorporates a variety of considerations, including the short-term duration of the instruments and the expected future insignificance of bad debt expense, which includes an evaluation of counterparty credit risk.
New Accounting Pronouncement, Policy	New Accounting Standards and Disclosures Leases We adopted Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842)” (“ASC 842”), as of January 1, 2019, using the optional transition method. The optional transition method permits entities to adopt the provisions of ASC 842 prospectively without adjusting comparative periods, which we have elected. As part of the adoption of ASC 842, we elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to grandfather the historical accounting conclusions until a reassessment event is present. We have also elected the practical expedient to not recognize short-term leases on the balance sheet, and the practical expedient related to right of way permits and land easements, allowing us to carry forward our accounting treatment for those existing agreements. Further, we have elected the practical expedient to not separate lease and non-lease components for the majority of our underlying classes of assets except for our third-party contractor service and equipment agreements in which we are the lessee. We did not elect the practical expedient to combine lease and non-lease components for arrangements in which we are the lessor. In instances where the practical expedient was not elected, lease and non-lease consideration is allocated based on relative standalone selling price. Right of use assets represent our right to use an underlying asset in which we obtain substantially all of the economic benefits and convey the right to control during the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease right of use assets and lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Payments that are not fixed at the commencement date are considered variable and are excluded from the right of use asset and lease liability calculated. We recognized right of use assets and lease liabilities on the balance sheet for leases with a lease term of greater than one year. In the measurement of our right of use assets and lease liabilities, the fixed minimum lease payments in the agreement are discounted using a secured incremental borrowing rate provided by our financial service providers, as most of our leases do not provide an implicit rate, for a term similar to the duration of the lease. Operating lease expense is recognized on a straight-line basis over the lease term. Adoption of the new standard resulted in the recording of additional right of use lease assets and lease liabilities of $131 million and $133 million , respectively, as of January 1, 2019, as further described in Note 4 . The standard did not materially impact our condensed statements of consolidated operations or condensed statements of consolidated cash flows. As a lessor under ASC 842, we may be required to re-classify existing contracts or operating leases to sales-type leases upon modification and reassessment of the contract. If such a modification were to occur, it may result in the de-recognition of existing assets, recognition of a receivable in the amount of the present value of fixed payments expected to be received by us under the contract, and recognition of a corresponding gain or loss in the period of change. We will evaluate the impact of a reassessment as modifications occur. Stock Compensation In June 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-07, “Improvements to Nonemployee Share-Based Payment Accounting”, which expanded the scope of Topic 718 to include share-based payment awards to nonemployees and eliminated the classification differences for employee and nonemployee share-based payment awards. This guidance was effective for interim and annual periods beginning after December 15, 2018. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. Credit Losses In June 2016, the FASB issued ASU 2016-13, “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”), which amends guidance on the impairment of financial instruments. The ASU requires the estimation of credit losses based on expected losses and provides for a simplified accounting model for purchased financial assets with credit deterioration. In November 2018, the FASB issued ASU 2018-19, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses” that clarifies the scope of ASU 2016-13. In May 2019, the FASB issued ASU 2019-05, “Financial Instruments - Credit Losses (Topic 326) Targeted Transition Relief” to allow companies to irrevocably elect the fair value option on financial instruments that were previously recorded at amortized cost for eligible instruments . These ASUs are effective for annual reporting periods beginning after December 15, 2019, and interim reporting periods within those annual reporting periods. Early adoption is permitted for annual reporting periods beginning after December 15, 2018. While we are still evaluating the impact of ASU 2016-13, we do not expect to early adopt ASU 2016-13 nor expect the adoption of this standard to have a material impact on our consolidated financial statements.

Commitments and Contingencies C

Commitments and Contingencies Contingencies Accrued Liability (Policies)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingency Accrued Liabilities, Policy

Equity Earnings Per Unit (Polic

Equity Earnings Per Unit (Policies)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share, Policy	We use the two-class method when calculating the net earnings per unit applicable to limited partners, because we have more than one participating security. At June 30, 2019 , our participating securities consisted of common units, Preferred Units and TexNew Mex units. Net earnings is allocated between the partners in accordance with our partnership agreement. We base our calculation of net earnings per unit on the weighted average number of common limited partner units outstanding during the period. Diluted net earnings per unit include the effects of potentially dilutive units on our common units, which consist of unvested phantom units. Distributions less than or greater than earnings are allocated in accordance with our partnership agreement.

Revenues (Policies)

Revenues (Policies)	6 Months Ended
	Jun. 30, 2019
Revenue Recognition [Abstract]
Revenue Recognition, Policy	We recognize revenue upon transfer of control of promised products or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those products or services. Revenue is recognized net of amounts collected from customers for taxes assessed by governmental authorities on, and concurrent with, specific revenue-producing transactions.
Revenue Recognition, Sales of Services, Policy	Service Revenue We generate service revenue for gathering and transporting crude oil, natural gas and water; processing and fractionating natural gas and NGLs; and terminalling, transporting, and storing crude oil and refined products. We perform these services under various contractual arrangements with our customers. We recognize service revenue over time, as customers simultaneously receive and consume the related benefits of the services that we stand ready to provide. Where contracts contain provisions for minimum volume commitments, we assess the likelihood of insufficient volumes and recognize probable deficiency revenue ratably over the commitment or clawback period.
Revenue Recognition, Sales of Goods, Policy	Product Revenue We generate product revenue from the sale of NGLs and related products along with the sale of gasoline and diesel fuel within our wholesale business. We sell NGLs, shrink gas and condensate using natural gas we acquire from producers under our POP arrangements. We have certain fuel purchase and sale arrangements under which we receive certain minimum guaranteed margins with upside potential on a certain portion of our branded and unbranded fuel sales. Marathon retains control of fuel and is the principal in these affiliate arrangements. Therefore, we net the purchase and sale of fuel in our condensed consolidated statements of operations. Product revenues are recognized at a point-in-time, which generally occurs upon delivery and transfer of title to the customer.

Acquisitions Business Combinati

Acquisitions Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Reconciliation of Combined Financial Statements	Reconciliation of Combined Financial Statements (in millions) Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Combined Andeavor Logistics Predecessors Combined Andeavor Logistics Predecessors Revenues Affiliate $ 389 $ 381 $ 8 $ 716 $ 699 $ 17 Third-party 180 176 4 399 393 6 Total Revenues 569 557 12 1,115 1,092 23 Costs and Expenses NGL expense (exclusive of items shown separately below) 45 45 — 93 93 — Operating expenses (exclusive of depreciation and amortization) 221 201 20 422 391 31 Depreciation and amortization expenses 93 83 10 182 163 19 General and administrative expenses 29 25 4 60 52 8 Loss on asset disposals and impairments 1 1 — 1 1 — Operating Income (Loss) 180 202 (22 ) 357 392 (35 ) Interest and financing costs, net (60 ) (58 ) (2 ) (115 ) (112 ) (3 ) Equity in earnings of equity method investments 10 3 7 18 5 13 Other income, net 2 1 1 3 2 1 Net Earnings (Loss) $ 132 $ 148 $ (16 ) $ 263 $ 287 $ (24 ) Loss attributable to Predecessors $ 16 $ — $ 16 $ 24 $ — $ 24 Net Earnings Attributable to Partners 148 148 — 287 287 — Preferred unitholders’ interest in net earnings (10 ) (10 ) — (24 ) (24 ) — Limited Partners’ Interest in Net Earnings $ 138 $ 138 $ — $ 263 $ 263 $ —

Related-Party Transactions Re_2

Related-Party Transactions Related-Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	Summary of Revenue and Expense Transactions with our Sponsor (in millions) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Revenues (b) $ 424 $ 389 $ 868 $ 716 Operating expenses (c) 113 72 217 134 General and administrative expenses 15 22 29 46 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. (b) Represents 71% and 68% of our total revenues for the three months ended June 30, 2019 and 2018 , respectively, and 71% and 64% of our total revenues for the six months ended June 30, 2019 and 2018 , respectively. (c) Excludes reimbursements from our Sponsor pursuant to the Amended Omnibus Agreement, the Carson Assets Indemnity Agreement and other affiliate agreements of $7 million and $3 million for the three months ended June 30, 2019 and 2018 , respectively, and $10 million for both the six months ended June 30, 2019 and 2018 .

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Minimum Future Lease Revenue on Non-Cancellable Operating Leases	Minimum Future Lease Revenue on Non-Cancellable Operating Leases (in millions) June 30, 2019 (a) 2019 $ 268 2020 535 2021 533 2022 533 2023 532 2024 and thereafter 6,292 Total Minimum Lease Revenue $ 8,693 (a) Includes minimum future lease revenue assuming all renewal option periods for each agreement are exercised.
Lease Liabilities Maturities	Lease Liabilities Maturities (in millions) Lease Obligations Operating Finance 2019 $ 6 $ 2 2020 18 3 2021 15 2 2022 12 2 2023 12 2 2024 and thereafter 102 4 Gross lease payments 165 15 Less: imputed interest (45 ) (2 ) Total Lease Payments $ 120 $ 13
Components of Lease Expense	Components of Lease Expense (in millions) Three Months Ended June 30, 2019 Six Months Ended June 30 , 2019 Operating lease cost $ 5 $ 8 Finance lease cost: Amortization of right-of-use assets 1 2 Interest on lease liabilities 1 1 Total finance lease cost 2 3 Variable lease cost 2 3 Short-term lease cost 9 15 Total Lease Cost $ 18 $ 29
Supplemental Balance Sheet Data	Supplemental Balance Sheet Data (in millions, except lease term and discount rates) June 30, 2019 Operating Leases Right of use assets included in other noncurrent assets, net $ 121 Operating lease liabilities included in other current liabilities $ 12 Long-term operating lease liabilities included in other noncurrent liabilities 108 Total Operating Lease Liabilities $ 120 Weighted average remaining lease term 13 years Weighted average discount rate 4.83 % Finance Leases Property, plant and equipment, gross $ 25 Accumulated depreciation (14 ) Property, Plant and Equipment, Net $ 11 Debt due within one year $ 3 Long-term debt 10 Total Finance Lease Liabilities $ 13 Weighted average remaining lease term 5 years Weighted average discount rate 5.88 %
Investments in Assets Held for Operating Leases	Investment in Assets Held for Operating Leases (in millions) June 30, December 31, 2018 Terminals and related assets $ 847 $ 778 Pipelines 110 110 Land and leasehold improvements 29 28 Construction in progress 21 15 Property, plant and equipment, at cost 1,007 931 Accumulated depreciation (262 ) (238 ) Property, Plant and Equipment, Net $ 745 $ 693

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of Debt	Debt Balance, Net of Unamortized Issuance Costs (in millions) June 30, December 31, Total debt $ 5,263 $ 5,010 Unamortized issuance costs (40 ) (46 ) Current maturities (503 ) (504 ) Debt, Net of Current Maturities and Unamortized Issuance Costs $ 4,720 $ 4,460
Schedule of Line of Credit Facilities	Available Capacity Under Credit Facilities (in millions) (a) Total Capacity Amount Borrowed as of June 30, 2019 Outstanding Letters of Credit Available Capacity as of June 30, 2019 Weighted Average Interest Rate Expiration Revolving Credit Facility $ 1,100 $ 1,070 $ — $ 30 3.90 % January 29, 2021 Dropdown Credit Facility 1,000 430 — 570 3.92 % January 29, 2021 MPC Loan Agreement 500 — — 500 — % December 21, 2023 Total Credit Facilities $ 2,600 $ 1,500 $ — $ 1,100 (a) In conjunction with the MPLX Merger, on July 30, 2019, all outstanding borrowings and unpaid fees on our credit facilities were repaid and the agreements were terminated, including the MPC Loan Agreement.

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Schedule of partners' capital	Changes to Equity (in millions) Three and Six Months Ended June 30, 2019 Common Preferred Total Balance at December 31, 2018 $ 4,070 $ 604 $ 4,674 Distributions to common and preferred unitholders (a) (240 ) (21 ) (261 ) Net earnings attributable to partners 147 10 157 Contributions (b) 19 — 19 Other 1 — 1 Balance at March 31, 2019 3,997 593 4,590 Distributions to common unitholders (a) (241 ) — (241 ) Net earnings attributable to partners 150 10 160 Contributions (b) 25 — 25 Balance at June 30, 2019 $ 3,931 $ 603 $ 4,534 Three and Six Months Ended June 30, 2018 Equity of Predecessors (c) Andeavor Logistics Total Common Preferred Balance at December 31, 2017 $ 1,292 $ 2,925 $ 589 $ 4,806 Sponsor contributions of assets to the Predecessors 197 — — 197 Loss attributable to the Predecessors (8 ) — — (8 ) Distributions to common and preferred unitholders (a) — (205 ) (8 ) (213 ) Net earnings attributable to partners — 125 14 139 Contributions (b) — 16 — 16 Cumulative effect of accounting standard adoption — (22 ) — (22 ) Other — — (1 ) (1 ) Balance at March 31, 2018 1,481 2,839 594 4,914 Sponsor contributions of assets to the Predecessors 139 — — 139 Loss attributable to the Predecessors (16 ) — — (16 ) Distributions to common unitholders (a) — (206 ) — (206 ) Net earnings attributable to partners — 138 10 148 Contributions (b) — 7 — 7 Other — 1 — 1 Balance at June 30, 2018 $ 1,604 $ 2,779 $ 604 $ 4,987 (a) Represents cash distributions declared and paid during the period. (b) Includes Marathon and TLGP contributions to us primarily related to reimbursements for capital spending pursuant predominantly to the Amended Omnibus Agreement and the Carson Assets Indemnity Agreement. (c) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
Schedule of quarterly distributions	Quarterly Distributions on Common Units Quarter Ended Quarterly Distribution Per Common Unit Total Cash Distribution (in millions) Date of Distribution Unitholders Record Date December 31, 2018 (a) $ 1.03 $ 238 February 14, 2019 February 5, 2019 March 31, 2019 (a) 1.03 240 May 15, 2019 May 9, 2019 (a) This distribution is net of $12.5 million waived with respect to units held by our Sponsor and its affiliates for the three months ended March 31, 2019 and $15 million for the three months ended December 31, 2018. These distribution waivers were instituted in 2017 under the terms of our partnership agreement.
Schedule of Earnings Per Share, Basic and Diluted	Net Earnings per Unit (in millions, except per unit amounts) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Net earnings $ 160 $ 132 $ 317 $ 263 Distributions on Preferred Units (b) — (10 ) — (20 ) Net earnings attributable to common units 160 122 317 243 Limited partners’ distributions on common units (c) — (209 ) (240 ) (414 ) Distributions on common units less (greater) than earnings $ 160 $ (87 ) $ 77 $ (171 ) General partner’s earnings: Allocation of distributions greater than earnings (d) $ — $ (16 ) $ — $ (24 ) Total general partner’s loss $ — $ (16 ) $ — $ (24 ) Limited partners’ earnings on common units: Distributions (c)(e) $ — $ 209 $ 240 $ 414 Allocation of distributions less (greater) than earnings 160 (71 ) 77 (147 ) Total limited partners’ earnings on common units $ 160 $ 138 $ 317 $ 267 Weighted average limited partner units outstanding: Common units - basic 245.6 217.2 245.6 217.2 Common units - diluted (f) 245.7 217.3 245.7 217.3 Net earnings per limited partner unit: (g) Common - basic $ 0.65 $ 0.63 $ 1.29 $ 1.23 Common - diluted $ 0.65 $ 0.63 $ 1.29 $ 1.23 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. (b) The Preferred Units entitle unitholders to receive preferred distributions on a semi-annual basis. Due to the MPLX Merger, we did not declare a distribution for the first half of 2019. (c) We did not declare a distribution for the second quarter of 2019 due to the MPLX Merger. (d) We have revised the historical allocation of general partner earnings to include the Predecessors’ losses of $16 million and $24 million for the three and six months ended June 30, 2018 , respectively. (e) Distributions of earnings for limited partners’ common units for the three months ended June 30, 2018 is net of a $15 million waiver and the six months ended June 30, 2019 and 2018 are net of a $12.5 million and $30 million waiver, respectively, from our Sponsor. There was no waiver for the three months ended June 30, 2019 because we did not declare a distribution for the second quarter of 2019 due to the MPLX Merger. (f) Diluted net earnings per unit include the effects of potentially dilutive units on our common units, which consist of unvested phantom units. (g) Amounts may not recalculate due to rounding of dollar and unit information.

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	6 Months Ended
	Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Cash Activities	Supplemental Disclosures of Cash Activities (in millions) Six Months Ended 2019 2018 (a) Net cash from operating activities: Interest paid (net of amounts capitalized) $ 117 $ 78 Cash paid for amounts included in the measurement of lease liabilities: Payments on operating leases 8 — Net cash used in investing activities: Capital expenditures included in accounts payable 113 87 Net cash used in financing activities: Receivable from affiliate for capital expenditures 8 2 Principal payments under finance lease obligations 2 — Right of use assets obtained in exchange for new operating lease obligations 2 — Right of use assets obtained in exchange for new financing lease obligations 1 — (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Revenues (Tables)

Revenues (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue Recognition [Abstract]
Disaggregation of Revenue	Revenues (in millions) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Revenues from contracts with customers $ 469 $ 478 $ 963 $ 937 Lease revenues 132 91 268 178 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
Contract with Customer, Asset and Liability	Summary of Customer Contract Assets and Liabilities (in millions) June 30, December 31, 2018 Other contract assets $ 22 $ 32 Deferred income, current 25 24 Deferred income, noncurrent 68 57

Operating Segments (Tables)

Operating Segments (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Segment Information	Segment Information (in millions) Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Revenues Terminalling and Transportation: Terminalling $ 248 $ 209 $ 493 $ 408 Pipeline transportation 47 40 93 71 Other revenues 2 1 4 3 Total Terminalling and Transportation 297 250 590 482 Gathering and Processing: NGL sales 94 95 216 199 Gas gathering and processing 75 82 145 167 Crude oil and water gathering 79 80 176 155 Pass-thru and other 36 44 68 79 Total Gathering and Processing 284 301 605 600 Wholesale: Fuel sales 17 15 29 24 Other wholesale 6 10 16 18 Total Wholesale 23 25 45 42 Intersegment wholesale revenues (3 ) (7 ) (9 ) (9 ) Total Revenues $ 601 $ 569 $ 1,231 $ 1,115 Segment Operating Income Terminalling and Transportation $ 146 $ 107 $ 298 $ 211 Gathering and Processing 59 69 122 146 Wholesale 12 11 17 15 Total Segment Operating Income 217 187 437 372 Unallocated general and administrative expenses (10 ) (7 ) (19 ) (15 ) Operating Income 207 180 418 357 Interest and financing costs, net (63 ) (60 ) (124 ) (115 ) Equity in earnings of equity method investments 9 10 16 18 Other income, net 7 2 7 3 Net Earnings $ 160 $ 132 $ 317 $ 263 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion. Three Months Ended Six Months Ended 2019 2018 (a) 2019 2018 (a) Depreciation and Amortization Expenses Terminalling and Transportation $ 38 $ 37 $ 74 $ 70 Gathering and Processing 64 54 126 107 Wholesale 2 2 5 5 Total Depreciation and Amortization Expenses $ 104 $ 93 $ 205 $ 182 Capital Expenditures Terminalling and Transportation $ 26 $ 33 $ 51 $ 79 Gathering and Processing 110 148 207 258 Wholesale — — — 1 Total Capital Expenditures $ 136 $ 181 $ 258 $ 338 (a) Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Organization and Basis of Pre_3

Organization and Basis of Presentation, Fair Value (Details) - USD ($) $ in Millions	Jan. 02, 2019	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2018		Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			$ 2	$ 0	[1]
Finance Lease, Liability			$ 13
Limited Partners' Capital Account, Units Outstanding			245,630,444			245,000,000		245,493,184
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			64.00%			64.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest						100.00%
Net Cash Provided by (Used in) Operating Activities, Continuing Operations			$ 483	547	[2]
Net Cash Provided by (Used in) Investing Activities			(265)	(748)	[2]
Debt, carrying value			5,300					$ 5,000
Debt, fair value			$ 5,400					$ 4,900
Limited Partner Units, Public
Limited Partners' Capital Account, Units Outstanding			89,457,316
Limited Partner Units, Affiliate
Limited Partners' Capital Account, Units Outstanding			156,173,128			156,000,000
Accounting Standards Update 2016-02
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 131
Finance Lease, Liability							$ 133
Predecessors
Net Cash Provided by (Used in) Operating Activities, Continuing Operations				86
Net Cash Provided by (Used in) Investing Activities				$ 422
Subsequent Event | MPLX Merger | Limited Partner Units, Public
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		1.135
Subsequent Event | MPLX Merger | Limited Partner Units, Affiliate
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		1.0328
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Acquisitions Dropdown (Details)

Acquisitions Dropdown (Details) - USD ($) $ in Millions	Aug. 06, 2018	May 01, 2018
Logistics Assets Drop Down and Asset Transfer
Business Combination, Consideration Transferred	$ 1,550
Wamsutter Pipeline System
Distributions in connection with acquisitions		$ 180

Acquisitions Drop Down - Reconc

Acquisitions Drop Down - Reconciliation of Combined Financial Statements (Details) - USD ($) $ in Millions		3 Months Ended					6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018		Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues		$ 601		$ 569	[1],[2]		$ 1,231	$ 1,115	[1],[2]
NGL expense (excluding items shown separately below)		33		45	[2]		92	93	[2]
Operating expenses (excluding depreciation and amortization)		237		221	[2]		476	422	[2]
Depreciation and amortization expenses		104		93	[2]		205	182	[2],[3]
General and administrative expenses		18		29	[2]		38	60	[2]
Loss on asset disposals and impairments		2		1	[2]		2	1	[2],[3]
Operating Income		207		180	[1],[2]		418	357	[1],[2]
Interest and financing costs, net		(63)		(60)	[1],[2]		(124)	(115)	[1],[2]
Equity in earnings of equity method investments		9		10	[1],[2]		16	18	[1],[2]
Other income, net		7		2	[1],[2]		7	3	[1],[2]
Net Earnings		160		132	[1],[2],[4]		317	263	[1],[2],[3],[4]
Net Income (Loss) Attributable To Predecessors	[2]			16				24
Net Earnings Attributable to Partners		160	$ 157	148		$ 139	317	287
Preferred unitholders’ interest in net earnings		(10)		(10)			(20)	(24)
Limited Partners’ Interest in Net Earnings		150		138			297	263
Third Party
Revenues		177		180	[2]		363	399	[2]
Affiliated Entity
Revenues	[5]	$ 424		389	[2],[6]		$ 868	716	[2],[6]
Successors
Revenues				557				1,092
NGL expense (excluding items shown separately below)				45				93
Operating expenses (excluding depreciation and amortization)				201				391
Depreciation and amortization expenses				83				163
General and administrative expenses				25				52
Loss on asset disposals and impairments				1				1
Operating Income				202				392
Interest and financing costs, net				(58)				(112)
Equity in earnings of equity method investments				3				5
Other income, net				1				2
Net Earnings	[2]			148				287
Net Income (Loss) Attributable To Predecessors	[2]			0				0
Net Earnings Attributable to Partners				148				287
Preferred unitholders’ interest in net earnings				(10)				(24)
Limited Partners’ Interest in Net Earnings				138				263
Successors | Third Party
Revenues				176				393
Successors | Affiliated Entity
Revenues				381				699
Predecessors
Revenues				12				23
NGL expense (excluding items shown separately below)				0				0
Operating expenses (excluding depreciation and amortization)				20				31
Depreciation and amortization expenses				10				19
General and administrative expenses				4				8
Loss on asset disposals and impairments				0				0
Operating Income				(22)				(35)
Interest and financing costs, net				(2)				(3)
Equity in earnings of equity method investments				7				13
Other income, net				1				1
Net Earnings	[2]			(16)				(24)
Net Income (Loss) Attributable To Predecessors	[2]			16				24
Net Earnings Attributable to Partners				0				0
Preferred unitholders’ interest in net earnings				0				0
Limited Partners’ Interest in Net Earnings				0				0
Predecessors | Third Party
Revenues				4				6
Predecessors | Affiliated Entity
Revenues				$ 8				$ 17
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[5]	Represents 71% and 68% of our total revenues for the three months ended June 30, 2019 and 2018 , respectively, and 71% and 64% of our total revenues for the six months ended June 30, 2019 and 2018 , respectively.
[6]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Related-Party Transactions Re_3

Related-Party Transactions Related-Party Transactions, Summary of Transactions Narrative (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Recovery of Direct Costs		$ 7		$ 3		$ 10	$ 10
Revenues		601		569	[1],[2]	1,231	1,115	[1],[2]
Related Party Transactions, Operating Expenses	[3]	113		72	[4]	217	134	[4]
Related Party Transactions, General and Administrative Expenses		$ 15		$ 22	[4]	$ 29	$ 46	[4]
Concentration Risk, Percentage		71.00%		68.00%		71.00%	64.00%
Payments of Distributions to Affiliates			$ 294
Secondment and Logistics Services Agreement
Term Of Agreement						10 years
Length Of Time For Continuing Minimum Payments						60 days
Partner to Andeavor | Omnibus Agreement
Payment for Administrative Fees						$ 17
Andeavor to Partner | Secondment and Logistics Services Agreement
Long-term Purchase Commitment, Amount		$ 24		$ 4		47	$ 10
Affiliated Entity
Revenues	[5]	$ 424		$ 389	[2],[4]	$ 868	$ 716	[2],[4]
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	Excludes reimbursements from our Sponsor pursuant to the Amended Omnibus Agreement, the Carson Assets Indemnity Agreement and other affiliate agreements of $7 million and $3 million for the three months ended June 30, 2019 and 2018 , respectively, and $10 million for both the six months ended June 30, 2019 and 2018 .
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[5]	Represents 71% and 68% of our total revenues for the three months ended June 30, 2019 and 2018 , respectively, and 71% and 64% of our total revenues for the six months ended June 30, 2019 and 2018 , respectively.

Related-Party Transactions Re_4

Related-Party Transactions Related-Party Transactions, Summary of Affiliate Transactions (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Revenues		$ 601	$ 569	[1],[2]	$ 1,231	$ 1,115	[1],[2]
Concentration Risk, Percentage		71.00%	68.00%		71.00%	64.00%
Related Party Transactions, Operating Expenses	[3]	$ 113	$ 72	[4]	$ 217	$ 134	[4]
Related Party Transactions, General and Administrative Expenses		15	22	[4]	29	46	[4]
Recovery of Direct Costs		7	3		10	10
Affiliated Entity
Revenues	[5]	$ 424	$ 389	[2],[4]	$ 868	$ 716	[2],[4]
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	Excludes reimbursements from our Sponsor pursuant to the Amended Omnibus Agreement, the Carson Assets Indemnity Agreement and other affiliate agreements of $7 million and $3 million for the three months ended June 30, 2019 and 2018 , respectively, and $10 million for both the six months ended June 30, 2019 and 2018 .
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[5]	Represents 71% and 68% of our total revenues for the three months ended June 30, 2019 and 2018 , respectively, and 71% and 64% of our total revenues for the six months ended June 30, 2019 and 2018 , respectively.

Leases Lease Payments (Details)

Leases Lease Payments (Details) $ in Millions	Jun. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 6
Lessee, Operating Lease, Liability, Payments, Due Year Two	18
Lessee, Operating Lease, Liability, Payments, Due Year Three	15
Lessee, Operating Lease, Liability, Payments, Due Year Four	12
Lessee, Operating Lease, Liability, Payments, Due Year Five	12
Lessee, Operating Lease, Liability, Payments, Due after Year Five	102
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(45)
Lessee, Operating Lease, Liability, Payments, Due	165
Operating Lease, Liability	120
Finance Lease, Liability, Payment, Due [Abstract]
Finance Lease, Liability, Payments, Remainder of Fiscal Year	2
Finance Lease, Liability, Payments, Due Year Two	3
Finance Lease, Liability, Payments, Due Year Three	2
Finance Lease, Liability, Payments, Due Year Four	2
Finance Lease, Liability, Payments, Due Year Five	2
Finance Lease, Liability, Payments, Due after Year Five	4
Finance Lease, Liability, Payment, Due	15
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	(2)
Finance Lease, Liability	$ 13
Minimum
Finance Lease, Liability, Payment, Due [Abstract]
Lessee, Finance Lease, Term of Contract	1 year
Maximum
Finance Lease, Liability, Payment, Due [Abstract]
Lessee, Finance Lease, Term of Contract	25 years

Leases Lease Costs (Details)

Leases Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 1	$ 2
Finance Lease, Interest Expense	1	1
Finance Lease Cost	2	3
Operating Lease, Cost	5	8
Variable Lease, Cost	2	3
Short-term Lease, Cost	9	15
Lease, Cost	$ 18	$ 29

Leases Lease Assets & Liabiliti

Leases Lease Assets & Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Capital Leased Assets [Line Items]
Property, plant and equipment, at cost	$ 8,409	$ 8,145
Accumulated depreciation	(1,480)	(1,300)
Property, Plant and Equipment, Net	6,929	$ 6,845
Finance Lease, Liability, Current	3
Finance Lease, Liability, Noncurrent	10
Finance Lease, Liability	$ 13
Finance Lease, Weighted Average Discount Rate, Percent	5.88%
Finance Lease, Weighted Average Remaining Lease Term	5 years
Leases, Operating [Abstract]
Operating Lease, Right-of-Use Asset	$ 121
Operating Lease, Liability, Current	12
Operating Lease, Liability, Noncurrent	108
Operating Lease, Liability	$ 120
Operating Lease, Weighted Average Remaining Lease Term	13 years
Operating Lease, Weighted Average Discount Rate, Percent	4.83%
Energy Equipment
Capital Leased Assets [Line Items]
Property, plant and equipment, at cost	$ 25
Accumulated depreciation	(14)
Property, Plant and Equipment, Net	$ 11

Leases Lessor (Details)

Leases Lessor (Details) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	[1]	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	[1]
Lessor, Lease, Description [Line Items]
Operating Leases, Income Statement, Lease Revenue		$ 132	$ 91		$ 268	$ 178
Lessor, Operating Lease, Term of Contract		10 years			10 years
Number Of Contract Renewals					2
Lessor, Operating Lease, Renewal Term		5 years			5 years
2019	[2]	$ 268			$ 268
2020	[2]	535			535
2021	[2]	533			533
2022	[2]	533			533
2023	[2]	532			532
2024 and thereafter	[2]	6,292			6,292
Total Minimum Lease Revenue	[2]	$ 8,693			$ 8,693
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Includes minimum future lease revenue assuming all renewal option periods for each agreement are exercised.

Leases Lessor - Property (Detai

Leases Lessor - Property (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property Subject to or Available for Operating Lease, Gross	$ 1,007	$ 931
Property Subject to or Available for Operating Lease, Accumulated Depreciation	(262)	(238)
Property Subject to or Available for Operating Lease, Net	745	693
Terminals and related assets
Property, Plant and Equipment [Line Items]
Property Subject to or Available for Operating Lease, Gross	847	778
Pipelines
Property, Plant and Equipment [Line Items]
Property Subject to or Available for Operating Lease, Gross	110	110
Land and leasehold improvements
Property, Plant and Equipment [Line Items]
Property Subject to or Available for Operating Lease, Gross	29	28
Construction in Progress
Property, Plant and Equipment [Line Items]
Property Subject to or Available for Operating Lease, Gross	$ 21	$ 15

Debt Total Debt (Details)

Debt Total Debt (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Total debt	$ 5,263	$ 5,010
Unamortized issuance costs	(40)	(46)
Current maturities	(503)	(504)
Debt, Net of Current Maturities and Unamortized Issuance Costs	$ 4,720	$ 4,460

Debt Credit Facilities (Details

Debt Credit Facilities (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Line of Credit Facility [Line Items]
Total Capacity	$ 2,600
Amount Borrowed as of June 30, 2019	1,500
Outstanding Letters of Credit	0
Available Capacity as of June 30, 2019	1,100
Revolving Credit Facility
Line of Credit Facility [Line Items]
Outstanding Letters of Credit	0
Available Capacity as of June 30, 2019	$ 30
Expiration	Jan. 29, 2021
Dropdown Credit Facility
Line of Credit Facility [Line Items]
Outstanding Letters of Credit	$ 0
Available Capacity as of June 30, 2019	$ 570
Expiration	Jan. 29, 2021
Revolving Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Amount Borrowed as of June 30, 2019	$ 1,070
Weighted Average Interest Rate	3.90%
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,100	[1]
Revolving Credit Facility | Dropdown Credit Facility
Line of Credit Facility [Line Items]
Amount Borrowed as of June 30, 2019	$ 430
Weighted Average Interest Rate	3.92%
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000	[1]
Revolving Credit Facility | MPC Loan Agreement
Line of Credit Facility [Line Items]
Amount Borrowed as of June 30, 2019	0
Outstanding Letters of Credit	0
Available Capacity as of June 30, 2019	$ 500
Expiration	Dec. 21, 2023
Weighted Average Interest Rate	0.00%
Line of Credit Facility, Maximum Borrowing Capacity	$ 500	[1]
[1]	In conjunction with the MPLX Merger, on July 30, 2019, all outstanding borrowings and unpaid fees on our credit facilities were repaid and the agreements were terminated, including the MPC Loan Agreement.

Equity Equity, Narrative (Detai

Equity Equity, Narrative (Details) - shares	6 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Limited Partners' Capital Account, Units Outstanding	245,630,444	245,000,000	245,493,184
Preferred Units, Outstanding	600,000		600,000
Preferred Stock, Dividend Rate, Percentage	6.875%
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	64.00%	64.00%
Limited Partner Units, Public
Limited Partners' Capital Account, Units Outstanding	89,457,316
Limited Partner Units, Affiliate
Limited Partners' Capital Account, Units Outstanding	156,173,128	156,000,000
TexNew Mex Units
Limited Partners' Capital Account, Units Outstanding	80,000

Equity, Equity Activity (Detail

Equity, Equity Activity (Details) - USD ($) $ in Millions		3 Months Ended								6 Months Ended
		Jun. 30, 2019		Mar. 31, 2019		Jun. 30, 2018		Mar. 31, 2018		Jun. 30, 2019	Jun. 30, 2018		Dec. 31, 2018
Changes in carrying amount of Equity
Balance at December 31		$ 4,590		$ 4,674		$ 4,914		$ 4,806		$ 4,674	$ 4,806
Partners Capital Contribution Other	[1]					7		16
Distributions to common and preferred unitholders (a)	[2]	(241)		(261)		(206)		(213)
Net earnings attributable to partners		160		157		148		139		317	287
Cumulative effect of accounting standard adoption								(22)
Contributions (b)		25	[1]	19	[1]	139		197
Loss attributable to Predecessors		0				(16)	[3]	(8)		0	(24)	[3]
Other				1		1		(1)
Balance at March 31		4,534		4,590		4,987		4,914		4,534	4,987
Common unitholders; 245,630,444 units issued and outstanding (245,493,184 in 2018)		3,931								3,931
Preferred unitholders; 600,000 units issued and outstanding in 2019 and 2018		603								$ 603
Predecessor Equity
Changes in carrying amount of Equity
Balance at December 31						1,481		1,292	[4]		1,292	[4]
Partners Capital Contribution Other						0	[1]	0
Distributions to common and preferred unitholders (a)						0		0
Net earnings attributable to partners						0		0
Cumulative effect of accounting standard adoption								0
Contributions (b)						139		197	[4]
Loss attributable to Predecessors						(16)		(8)	[4]
Other						0		0
Balance at March 31						1,604	[4]	1,481			1,604	[4]
Common
Changes in carrying amount of Equity
Balance at December 31		3,997				2,839		2,925			2,925
Partners Capital Contribution Other	[1]					7		16
Distributions to common and preferred unitholders (a)	[2]	241		240		(206)		(205)
Net earnings attributable to partners		150		147		138		125
Cumulative effect of accounting standard adoption								(22)
Contributions (b)		25	[1]	19	[1]	0		0
Loss attributable to Predecessors						0		0
Other				1		1		0
Balance at March 31				3,997		2,779		2,839			2,779
Common unitholders; 245,630,444 units issued and outstanding (245,493,184 in 2018)													$ 4,070
Preferred Partner
Changes in carrying amount of Equity
Balance at December 31		593				594		589			589
Partners Capital Contribution Other	[1]					0		0
Distributions to common and preferred unitholders (a)	[2]	0		21		0		(8)
Net earnings attributable to partners		10		10		10		14
Cumulative effect of accounting standard adoption								0
Contributions (b)		$ 0	[1]	0	[1]	0		0
Loss attributable to Predecessors						0		0
Other				0		0		(1)
Balance at March 31				$ 593		$ 604		$ 594			$ 604
Preferred unitholders; 600,000 units issued and outstanding in 2019 and 2018													$ 604
[1]	Includes Marathon and TLGP contributions to us primarily related to reimbursements for capital spending pursuant predominantly to the Amended Omnibus Agreement and the Carson Assets Indemnity Agreement.
[2]	Represents cash distributions declared and paid during the period.
[3]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Equity, Cash Distributions (Det

Equity, Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								6 Months Ended
	Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018	Jun. 30, 2018		Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Distribution Made to Member or Limited Partner
Loss attributable to Predecessors	$ 0					$ 16	[1]	$ 8	$ 0	$ 24	[1]
Distributions to preferred unitholders									21	8	[2]
Distribution to Partner, Waived Distribution	$ 0		$ 12.5		$ 15	15			12.5	30
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 1.03		$ 1.03
Distributions to common unitholders	$ 240	[3]	$ 238	[3]					$ 480	$ 411	[2]
Distribution Made to Limited Partner, Distribution Date	May 15, 2019		Feb. 14, 2019
Distribution Made to Limited Partner, Date of Record	May 9, 2019		Feb. 5, 2019
Common
Distribution Made to Member or Limited Partner
Loss attributable to Predecessors						$ 0		$ 0
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	This distribution is net of $12.5 million waived with respect to units held by our Sponsor and its affiliates for the three months ended March 31, 2019 and $15 million for the three months ended December 31, 2018. These distribution waivers were instituted in 2017 under the terms of our partnership agreement.

Equity Equity, Earnings Per Uni

Equity Equity, Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended							6 Months Ended
		Jun. 30, 2019		Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018		Mar. 31, 2018	Jun. 30, 2019		Jun. 30, 2018
Net earnings		$ 160				$ 132	[1],[2],[3]		$ 317		$ 263	[1],[2],[3],[4]
Distributions on Preferred Units (b)	[5]	0				(10)	[2]		0		(20)	[2]
Limited Partners’ Interest in Net Earnings		160				122	[2]		317		243	[2]
Distributions on common units less (greater) than earnings		$ 160				$ (87)	[2]		$ 77		$ (171)	[2]
Common units - basic		245.6				217.2			245.6		217.2
Common units - diluted	[6]	245.7				217.3			245.7		217.3
Common - basic	[7]	$ 0.65				$ 0.63			$ 1.29		$ 1.23
Common - diluted	[7]	$ 0.65				$ 0.63			$ 1.29		$ 1.23
Distribution to Partner, Waived Distribution		$ 0		$ 12.5	$ 15	$ 15			$ 12.5		$ 30
Loss attributable to Predecessors		0				16	[3]	$ 8	0		24	[3]
Common
Limited partners’ distributions on common units (c)	[8]	0	[9]			(209)	[2]		(240)	[9]	(414)	[2]
Distributions on common units less (greater) than earnings		160				(71)	[2]		77		(147)	[2]
GP and LP Earnings (Loss)		160				138	[2]		317		267	[2]
Loss attributable to Predecessors						0		$ 0
General Partner
Distributions on common units less (greater) than earnings	[10]	0				16	[2]		0		24	[2]
GP and LP Earnings (Loss)		$ 0				$ (16)	[2]		$ 0		$ (24)	[2]
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[5]	The Preferred Units entitle unitholders to receive preferred distributions on a semi-annual basis. Due to the MPLX Merger, we did not declare a distribution for the first half of 2019.
[6]	Diluted net earnings per unit include the effects of potentially dilutive units on our common units, which consist of unvested phantom units.
[7]	Amounts may not recalculate due to rounding of dollar and unit information.
[8]	Distributions of earnings for limited partners’ common units for the three months ended June 30, 2018 is net of a $15 million waiver and the six months ended June 30, 2019 and 2018 are net of a $12.5 million and $30 million waiver, respectively, from our Sponsor. There was no waiver for the three months ended June 30, 2019 because we did not declare a distribution for the second quarter of 2019 due to the MPLX Merger.
[9]	We did not declare a distribution for the second quarter of 2019 due to the MPLX Merger.
[10]	We have revised the historical allocation of general partner earnings to include the Predecessors’ losses of $16 million and $24 million for the three and six months ended June 30, 2018 , respectively.

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	[1]
Supplemental Cash Flow Elements [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 117	$ 78
Operating Lease, Payments	8	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2	0
Capital Expenditures Incurred but Not yet Paid	113	87
Receivable From Affiliate For Capital Expenditures	8	2
Finance Lease, Principal Payments	2	0
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 1	$ 0
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Revenues Revenue Recognition, N

Revenues Revenue Recognition, Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3,800			$ 3,800
Contract with Customer, Liability, Revenue Recognized	7	$ 6		18	$ 20
Revenue from Contract with Customer, Including Assessed Tax	469	478	[1]	963	937	[1]
Operating Leases, Income Statement, Lease Revenue	$ 132	$ 91	[1]	$ 268	$ 178	[1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years			5 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Percent	85.00%			85.00%
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year			1 year
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	15 years			15 years
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

Revenues Contract Assets and Li

Revenues Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue Recognition [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 7	$ 6	$ 18	$ 20
Contract with Customer, Asset, after Allowance for Credit Loss	22		22		$ 32
Deferred Revenue, Current	25		25		24
Deferred Revenue, Noncurrent	$ 68		$ 68		$ 57

Operating Segments Operating Se

Operating Segments Operating Segments, Results (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)		Jun. 30, 2019USD ($)segments	Jun. 30, 2018USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segments				3
Revenues	$ 601	$ 569	[1],[2]	$ 1,231	$ 1,115	[1],[2]
Operating Income	207	180	[1],[2]	418	357	[1],[2]
Segment Reporting Operating Income	217	187	[1]	437	372	[1]
Unallocated general and administrative expenses	(10)	(7)	[1]	(19)	(15)	[1]
Interest and financing costs, net	(63)	(60)	[1],[2]	(124)	(115)	[1],[2]
Equity in earnings of equity method investments	9	10	[1],[2]	16	18	[1],[2]
Other income, net	7	2	[1],[2]	7	3	[1],[2]
Net Earnings	160	132	[1],[2],[3]	317	263	[1],[2],[3],[4]
Depreciation and amortization expenses	104	93	[2]	205	182	[2],[4]
Additions to Other Assets, Amount	136	181	[5]	258	338	[5]
Operating Segments | Terminalling and Transportation
Segment Reporting Information [Line Items]
Revenues	297	250	[1]	590	482	[1]
Operating Income	146	107	[1]	298	211	[1]
Depreciation and amortization expenses	38	37	[5]	74	70	[5]
Additions to Other Assets, Amount	26	33	[5]	51	79	[5]
Operating Segments | Gathering and Processing
Segment Reporting Information [Line Items]
Revenues	284	301	[1]	605	600	[1]
Operating Income	59	69	[1]	122	146	[1]
Depreciation and amortization expenses	64	54	[5]	126	107	[5]
Additions to Other Assets, Amount	110	148	[5]	207	258	[5]
Operating Segments | Wholesale Segment
Segment Reporting Information [Line Items]
Revenues	23	25		45	42
Operating Income	12	11		17	15
Depreciation and amortization expenses	2	2		5	5
Additions to Other Assets, Amount	0	0		0	1
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(3)	(7)		(9)	(9)
Terminalling revenues | Operating Segments | Terminalling and Transportation
Segment Reporting Information [Line Items]
Revenues	248	209	[1]	493	408	[1]
Pipeline transportation revenues | Operating Segments | Terminalling and Transportation
Segment Reporting Information [Line Items]
Revenues	47	40	[1]	93	71	[1]
Other Terminalling and Transportation Revenue | Operating Segments | Terminalling and Transportation
Segment Reporting Information [Line Items]
Revenues	2	1	[1]	4	3	[1]
Sales of natural gas, NGLS and condensate | Operating Segments | Gathering and Processing
Segment Reporting Information [Line Items]
Revenues	94	95	[1]	216	199	[1]
Gas gathering and processing | Operating Segments | Gathering and Processing
Segment Reporting Information [Line Items]
Revenues	75	82	[1]	145	167	[1]
Crude oil and water gathering | Operating Segments | Gathering and Processing
Segment Reporting Information [Line Items]
Revenues	79	80	[1]	176	155	[1]
Pass-thru and other revenue | Operating Segments | Gathering and Processing
Segment Reporting Information [Line Items]
Revenues	36	44	[1]	68	79	[1]
Fuel Sales | Operating Segments | Wholesale Segment
Segment Reporting Information [Line Items]
Revenues	17	15		29	24
Other Non-fuel | Operating Segments | Wholesale Segment
Segment Reporting Information [Line Items]
Revenues	$ 6	$ 10		$ 16	$ 18
PNAC
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	50.00%			50.00%
[1]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[4]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[5]	Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.