Shell Midstream Partners (SHLX) 10-Q7 May 202020 Q1 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2020	May 07, 2020
Cover [Abstract]
Document Quarterly Report	true
Document Transition Report	false
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Trading Symbol	SHLX
Entity Registrant Name	Shell Midstream Partners, L.P.
Entity Shell Company	false
Security Exchange Name	NYSE
Title of 12(b) Security	Common Units, Representing Limited Partner Interests
Entity Incorporation, State or Country Code	DE
Entity Central Index Key	0001610466
Current Fiscal Year End Date	--12-31
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity File Number	001-36710
Entity Tax Identification Number	46-5223743
City Area Code	832
Local Phone Number	337-2034
Entity Address, Postal Zip Code	77079
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Address Line One	150 N. Dairy Ashford
Entity Common Stock, Shares Outstanding		393,289,537

UNAUDITED CONSOLIDATED BALANCE

UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 292	$ 290
Accounts receivable – third parties, net	10	12
Accounts receivable – related parties	32	29
Allowance oil	4	12
Prepaid expenses	13	16
Total current assets	351	359
Equity method investments	912	926
Property, plant and equipment, net	717	726
Operating lease right-of-use assets	4	4
Other investments	2	2
Other assets – related parties	2	2
Total assets	1,988	2,019
Current liabilities
Accounts payable – third parties	1	5
Accounts payable – related parties	8	10
Deferred revenue – third parties	1	0
Deferred revenue – related party	1	0
Accrued liabilities – third parties	12	12
Accrued liabilities – related parties	17	19
Total current liabilities	40	46
Noncurrent liabilities
Debt payable – related party	2,692	2,692
Operating lease liabilities	4	4
Finance lease liabilities	24	24
Other unearned income	2	2
Total noncurrent liabilities	2,722	2,722
Total liabilities	2,762	2,768
Commitments and Contingencies (Note 12)
(DEFICIT) EQUITY
Accumulated other comprehensive loss	(8)	(8)
Total partners’ deficit	(799)	(775)
Noncontrolling interests	25	26
Total deficit	(774)	(749)
Total liabilities and deficit	1,988	2,019
Shell Pipeline Company L P
(DEFICIT) EQUITY
General partner – SPLC (4,761,012 units issued and outstanding as of both March 31, 2020 and December 31, 2019)	(4,014)	(4,014)
Common Units \| General Public
(DEFICIT) EQUITY
Common unitholders	3,437	3,450
Common Units \| Shell Pipeline Company L P
(DEFICIT) EQUITY
Common unitholders	$ (214)	$ (203)

UNAUDITED CONSOLIDATED BALANC_2

UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Mar. 31, 2020	Dec. 31, 2019
Common unitholders' capital account, units outstanding (in shares)	233,289,537	233,289,537
Shell Pipeline Company L P
General partners' capital account, units issued (in shares)	4,761,012	4,761,012
General partners' capital account, units outstanding (in shares)	4,761,012	4,761,012
Common Units \| General Public
Common unitholders' capital account, units issued (in shares)	123,832,233	123,832,233
Common unitholders' capital account, units outstanding (in shares)	123,832,233	123,832,233
Common Units \| Shell Pipeline Company L P
Common unitholders' capital account, units issued (in shares)	109,457,304	109,457,304
Common unitholders' capital account, units outstanding (in shares)	109,457,304	109,457,304

UNAUDITED CONSOLIDATED STATEMEN

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue
Revenue from contract with customer	$ 107	$ 117
Lease revenue – related parties		14
Lease revenue – related parties	14
Total revenue	121	131
Costs and expenses
Operations and maintenance – third parties	14	13
Operations and maintenance – related parties	14	14
Cost of product sold	15	9
Loss from revision of asset retirement obligation	0	2
General and administrative – third parties	3	1
General and administrative – related parties	12	11
Depreciation, amortization and accretion	13	12
Property and other taxes	5	4
Total costs and expenses	76	66
Operating income	45	65
Income from equity method investments	112	70
Dividend income from other investments	0	14
Other income	9	8
Investment, dividend and other income	121	92
Interest expense, net	24	20
Income before income taxes	142	137
Income tax expense	0	0
Net income	142	137
Less: Net income attributable to noncontrolling interests	4	5
Net income attributable to the Partnership	138	132
Limited Partners’ interest in net income attributable to the Partnership	$ 83	$ 105
Net income per Limited Partner Unit - Basic and Diluted:
Distributions per Limited Partner unit (in dollars per share)	$ 0.460	$ 0.4150
Shell Pipeline Company L P
Costs and expenses
General partner’s interest in net income attributable to the Partnership	$ 55	$ 27
Common
Costs and expenses
Net income attributable to the Partnership	$ 83	$ 105
Net income per Limited Partner Unit - Basic and Diluted:
Net income per Limited Partner unit (in dollars per share)	$ 0.36	$ 0.47
Common units – public
Costs and expenses
Net income	$ 44	$ 58
Weighted average Limited Partner Units outstanding - Basic and Diluted:
Weighted average Limited Partner units outstanding - Common (in shares)	123.8	123.8
Common units – public \| Shell Pipeline Company L P
Costs and expenses
Net income	$ 39	$ 47
Common units – SPLC \| Shell Pipeline Company L P
Weighted average Limited Partner Units outstanding - Basic and Diluted:
Weighted average Limited Partner units outstanding - Common (in shares)	109.5	100
Third Parties \| Transportation, Terminaling and Storage Services
Revenue
Revenue from contract with customer	$ 31	$ 42
Third Parties \| Product Revenue
Revenue
Revenue from contract with customer	0	1
Related Parties \| Transportation, Terminaling and Storage Services
Revenue
Revenue from contract with customer	69	64
Related Parties \| Product Revenue
Revenue
Revenue from contract with customer	$ 7	$ 10

UNAUDITED CONSOLIDATED STATEM_2

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net income	$ 142	$ 137
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	13	12
Loss from revision of asset retirement obligation	0	2
Allowance oil reduction to net realizable value	8	0
Undistributed equity earnings	0	(3)
Changes in operating assets and liabilities
Accounts receivable	(3)	5
Allowance oil	0	2
Prepaid expenses and other assets	3	4
Accounts payable	(3)	(1)
Deferred revenue and other unearned income	2	(8)
Net cash provided by operating activities	162	150
Cash flows from investing activities
Capital expenditures	(7)	(10)
Contributions to investment	0	(5)
Return of investment	14	8
Net cash provided by (used in) investing activities	7	(7)
Cash flows from financing activities
Distributions to noncontrolling interests	(5)	(3)
Distributions to unitholders and general partner	(162)	(129)
Other contributions from Parent	0	7
Net cash used in financing activities	(167)	(125)
Net increase in cash and cash equivalents	2	18
Cash and cash equivalents at beginning of the period	290	208
Cash and cash equivalents at end of the period	292	226
Non-cash investing and financing transactions:
Change in accrued capital expenditures	$ (4)	$ 2

UNAUDITED CONSOLIDATED STATEM_3

UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN (DEFICIT) EQUITY - USD ($) $ in Millions	Total	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Common Unitholders	Common UnitholdersShell Pipeline Company L P	General PartnerShell Pipeline Company L P
Beginning balance at Dec. 31, 2018	$ (257)		$ 25	$ 3,459	$ (198)	$ (3,543)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	137		5	58	47	27
Other contributions from Parent	7					7
Distributions to unitholders and general partner	(129)			(49)	(40)	(40)
Distributions to noncontrolling interests	(3)		(3)
Ending balance at Mar. 31, 2019	(254)		27	3,464	(196)	(3,549)
Beginning balance at Dec. 31, 2019	(749)	$ (8)	26	3,450	(203)	(4,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	142		4	44	39	55
Distributions to unitholders and general partner	(162)			(57)	(50)	(55)
Distributions to noncontrolling interests	(5)		(5)
Ending balance at Mar. 31, 2020	$ (774)	$ (8)	$ 25	$ 3,437	$ (214)	$ (4,014)

UNAUDITED CONSOLIDATED STATEM_4

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 142	$ 137
Other comprehensive loss, net of tax:
Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax	0	0
Comprehensive income	142	137
Less comprehensive income attributable to noncontrolling interests	4	5
Comprehensive income attributable to the Partnership	$ 138	$ 132

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
Description of Business and Basis of Presentation	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Shell Midstream Partners, L.P. (“we,” “us,” “our,” “SHLX” or “the Partnership”) is a Delaware limited partnership formed by Royal Dutch Shell plc on March 19, 2014 to own and operate pipeline and other midstream assets, including certain assets acquired from Shell Pipeline Company LP (“SPLC”) and its affiliates. We conduct our operations either through our wholly owned subsidiary Shell Midstream Operating LLC (the “Operating Company”) or through direct ownership. Our general partner is Shell Midstream Partners GP LLC (“general partner” or “sponsor”). References to “RDS”, “Shell” or “Parent” refer collectively to Royal Dutch Shell plc and its controlled affiliates, other than us, our subsidiaries and our general partner. Description of Business We own, operate, develop and acquire pipelines and other midstream assets. As of March 31, 2020, our assets include interests in entities that own crude oil and refined products pipelines and terminals that serve as key infrastructure to (i) transport onshore and offshore crude oil production to Gulf Coast and Midwest refining markets and (ii) deliver refined products from those markets to major demand centers. Our assets also include interests in entities that own natural gas and refinery gas pipelines that transport offshore natural gas to market hubs and deliver refinery gas from refineries and plants to chemical sites along the Gulf Coast. We generate revenue from the transportation, terminaling and storage of crude oil and refined products through our pipelines and storage tanks, and generate income from our equity and other investments. Our operations consist of one reportable segment. The following table reflects our ownership interests as of March 31, 2020: SHLX Ownership Pecten Midstream LLC (“Pecten”) 100.0 % Sand Dollar Pipeline LLC (“Sand Dollar”) 100.0 % Triton West LLC (“Triton”) 100.0 % Zydeco Pipeline Company LLC (“Zydeco”) (1) 92.5 % Amberjack Pipeline Company LLC (“Amberjack”) – Series A/Series B 75.0% / 50.0% Mars Oil Pipeline Company LLC (“Mars”) 71.5 % Odyssey Pipeline L.L.C. (“Odyssey”) 71.0 % Bengal Pipeline Company LLC (“Bengal”) 50.0 % Crestwood Permian Basin LLC (“Permian Basin”) 50.0 % LOCAP LLC (“LOCAP”) 41.48 % Explorer Pipeline Company (“Explorer”) 38.59 % Poseidon Oil Pipeline Company, L.L.C. (“Poseidon”) 36.0 % Colonial Enterprises, Inc. (“Colonial”) 16.125 % Proteus Oil Pipeline Company, LLC (“Proteus”) 10.0 % Endymion Oil Pipeline Company, LLC (“Endymion”) 10.0 % Cleopatra Gas Gathering Company, LLC (“Cleopatra”) 1.0 % (1) SPLC owns the remaining 7.5% ownership interest in Zydeco. Basis of Presentation Our unaudited consolidated financial statements include all subsidiaries required to be consolidated under generally accepted accounting principles in the United States (“GAAP”). Our reporting currency is U.S. dollars, and all references to dollars are U.S. dollars. The accompanying unaudited consolidated financial statements and related notes have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete annual financial statements. The year-end consolidated balance sheet data was derived from audited financial statements. During interim periods, we follow the accounting policies disclosed in our Annual Report on Form 10-K for the year ended December 31, 2019 (our “2019 Annual Report”), filed with the United States Securities and Exchange Commission (“SEC”) unless otherwise described herein. The unaudited consolidated financial statements for the three months ended March 31, 2020 and March 31, 2019 include all adjustments we believe are necessary for a fair statement of the results of operations for the interim periods presented. These adjustments are of a normal recurring nature unless otherwise disclosed. Operating results for the interim periods are not necessarily indicative of the results that may be expected for the full year. These unaudited consolidated financial statements and other information included in this Quarterly Report on Form 10-Q should be read in conjunction with our audited consolidated financial statements and notes thereto included in our 2019 Annual Report. Our consolidated subsidiaries include Pecten, Sand Dollar, Triton, Zydeco, Odyssey and the Operating Company. Asset acquisitions of additional interests in previously consolidated subsidiaries and interests in equity method and other investments are included in the financial statements prospectively from the effective date of each acquisition. In cases where these types of acquisitions are considered acquisitions of businesses under common control, the financial statements are retrospectively adjusted. Summary of Significant Accounting Policies The accounting policies are set forth in Note 2 — Summary of Significant Accounting Policies in the Notes to Consolidated Financial Statements of our 2019 Annual Report. There have been no significant changes to these policies during the three months ended March 31, 2020, other than those noted below. Allowance for Expected Credit Losses Accounts receivable represent valid claims against customers for products sold or services rendered, net of allowances for doubtful accounts. We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate. We establish provisions for losses on third party accounts receivable due from shippers and operators based on current expected credit losses. As of March 31, 2020 and December 31, 2019, we did not have a material amount of allowance for doubtful accounts. Recent Accounting Pronouncements Standards Adopted as of January 1, 2020 In June 2016, the FASB issued ASU 2016-13 to Topic 326, Financial Instruments — Credit Losses: Measurement of Credit Losses on Financial Instruments, which replaces the current incurred loss impairment method with a method that reflects expected credit losses on financial instruments. The measurement of current expected credit losses under the new guidance is applicable to financial assets measured at amortized cost, including third-party trade receivables. We adopted the new standard effective January 1, 2020 using the modified retrospective method for all financial assets measured. No cumulative-effect adjustment to retained earnings was required upon adoption. The adoption of ASU 2016-13 did not have a material impact on our consolidated financial statements.

Related Party Transactions

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Related party transactions include transactions with SPLC and Shell, including those entities in which Shell has an ownership interest but does not have control. Acquisition Agreements For a description of applicable agreements, see Note 3—Acquisitions and Divestiture in the Notes to Consolidated Financial Statements of our 2019 Annual Report. 2019 Omnibus Agreement On November 3, 2014, we entered into an Omnibus Agreement with SPLC and our general partner concerning our payment of an annual general and administrative services fee to SPLC as well as our reimbursement of certain costs incurred by SPLC on our behalf. On February 19, 2019, we, our general partner, SPLC, the Operating Company and Shell Oil Company terminated the Omnibus Agreement effective as of February 1, 2019, and we, our general partner, SPLC and the Operating Company entered into a new Omnibus Agreement effective February 1, 2019 (the “2019 Omnibus Agreement”). On February 18, 2020, pursuant to the 2019 Omnibus Agreement, the Board of Directors of our general partner (the “Board”) approved a 3% inflationary increase to the annual general and administrative fee for 2020. The 2019 Omnibus Agreement addresses, among other things, the following matters: • our payment of an annual general and administrative fee of approximately $11 million for the provision of certain services by SPLC; • our obligation to reimburse SPLC for certain direct or allocated costs and expenses incurred by SPLC on our behalf; and • our obligation to reimburse SPLC for all expenses incurred by SPLC as a result of us becoming and continuing as a publicly traded entity; we will reimburse our general partner for these expenses to the extent the fees relating to such services are not included in the general and administrative fee. Under the 2019 Omnibus Agreement, SPLC agreed to indemnify us against tax liabilities relating to our assets acquired at our initial public offering (our “initial assets”) that are identified prior to the date that is 60 days after the expiration of the statute of limitations applicable to such liabilities. This obligation has no threshold or cap. We in turn agreed to indemnify SPLC against events and conditions associated with the ownership or operation of our initial assets (other than any liabilities against which SPLC is specifically required to indemnify us as described above). During the three months ended March 31, 2020, neither we, nor SPLC, made any claims for indemnification under the 2019 Omnibus Agreement. Trade Marks License Agreement We, our general partner and SPLC entered into a Trade Marks License Agreement with Shell Trademark Management Inc. effective as of February 1, 2019. The Trade Marks License Agreement grants us the use of certain Shell trademarks and trade names and expires on January 1, 2024 unless earlier terminated by either party upon 360 days’ notice. Tax Sharing Agreement For a discussion of the Tax Sharing Agreement, see Note 4—Related Party Transactions—Tax Sharing Agreement in the Notes to Consolidated Financial Statements of our 2019 Annual Report. Other Agreements We have entered into several other customary agreements with SPLC and Shell. These agreements include pipeline operating agreements, reimbursement agreements and services agreements. See Note 4—Related Party Transactions—Other Agreements in the Notes to Consolidated Financial Statements of our 2019 Annual Report. Partnership Agreement On December 21, 2018, we executed Amendment No. 2 (the “Second Amendment”) to the Partnership’s First Amended and Restated Agreement of Limited Partnership dated November 3, 2014 (as so amended, our “partnership agreement”). Under the Second Amendment, our sponsor agreed to waive $50 million of distributions in 2019 by agreeing to reduce distributions to holders of the Partnership's incentive distribution rights (“IDRs”) by: (1) $17 million for the three months ended March 31, 2019, (2) $17 million for the three months ended June 30, 2019 and (3) $16 million for the three months ended September 30, 2019. Noncontrolling Interests For Zydeco, noncontrolling interest consists of SPLC’s 7.5% retained ownership interest as of both March 31, 2020 and December 31, 2019. For Odyssey, noncontrolling interest consists of GEL Offshore Pipeline LLC’s (“GEL”) 29.0% retained ownership interest as of both March 31, 2020 and December 31, 2019. Other Related Party Balances Other related party balances consist of the following: March 31, 2020 December 31, 2019 Accounts receivable $ 32 $ 29 Prepaid expenses 11 15 Other assets 2 2 Accounts payable (1) 8 10 Deferred revenue 1 — Accrued liabilities (2) 17 19 Debt payable (3) 2,692 2,692 (1) Accounts payable reflects amounts owed to SPLC for reimbursement of third-party expenses incurred by SPLC for our benefit. (2) As of March 31, 2020, Accrued liabilities reflects $17 million accrued interest. As of December 31, 2019, Accrued liabilities reflects $18 million accrued interest and $1 million other accrued liabilities. (3) Debt payable reflects borrowings outstanding after taking into account unamortized debt issuance costs of $2 million as of both March 31, 2020 and December 31, 2019. Related Party Credit Facilities We have entered into five credit facilities with Shell Treasury Center (West) Inc. (“STCW”): the Ten Seven Five Five Note 6 – Related Party Debt in this report and Note 8 – Related Party Debt in the Notes to Consolidated Financial Statements of our 2019 Annual Report. Related Party Revenues and Expenses We provide crude oil transportation, terminaling and storage services to related parties under long-term contracts. We entered into these contracts in the normal course of our business. Our revenue from related parties for the three months ended March 31, 2020 and March 31, 2019 is disclosed in Note 9 – Revenue Recognition . The following table shows related party expenses, including certain personnel costs, incurred by Shell and SPLC on our behalf that are reflected in the accompanying unaudited consolidated statements of income for the indicated periods. Included in these amounts, and disclosed below, is our share of operating and general corporate expenses, as well as the fees paid to SPLC under certain agreements. Three Months Ended March 31, 2020 2019 Allocated operating expenses $ 4 $ 5 Insurance expense (1) 5 4 Other (2) 5 5 Operations and maintenance – related parties $ 14 $ 14 Allocated general corporate expenses $ 7 $ 6 Management Agreement fee 2 2 Omnibus Agreement fee 3 3 General and administrative – related parties $ 12 $ 11 (1) The majority of our insurance coverage is provided by a wholly owned subsidiary of Shell. The remaining coverage is provided by third-party insurers. (2) Other expenses primarily relate to salaries and wages and other payroll expenses. For a discussion of services performed by Shell on our behalf, see Note 1 – Description of Business and Basis of Presentation – Basis of Presentation in the Notes to Consolidated Financial Statements of our 2019 Annual Report. Pension and Retirement Savings Plans Employees who directly or indirectly support our operations participate in the pension, postretirement health and life insurance, and defined contribution benefit plans sponsored by Shell, which include other Shell subsidiaries. Our share of pension and postretirement health and life insurance costs for both the three months ended March 31, 2020 and March 31, 2019 were $2 million. Our share of defined contribution benefit plan costs for both the three months ended March 31, 2020 and March 31, 2019 were $1 million. Pension and defined contribution benefit plan expenses are included in either General and administrative – related parties or Operations and maintenance – related parties, depending on the nature of the employee’s role in our operations. Share-based Compensation Certain SPLC and Shell employees supporting our operations as well as other Shell operations were historically granted awards under the Performance Share Plan, Shell’s incentive compensation program. Share-based compensation expense is included in General and administrative – related parties in the accompanying unaudited consolidated statements of income. These costs for both the three months ended March 31, 2020 and March 31, 2019 were not material. Equity and Other Investments We have equity and other investments in various entities. In some cases, we may be required to make capital contributions or other payments to these entities. See Note 3 – Equity Method Investments for additional details. Reimbursements Total reimbursements received for the three months ended March 31, 2020 were not material and for the three months ended March 31, 2019 were $7 million. These reimbursements are included in Other contributions from Parent in the accompanying unaudited consolidated statements of cash flows. As the directional drill project on the Zydeco pipeline system was finalized at the end of 2019, the amount incurred by the project and claims for reimbursement from our Parent in the three months ended March 31, 2020 were immaterial. During the three months ended March 31, 2019, we filed claims for reimbursement from our Parent of $7 million. For each of these periods, this amount reflects our proportionate share of the Zydeco directional drill project costs and expenses.

Equity Method Investments

Equity Method Investments	3 Months Ended
Equity Method Investments	Mar. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	For each of the following investments, we have the ability to exercise significant influence over these investments based on certain governance provisions and our participation in the significant activities and decisions that impact the management and economic performance of the investments. Equity method investments comprise the following as of the dates indicated: March 31, 2020 December 31, 2019 Ownership Investment Amount Ownership Investment Amount Amberjack – Series A / Series B 75.0% / 50.0% $ 418 75.0% / 50.0% $ 426 Mars 71.5% 160 71.5% 161 Bengal 50.0% 87 50.0% 88 Permian Basin 50.0% 90 50.0% 91 LOCAP 41.48% 9 41.48% 9 Explorer 38.59% 85 38.59% 88 Poseidon 36.0% — 36.0% — Colonial 16.125% 30 16.125% 30 Proteus 10.0% 15 10.0% 15 Endymion 10.0% 18 10.0% 18 $ 912 $ 926 Unamortized differences in the basis of the initial investments and our interest in the separate net assets within the financial statements of the investees are amortized into net income over the remaining useful lives of the underlying assets. As of March 31, 2020 and December 31, 2019, the unamortized basis differences included in our equity investments are $90 million and $92 million, respectively. For the three months ended March 31, 2020 and March 31, 2019, the net amortization expense was $2 million and $1 million, respectively. During the first quarter of 2018, the investment amount for Poseidon was reduced to zero due to distributions received that were in excess of our investment balance and we, therefore, suspended the equity method of accounting. Further, we have no commitments to provide further financial support to Poseidon. As such, we have recorded excess distributions in Other income of $9 million and $8 million for the three months ended March 31, 2020 and March 31, 2019, respectively. Once our cumulative share of equity earnings becomes greater than the amount of distributions received, we will resume the equity method of accounting as long as the equity method investment balance remains greater than zero. Earnings from our equity method investments were as follows during the periods indicated: Three Months Ended March 31, 2020 2019 Amberjack $ 29 $ 32 Mars 31 29 Bengal 5 5 Explorer (1) 14 — Colonial (1) 27 — Other (2) 6 4 $ 112 $ 70 (1) We acquired additional interests in Explorer and Colonial in June 2019. The acquisition of these interests has been accounted for prospectively. (2) Included in Other is the activity associated with our investments in Permian Basin, LOCAP, Proteus and Endymion. The adoption of Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers, and all related accounting standards updates to such Topic (collectively, “the revenue standard”) for the majority of our equity method investments followed the non-public business entity adoption date of January 1, 2019 for their stand-alone financial statements, with the exception of Mars and Permian Basin, which adopted on January 1, 2018. As a result of the adoption of the revenue standard on January 1, 2019, we recognized our proportionate share of Amberjack’s cumulative effect transition adjustments as a decrease to opening equity (deficit) in the amount of $9 million under the modified retrospective transition method. Under ASC Topic 842 , Leases , the adoption date for our equity method investments will follow the non-public business entity adoption date of January 1, 202 0 or 202 1 for their stand-alone financial statements , with the exception of Permian Basin, which adopted on January 1, 2019. There was no material impact on the Partnership's consolidated financial statements as a result of the adoption of the lease standard. We assess our equity method investments for impairment whenever changes in the facts and circumstances indicate a loss in value has occurred, if the loss is deemed to be other than temporary. Due to the change in market conditions, as of March 31, 2020, we evaluated whether an impairment indicator existed. Based on our current forecast and expectations of market conditions, we determined that there was no triggering event that required us to update our impairment evaluation of our equity method investments. However, if the facts and circumstances change in the near term and indicate a loss in value that is other than temporary, we will re-evaluate whether the carrying amount of our equity method investments may not be recoverable. Summarized Financial Information The following tables present aggregated selected unaudited income statement data for our equity method investments on a 100% basis. However, during periods in which an acquisition occurs, the selected unaudited income statement data reflects activity from the date of the acquisition. Three Months Ended March 31, 2020 Total revenues Total operating expenses Operating income Net income Statements of Income Amberjack $ 76 $ 19 $ 57 $ 57 Mars 72 28 44 44 Bengal 17 7 10 10 Explorer 96 47 49 38 Colonial 401 163 238 169 Poseidon 33 9 24 22 Other (1) 57 27 30 25 (1) Included in Other is the activity associated with our investments in Permian Basin, LOCAP, Proteus and Endymion. Three Months Ended March 31, 2019 Total revenues Total operating expenses Operating income Net income Statements of Income Amberjack $ 81 $ 19 $ 62 $ 62 Mars 63 22 41 41 Bengal 18 7 11 11 Poseidon 31 9 22 20 Other (1) 30 18 12 9 (1) Included in Other is the activity associated with our investments in Permian Basin, LOCAP, Proteus and Endymion. Capital Contributions

Property, Plant and Equipment

Property, Plant and Equipment	3 Months Ended
Property, Plant and Equipment	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment consist of the following as of the dates indicated: Depreciable March 31, 2020 December 31, 2019 Land — $ 11 $ 11 Building and improvements 10 - 40 years 40 40 Pipeline and equipment (1) 10 - 30 years 1,245 1,228 Other 5 - 25 years 33 33 1,329 1,312 Accumulated depreciation and amortization (2) (626) (613) 703 699 Construction in progress 14 27 Property, plant and equipment, net $ 717 $ 726 (1) As of both March 31, 2020 and December 31, 2019, includes costs of $369 million, related to assets under operating lease (as lessor). As of both March 31, 2020 and December 31, 2019, includes cost of $23 million, related to right-of-use (“ROU”) assets under finance lease (as lessee). (2) As of March 31, 2020 and December 31, 2019, includes accumulated depreciation of $136 million and $133 million, respectively, related to assets under operating lease (as lessor). As of March 31, 2020 and December 31, 2019, includes accumulated amortization of $7 million and $6 million, respectively, related to ROU assets under finance lease (as lessee). Depreciation and amortization expense on property, plant and equipment for the three months ended March 31, 2020 and March 31, 2019 was $13 million and $12 million, respectively, and is included in costs and expenses in the accompanying unaudited consolidated statements of income. Depreciation and amortization expense on property, plant and equipment includes amounts pertaining to assets under operating leases (as lessor) and finance leases (as lessee). We evaluate long-lived assets for potential impairment indicators whenever events or changes in circumstances indicate that the carrying amount of our assets may not be recoverable. Due to the change in market conditions, as of March 31, 2020, we evaluated whether an impairment indicator existed. Based on our current forecast and expectations of market conditions, we determined that there was no triggering event that required us to update our impairment evaluation of property, plant and equipment. However, if market conditions deteriorate further or continue to persist for an extended period of time, we may be required to assess the recoverability of our long-lived assets which could result in an impairment.

Accrued Liabilities - Third Par

Accrued Liabilities - Third Parties	3 Months Ended
Accrued Liabilities - Third Parties	Mar. 31, 2020
Payables and Accruals [Abstract]
Accrued Liabilities - Third Parties	Accrued Liabilities – Third Parties Accrued liabilities – third parties consist of the following as of the dates indicated: March 31, 2020 December 31, 2019 Project accruals $ 4 $ 5 Property taxes 5 4 Other accrued liabilities 3 3 Accrued liabilities – third parties $ 12 $ 12 See Note 2—Related Party Transactions for a discussion of Accrued liabilities – related parties.

Related Party Debt

Related Party Debt	3 Months Ended
Related Party Debt	Mar. 31, 2020
Debt Disclosure [Abstract]
Related Party Debt	Related Party Debt Consolidated related party debt obligations comprise the following as of the dates indicated: March 31, 2020 December 31, 2019 Outstanding Balance Total Capacity Available Capacity Outstanding Balance Total Capacity Available Capacity Ten Year Fixed Facility $ 600 $ 600 $ — $ 600 $ 600 $ — Seven Year Fixed Facility 600 600 — 600 600 — Five Year Revolver due July 2023 494 760 266 494 760 266 Five Year Revolver due December 2022 400 1,000 600 400 1,000 600 Five Year Fixed Facility 600 600 — 600 600 — 2019 Zydeco Revolver — 30 30 — 30 30 Unamortized debt issuance costs (2) n/a n/a (2) n/a n/a Debt payable – related party $ 2,692 $ 3,590 $ 896 $ 2,692 $ 3,590 $ 896 For the three months ended March 31, 2020 and March 31, 2019, interest and fee expenses associated with our borrowings, net of capitalized interest, were $24 million and $20 million, respectively. We paid $25 million and $20 million, respectively, during the three months ended March 31, 2020 and March 31, 2019. Borrowings under our revolving credit facilities approximate fair value as the interest rates are variable and reflective of market rates, which results in Level 2 instruments. The fair value of our fixed rate credit facilities is estimated based on the published market prices for issuances of similar risk and tenor and is categorized as Level 2 within the fair value hierarchy. As of March 31, 2020, the carrying amount and estimated fair value of total debt (before amortization of issuance costs) was $2,694 million and $2,790 million, respectively. As of December 31, 2019, the carrying amount and estimated fair value of total debt (before amortization of issuance costs) was $2,694 million and $2,825 million, respectively. For additional information on our credit facilities, refer to Note 8 – Related Party Debt in the Notes to Consolidated Financial Statements in our 2019 Annual Report. Borrowings and repayments under our credit facilities for the three months ended March 31, 2020 and March 31, 2019 are disclosed in our unaudited consolidated statements of cash flows. See Note 8 – (Deficit) Equity

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
Accumulated Other Comprehensive Loss	Mar. 31, 2020
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive LossAs a result of the acquisition in June 2019, we recorded an accumulated other comprehensive loss related to pension and other post-retirement benefits provided by Explorer and Colonial to their employees. We are not a sponsor of these benefits plans. The acquisition in June 2019 is accounted for as a transaction between entities under common control on a prospective basis and we have recorded the acquisition on our unaudited consolidated balance sheet at SPLC’s historical basis, which included accumulated other comprehensive loss. Our assumption of the accumulated other comprehensive loss balance had no effect on our comprehensive income during the period as the balance was accumulated while under the ownership of SPLC.

(Deficit) Equity

(Deficit) Equity	3 Months Ended
(Deficit) Equity	Mar. 31, 2020
Equity [Abstract]
(Deficit) Equity	(Deficit) Equity Our capital accounts are comprised of 2% general partner interests and 98% limited partner interests. The common units represent limited partner interests in us. The holders of common units, both public and SPLC, are entitled to participate in partnership distributions and have limited rights of ownership as provided for under our partnership agreement. Our general partner participates in our distributions and also, as of March 31, 2020, held IDRs that entitled it to receive increasing percentages of the cash we distribute from operating surplus. Shelf Registrations We have a universal shelf registration statement on Form S-3 on file with the SEC under which we, as a well-known seasoned issuer, have the ability to issue and sell an indeterminate amount of common units and partnership securities representing limited partner units. We also have on file with the SEC a shelf registration statement on Form S-3 relating to $1,000,000,000 of common units and partnership securities representing limited partner units to be used in connection with the “at-the-market” equity distribution program, direct sales, or other sales consistent with the plan of distribution set forth in the registration statement. At-the-Market Program We have an “at-the-market” equity distribution program pursuant to which we may issue and sell common units for up to $300 million in gross proceeds. During both the three months ended March 31, 2020 and March 31, 2019, we did not have any sales under this program. Units Outstanding As of March 31, 2020 and December 31, 2019, we had 233,289,537 common units outstanding, of which 123,832,233 were publicly owned. SPLC owned 109,457,304 common units, representing an aggregate 46% limited partner interest in us, all of the IDRs, and 4,761,012 general partner units, representing a 2% general partner interest in us. Distributions to our Unitholders Under the Second Amendment, our sponsor elected to waive $50 million of IDRs in 2019 to be used for future investment by the Partnership. See Note 2 - Related Party Transactions for terms of the Second Amendment. The following table details the distributions declared and/or paid for the periods presented: Date Paid or Public SPLC General Partner Distributions to be Paid Three Months Ended Common Common IDRs 2% Total (in millions, except per unit amounts) February 14, 2019 December 31, 2018 49 40 37 3 129 $ 0.4000 May 15, 2019 March 31, 2019 (1) 51 42 23 3 119 0.4150 August 14, 2019 June 30, 2019 (1) 53 47 28 3 131 0.4300 November 14, 2019 September 30, 2019 (1) 56 48 33 3 140 0.4450 February 14, 2020 December 31, 2019 57 50 52 3 162 0.4600 May 15, 2020 March 31, 2020 (2) 57 50 52 3 162 0.4600 (1) Includes the impact of waived distributions to the holders of IDRs. See Note 2 — Related Party Transactions for additional information. (2) For more information, see Note 13 — Subsequent Events . Distributions to Noncontrolling Interests Distributions to SPLC for its noncontrolling interest in Zydeco for the three months ended March 31, 2020 and March 31, 2019 were both $1 million, respectively. Distributions to GEL for its noncontrolling interest in Odyssey for the three months ended March 31, 2020 and March 31, 2019 were $4 million and $2 million, respectively. See Note 2—Related Party Transactions

Revenue Recognition

Revenue Recognition	3 Months Ended
Revenue Recognition	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The revenue standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The revenue standard requires entities to recognize revenue through the application of a five-step model, which includes: identification of the contract; identification of the performance obligations; determination of the transaction price; allocation of the transaction price to the performance obligations; and recognition of revenue as the entity satisfies the performance obligations. Disaggregation of Revenue The following table provides information about disaggregated revenue by service type and customer type: Three Months Ended 2020 2019 Transportation services revenue – third parties $ 29 $ 40 Transportation services revenue – related parties (1) 55 50 Storage services revenue – third parties 2 2 Storage services revenue – related parties 2 2 Terminaling services revenue – related parties (2) 12 12 Product revenue – third parties (3) — 1 Product revenue – related parties (3) 7 10 Total Topic 606 revenue 107 117 Lease revenue – related parties 14 14 Total revenue $ 121 $ 131 (1) Transportation services revenue - related parties includes $1 million, respectively, of the non-lease service component in our transportation services contracts for the three months ended March 31, 2020 and March 31, 2019. (2) Terminaling services revenue - related parties is entirely comprised of the non-lease service component in our terminaling services contracts. (3) Product revenue is comprised of allowance oil sales. Lease revenue Certain of our long-term transportation and terminaling services contracts with related parties are accounted for as operating leases. These agreements have both a lease component and an implied operation and maintenance service component (“non-lease service component”). We allocate the arrangement consideration between the lease components and any non-lease service components based on the relative stand-alone selling price of each component. We estimate the stand-alone selling price of the lease and non-lease service components based on an analysis of service-related and lease-related costs for each contract, adjusted for a representative profit margin. The contracts have a minimum fixed monthly payment for both the lease and non-lease service components. We present the non-lease service components under the revenue standard within Transportation, terminaling and storage services – related parties in the unaudited consolidated statements of income. Revenues from the lease components of these agreements are recorded within Lease revenue – related parties in the unaudited consolidated statements of income. Certain of these agreements were entered into for terms of ten years, with the option for the lessee to extend for two additional five one ten Total Less than 1 year Years 2 to 3 Years 4 to 5 More than 5 years Operating leases $ 810 $ 110 $ 219 $ 219 $ 262 Contract Balances The following table provides information about receivables and contract liabilities from contracts with customers: January 1, 2020 March 31, 2020 Receivables from contracts with customers – third parties $ 11 $ 10 Receivables from contracts with customers – related parties 24 27 Deferred revenue – third parties — 1 Deferred revenue – related party — 1 Significant changes in the deferred revenue balances with customers during the period are as follows: December 31, 2019 Additions (1) Reductions (2) March 31, 2020 Deferred revenue – third parties $ — $ 1 $ — $ 1 Deferred revenue – related party — 1 — 1 (1) Contract liability additions resulted from deficiency payments from minimum volume commitment contracts. (2) Contract liability reductions resulted from revenue earned through the actual or estimated use and expiration of deficiency credits. We currently have no assets recognized from the costs to obtain or fulfill a contract as of both March 31, 2020 and December 31, 2019. Remaining Performance Obligations The following table includes revenue expected to be recognized in the future related to performance obligations exceeding one year of their initial terms that are unsatisfied or partially unsatisfied as of March 31, 2020: Total Remainder of 2020 2021 2022 2023 2024 and beyond Revenue expected to be recognized on multi-year committed shipper transportation contracts $ 553 $ 81 $ 63 $ 63 $ 63 $ 283 Revenue expected to be recognized on other multi-year transportation service contracts (1) 39 4 6 6 6 17 Revenue expected to be recognized on multi-year storage service contracts 20 3 4 4 4 5 Revenue expected to be recognized on multi-year terminaling service contracts (1) 366 36 48 48 48 186 $ 978 $ 124 $ 121 $ 121 $ 121 $ 491 (1) Relates to the non-lease service components of certain of our long-term transportation and terminaling service contracts which are accounted for as operating leases. As an exemption under ASC Topic 606, we do not disclose the amount of remaining performance obligations for contracts with an original expected duration of one year or less or for variable consideration that is allocated entirely to a wholly unsatisfied promise to transfer a distinct service that forms part of a single performance obligation.

Net Income Per Limited Partner

Net Income Per Limited Partner Unit	3 Months Ended
Net Income Per Limited Partner Unit	Mar. 31, 2020
Partners' Capital Notes [Abstract]
Net Income Per Limited Partner Unit	Net Income Per Limited Partner Unit Net income per unit applicable to common limited partner units is computed by dividing the respective limited partners’ interest in net income attributable to the Partnership for the period by the weighted average number of common units outstanding for the period. Because we have more than one class of participating securities, we use the two-class method when calculating the net income per unit applicable to limited partners. The classes of participating securities include common units, general partner units and IDRs. Basic and diluted net income per unit are the same because we do not have any potentially dilutive units outstanding for the periods presented. Net income earned by the Partnership is allocated between the limited partners and the general partner (including IDRs) in accordance with our partnership agreement. Earnings are allocated based on actual cash distributions declared to our unitholders, including those attributable to IDRs. To the extent net income attributable to the Partnership exceeds or is less than cash distributions, this difference is allocated based on the unitholders’ respective ownership percentages. The following tables show the allocation of net income attributable to the Partnership to arrive at net income per limited partner unit: Three Months Ended 2020 2019 Net income $ 142 $ 137 Less: Net income attributable to noncontrolling interests 4 5 Net income attributable to the Partnership 138 132 Less: General partner’s distribution declared (1) 55 26 Limited partners’ distribution declared on common units 107 93 Income (less than)/in excess of distributions $ (24) $ 13 (1) For the three months ended March 31, 2019, this includes the impact of waived distributions to the holders of IDRs. See Note 2 — Related Party Transactions for additional information. Three Months Ended March 31, 2020 General Partner Limited Partners’ Common Units Total (in millions of dollars, except per unit data) Distributions declared $ 55 $ 107 $ 162 Income less than distributions — (24) (24) Net income attributable to the Partnership $ 55 $ 83 $ 138 Weighted average units outstanding: Basic and diluted 233.3 Net income per limited partner unit: Basic and diluted $ 0.36 Three Months Ended March 31, 2019 General Partner Limited Partners’ Common Units Total (in millions of dollars, except per unit data) Distributions declared (1) $ 26 $ 93 $ 119 Income in excess of distributions 1 12 13 Net income attributable to the Partnership $ 27 $ 105 $ 132 Weighted average units outstanding: Basic and diluted 223.8 Net income per limited partner unit: Basic and diluted $ 0.47 (1) This includes the impact of waived distributions to the holders of IDRs. See Note 2 — Related Party Transactions for additional information.

Income Taxes

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We are not a taxable entity for U.S. federal income tax purposes or for the majority of states that impose an income tax. Taxes on our net income are generally borne by our partners through the allocation of taxable income. Our income tax expense results from partnership activity in the state of Texas, as conducted by Zydeco, Sand Dollar and Triton. Income tax expense for both the three months ended March 31, 2020 and March 31, 2019 was not material. With the exception of the operations of Colonial, Explorer and LOCAP, which are treated as corporations for federal income tax purposes, the operations of the Partnership are not subject to federal income tax.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental Matters We are subject to federal, state and local environmental laws and regulations. We routinely conduct reviews of potential environmental issues and claims that could impact our assets or operations. These reviews assist us in identifying environmental issues and estimating the costs and timing of remediation efforts. In making environmental liability estimations, we consider the material effect of environmental compliance, pending legal actions against us and potential third-party liability claims. Often, as the remediation evaluation and effort progresses, additional information is obtained, requiring revisions to estimated costs. These revisions are reflected in income in the period in which they are probable and reasonably estimable. As of both March 31, 2020 and December 31, 2019, these costs and any related liabilities are not material. Legal Proceedings We are named defendants in lawsuits and governmental proceedings that arise in the ordinary course of business. For each of our outstanding legal matters, we evaluate the merits of the case, our exposure to the matter, possible legal or settlement strategies and the likelihood of an unfavorable outcome. While there are still uncertainties related to the ultimate costs we may incur, based upon our evaluation and experience to date, we do not expect that the ultimate resolution of these matters will have a material adverse effect on our financial position, operating results or cash flows. Indemnification Under the 2019 Omnibus Agreement, certain tax liabilities are indemnified by SPLC. See Note 2—Related Party Transactions for additional information. Minimum Throughput On September 1, 2016, the in-service date of the finance lease for the Port Neches storage tanks, a joint tariff agreement with a third party became effective. The tariff is reviewed annually and the rate updated based on the Federal Energy Regulatory Commission (“FERC”) indexing adjustment effective July 1 of each year. Effective July 1, 2019, there was an approximately 4.3% increase to this rate based on FERC indexing adjustment. The initial term of the agreement is ten years with automatic one year renewal terms with the option to cancel prior to each renewal period. Other Commitments Odyssey entered into a tie-in agreement effective January 2012 with a third party, which allowed producers to install the tie-in connection facilities and tying into the system. The agreement will continue to be in effect until the continued operation of the platform is uneconomic. We hold cancellable easements or rights-of-way arrangements from landowners permitting the use of land for the construction and operation of our pipeline systems. Obligations under these easements are not material to the results of our operations. Leases We have operating leases for land, a lease of platform space and finance leases for storage tanks and platform space.

Subsequent Events

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events We have evaluated events that have occurred after March 31, 2020 through the issuance of these unaudited consolidated financial statements. Any material subsequent events that occurred during this time have been properly recognized or disclosed in the unaudited consolidated financial statements and accompanying notes. Distribution On April 22, 2020, the Board declared a cash distribution of $0.4600 per limited partner unit for the three months ended March 31, 2020. The distribution will be paid on May 15, 2020 to unitholders of record as of May 5, 2020. Pursuant to the terms of the Partnership Interests Restructuring Agreement (defined below), our general partner or its assignee is entitled to any and all payments with respect to the IDRs that would have been payable to the general partner for the first quarter of 2020, regardless of whether the IDRs were outstanding on the record date for the distribution with respect to such quarter . In addition, the general partner or its assignee agreed to waive in full any and all of the rights, claims and interest in distributions for the first quarter of 2020 that it would otherwise be entitled to receive with respect to the 160,000,000 common units received pursuant to the Partnership Interests Restructuring Agreement. Purchase and Sale Agreement and Partnership Interests Restructuring Agreement On April 1, 2020, we closed the following transactions pursuant to the Purchase and Sale Agreement dated as of February 27, 2020 (the “Purchase and Sale Agreement”) by and among the Partnership, Triton and SPLC, Shell GOM Pipeline Company LLC (“SGOM”), Shell Chemical LP (“Shell Chemical”), and Equilon Enterprises LLC d/b/a Shell Oil Products US (“SOPUS”): i. We acquired 79% of the issued and outstanding membership interests in Mattox Pipeline Company LLC, from SGOM. The acquisition will be accounted for as a transaction between entities under common control on a prospective basis as an asset acquisition. As such, we will record the acquired equity interests at SPLC’s historical carrying value, which will be included in Equity method investments in our unaudited consolidated balance sheet as of June 30, 2020. ii. SOPUS and Shell Chemical transferred to Triton, as a designee of the Partnership, certain logistics assets at the Shell Norco Manufacturing Complex located in Norco, Louisiana, which are comprised of crude, chemicals, intermediate and finished product pipelines, storage tanks, docks, truck and rail racks and supporting infrastructure. Triton also entered into terminaling services agreements with SOPUS and Shell Chemical related to these logistic assets. The purchase of the assets combined with the terminaling services agreements will be accounted for as a failed sale leaseback under ASC Topic 842, Leases. As a result, the transaction will be treated as a financing arrangement in which financing receivables from SOPUS and Shell Chemical will be recognized in a contra-equity account on April 1, 2020. As such, no property, plant and equipment will be recognized. The Partnership will receive annual payments of $151 million which will be recognized as transportation, terminaling and storage services revenue, a reduction of the financing receivables and related interest income. The annual payments are subject to annual Consumer Price Index adjustments. On April 1, 2020, simultaneously with the closing of the transactions described above, we also closed the transactions contemplated by a Partnership Interests Restructuring Agreement with our general partner dated as of February 27, 2020 (the “Partnership Interests Restructuring Agreement”), which included the elimination of all the IDRs and the economic general partner interest in the Partnership and the amendment and restatement of our partnership agreement, effective as of April 1, 2020 (as so amended, the “Second Amended and Restated Partnership Agreement”). As consideration for the transferred assets described in clauses i. and ii. above, and the elimination of the IDRs and the economic general partner interest, our sponsor received 160,000,000 newly issued common units, plus 50,782,904 Series A perpetual convertible preferred units (the “Series A Preferred Units”) which are entitled to receive a quarterly distribution of $0.2363 per unit. Upon the closing of the transaction, the Partnership has 393,289,537 common units outstanding, of which SPLC’s wholly owned subsidiary, Shell Midstream LP Holdings LLC, owns 269,457,304 common units in the Partnership, representing an aggregate 68.5% limited partner interest. The Series A Preferred Units are a new class of security that rank senior to all common units with respect to distribution rights and rights upon liquidation. The Series A Preferred Units have voting rights, distribution rights and certain redemption rights, and are also convertible (at the option of the Partnership and at the option of the holder, in each case under certain circumstances) and are otherwise subject to the terms and conditions as set forth in the Second Amended and Restated Partnership Agreement. Pursuant to the Partnership Interests Restructuring Agreement, the general partner or its assignee, has agreed to waive a portion of the distributions that would otherwise be payable on the common units issued to the sponsor (in part as designee of the general partner) as part of the foregoing transactions in an amount of $20 million per quarter for four consecutive fiscal quarters, to begin with the distribution made with respect to the second quarter of 2020.

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business We own, operate, develop and acquire pipelines and other midstream assets. As of March 31, 2020, our assets include interests in entities that own crude oil and refined products pipelines and terminals that serve as key infrastructure to (i) transport onshore and offshore crude oil production to Gulf Coast and Midwest refining markets and (ii) deliver refined products from those markets to major demand centers. Our assets also include interests in entities that own natural gas and refinery gas pipelines that transport offshore natural gas to market hubs and deliver refinery gas from refineries and plants to chemical sites along the Gulf Coast.
Basis of Presentation	Basis of Presentation Our unaudited consolidated financial statements include all subsidiaries required to be consolidated under generally accepted accounting principles in the United States (“GAAP”). Our reporting currency is U.S. dollars, and all references to dollars are U.S. dollars. The accompanying unaudited consolidated financial statements and related notes have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation
Allowance for Expected Credit Losses	Allowance for Expected Credit Losses Accounts receivable represent valid claims against customers for products sold or services rendered, net of allowances for doubtful accounts. We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate. We establish provisions for losses on third party accounts receivable due from shippers and operators based on current expected credit losses. As of March 31, 2020 and December 31, 2019, we did not have a material amount of allowance for doubtful accounts.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Standards Adopted as of January 1, 2020 In June 2016, the FASB issued ASU 2016-13 to Topic 326, Financial Instruments — Credit Losses: Measurement of Credit Losses on Financial Instruments, which replaces the current incurred loss impairment method with a method that reflects expected credit losses on financial instruments. The measurement of current expected credit losses under the new guidance is applicable to financial assets measured at amortized cost, including third-party trade receivables. We adopted the new standard effective January 1, 2020 using the modified retrospective method for all financial assets measured. No cumulative-effect adjustment to retained earnings was required upon adoption. The adoption of ASU 2016-13 did not have a material impact on our consolidated financial statements.

Description of Business and B_3

Description of Business and Basis of Presentation (Tables)	3 Months Ended
Description of Business and Basis of Presentation (Tables)	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Ownership Percentage	The following table reflects our ownership interests as of March 31, 2020: SHLX Ownership Pecten Midstream LLC (“Pecten”) 100.0 % Sand Dollar Pipeline LLC (“Sand Dollar”) 100.0 % Triton West LLC (“Triton”) 100.0 % Zydeco Pipeline Company LLC (“Zydeco”) (1) 92.5 % Amberjack Pipeline Company LLC (“Amberjack”) – Series A/Series B 75.0% / 50.0% Mars Oil Pipeline Company LLC (“Mars”) 71.5 % Odyssey Pipeline L.L.C. (“Odyssey”) 71.0 % Bengal Pipeline Company LLC (“Bengal”) 50.0 % Crestwood Permian Basin LLC (“Permian Basin”) 50.0 % LOCAP LLC (“LOCAP”) 41.48 % Explorer Pipeline Company (“Explorer”) 38.59 % Poseidon Oil Pipeline Company, L.L.C. (“Poseidon”) 36.0 % Colonial Enterprises, Inc. (“Colonial”) 16.125 % Proteus Oil Pipeline Company, LLC (“Proteus”) 10.0 % Endymion Oil Pipeline Company, LLC (“Endymion”) 10.0 % Cleopatra Gas Gathering Company, LLC (“Cleopatra”) 1.0 % (1) SPLC owns the remaining 7.5% ownership interest in Zydeco.

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
Related Party Transactions (Tables)	Mar. 31, 2020
Related Party Transactions [Abstract]
Schedule of Other Related Party Balances	Other related party balances consist of the following: March 31, 2020 December 31, 2019 Accounts receivable $ 32 $ 29 Prepaid expenses 11 15 Other assets 2 2 Accounts payable (1) 8 10 Deferred revenue 1 — Accrued liabilities (2) 17 19 Debt payable (3) 2,692 2,692 (1) Accounts payable reflects amounts owed to SPLC for reimbursement of third-party expenses incurred by SPLC for our benefit. (2) As of March 31, 2020, Accrued liabilities reflects $17 million accrued interest. As of December 31, 2019, Accrued liabilities reflects $18 million accrued interest and $1 million other accrued liabilities. (3) Debt payable reflects borrowings outstanding after taking into account unamortized debt issuance costs of $2 million as of both March 31, 2020 and December 31, 2019.
Schedule of Related Party Expenses Including Personnel Costs	The following table shows related party expenses, including certain personnel costs, incurred by Shell and SPLC on our behalf that are reflected in the accompanying unaudited consolidated statements of income for the indicated periods. Included in these amounts, and disclosed below, is our share of operating and general corporate expenses, as well as the fees paid to SPLC under certain agreements. Three Months Ended March 31, 2020 2019 Allocated operating expenses $ 4 $ 5 Insurance expense (1) 5 4 Other (2) 5 5 Operations and maintenance – related parties $ 14 $ 14 Allocated general corporate expenses $ 7 $ 6 Management Agreement fee 2 2 Omnibus Agreement fee 3 3 General and administrative – related parties $ 12 $ 11 (1) The majority of our insurance coverage is provided by a wholly owned subsidiary of Shell. The remaining coverage is provided by third-party insurers. (2) Other expenses primarily relate to salaries and wages and other payroll expenses.
Schedule of Reimbursements from Parent

Equity Method Investments (Tabl

Equity Method Investments (Tables)	3 Months Ended
Equity Method Investments (Tables)	Mar. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Investments in Affiliates	Equity method investments comprise the following as of the dates indicated: March 31, 2020 December 31, 2019 Ownership Investment Amount Ownership Investment Amount Amberjack – Series A / Series B 75.0% / 50.0% $ 418 75.0% / 50.0% $ 426 Mars 71.5% 160 71.5% 161 Bengal 50.0% 87 50.0% 88 Permian Basin 50.0% 90 50.0% 91 LOCAP 41.48% 9 41.48% 9 Explorer 38.59% 85 38.59% 88 Poseidon 36.0% — 36.0% — Colonial 16.125% 30 16.125% 30 Proteus 10.0% 15 10.0% 15 Endymion 10.0% 18 10.0% 18 $ 912 $ 926
Schedule of Equity Investments in Affiliates Balance Affected	Earnings from our equity method investments were as follows during the periods indicated: Three Months Ended March 31, 2020 2019 Amberjack $ 29 $ 32 Mars 31 29 Bengal 5 5 Explorer (1) 14 — Colonial (1) 27 — Other (2) 6 4 $ 112 $ 70 (1) We acquired additional interests in Explorer and Colonial in June 2019. The acquisition of these interests has been accounted for prospectively.
Summary of Income Statement Data for Equity Method Investments	The following tables present aggregated selected unaudited income statement data for our equity method investments on a 100% basis. However, during periods in which an acquisition occurs, the selected unaudited income statement data reflects activity from the date of the acquisition. Three Months Ended March 31, 2020 Total revenues Total operating expenses Operating income Net income Statements of Income Amberjack $ 76 $ 19 $ 57 $ 57 Mars 72 28 44 44 Bengal 17 7 10 10 Explorer 96 47 49 38 Colonial 401 163 238 169 Poseidon 33 9 24 22 Other (1) 57 27 30 25 (1) Included in Other is the activity associated with our investments in Permian Basin, LOCAP, Proteus and Endymion. Three Months Ended March 31, 2019 Total revenues Total operating expenses Operating income Net income Statements of Income Amberjack $ 81 $ 19 $ 62 $ 62 Mars 63 22 41 41 Bengal 18 7 11 11 Poseidon 31 9 22 20 Other (1) 30 18 12 9

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	3 Months Ended
Property, Plant and Equipment (Tables)	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Components of Property, Plant and Equipment	Property, plant and equipment consist of the following as of the dates indicated: Depreciable March 31, 2020 December 31, 2019 Land — $ 11 $ 11 Building and improvements 10 - 40 years 40 40 Pipeline and equipment (1) 10 - 30 years 1,245 1,228 Other 5 - 25 years 33 33 1,329 1,312 Accumulated depreciation and amortization (2) (626) (613) 703 699 Construction in progress 14 27 Property, plant and equipment, net $ 717 $ 726 (1) As of both March 31, 2020 and December 31, 2019, includes costs of $369 million, related to assets under operating lease (as lessor). As of both March 31, 2020 and December 31, 2019, includes cost of $23 million, related to right-of-use (“ROU”) assets under finance lease (as lessee). (2) As of March 31, 2020 and December 31, 2019, includes accumulated depreciation of $136 million and $133 million, respectively, related to assets under operating lease (as lessor). As of March 31, 2020 and December 31, 2019, includes accumulated amortization of $7 million and $6 million, respectively, related to ROU assets under finance lease (as lessee).

Accrued Liabilities - Third P_2

Accrued Liabilities - Third Parties (Tables)	3 Months Ended
Accrued Liabilities - Third Parties (Tables)	Mar. 31, 2020
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities – third parties consist of the following as of the dates indicated: March 31, 2020 December 31, 2019 Project accruals $ 4 $ 5 Property taxes 5 4 Other accrued liabilities 3 3 Accrued liabilities – third parties $ 12 $ 12

Related Party Debt (Tables)

Related Party Debt (Tables)	3 Months Ended
Related Party Debt (Tables)	Mar. 31, 2020
Debt Disclosure [Abstract]
Schedule of Consolidated Related Party Debt Obligations	Consolidated related party debt obligations comprise the following as of the dates indicated: March 31, 2020 December 31, 2019 Outstanding Balance Total Capacity Available Capacity Outstanding Balance Total Capacity Available Capacity Ten Year Fixed Facility $ 600 $ 600 $ — $ 600 $ 600 $ — Seven Year Fixed Facility 600 600 — 600 600 — Five Year Revolver due July 2023 494 760 266 494 760 266 Five Year Revolver due December 2022 400 1,000 600 400 1,000 600 Five Year Fixed Facility 600 600 — 600 600 — 2019 Zydeco Revolver — 30 30 — 30 30 Unamortized debt issuance costs (2) n/a n/a (2) n/a n/a Debt payable – related party $ 2,692 $ 3,590 $ 896 $ 2,692 $ 3,590 $ 896

(Deficit) Equity (Tables)

(Deficit) Equity (Tables)	3 Months Ended
(Deficit) Equity (Tables)	Mar. 31, 2020
Equity [Abstract]
Schedule of Distributions Declared and/or Paid	The following table details the distributions declared and/or paid for the periods presented: Date Paid or Public SPLC General Partner Distributions to be Paid Three Months Ended Common Common IDRs 2% Total (in millions, except per unit amounts) February 14, 2019 December 31, 2018 49 40 37 3 129 $ 0.4000 May 15, 2019 March 31, 2019 (1) 51 42 23 3 119 0.4150 August 14, 2019 June 30, 2019 (1) 53 47 28 3 131 0.4300 November 14, 2019 September 30, 2019 (1) 56 48 33 3 140 0.4450 February 14, 2020 December 31, 2019 57 50 52 3 162 0.4600 May 15, 2020 March 31, 2020 (2) 57 50 52 3 162 0.4600 (1) Includes the impact of waived distributions to the holders of IDRs. See Note 2 — Related Party Transactions for additional information. (2) For more information, see Note 13 — Subsequent Events .

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
Revenue Recognition (Tables)	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table provides information about disaggregated revenue by service type and customer type: Three Months Ended 2020 2019 Transportation services revenue – third parties $ 29 $ 40 Transportation services revenue – related parties (1) 55 50 Storage services revenue – third parties 2 2 Storage services revenue – related parties 2 2 Terminaling services revenue – related parties (2) 12 12 Product revenue – third parties (3) — 1 Product revenue – related parties (3) 7 10 Total Topic 606 revenue 107 117 Lease revenue – related parties 14 14 Total revenue $ 121 $ 131 (1) Transportation services revenue - related parties includes $1 million, respectively, of the non-lease service component in our transportation services contracts for the three months ended March 31, 2020 and March 31, 2019. (2) Terminaling services revenue - related parties is entirely comprised of the non-lease service component in our terminaling services contracts. (3) Product revenue is comprised of allowance oil sales.
Operating Lease, Lease Income	As of March 31, 2020, future minimum payments of both the lease and service components to be received under the initial ten Total Less than 1 year Years 2 to 3 Years 4 to 5 More than 5 years Operating leases $ 810 $ 110 $ 219 $ 219 $ 262
Contract Balances	The following table provides information about receivables and contract liabilities from contracts with customers: January 1, 2020 March 31, 2020 Receivables from contracts with customers – third parties $ 11 $ 10 Receivables from contracts with customers – related parties 24 27 Deferred revenue – third parties — 1 Deferred revenue – related party — 1 Significant changes in the deferred revenue balances with customers during the period are as follows: December 31, 2019 Additions (1) Reductions (2) March 31, 2020 Deferred revenue – third parties $ — $ 1 $ — $ 1 Deferred revenue – related party — 1 — 1 (1) Contract liability additions resulted from deficiency payments from minimum volume commitment contracts.
Remaining Performance Obligations	The following table includes revenue expected to be recognized in the future related to performance obligations exceeding one year of their initial terms that are unsatisfied or partially unsatisfied as of March 31, 2020: Total Remainder of 2020 2021 2022 2023 2024 and beyond Revenue expected to be recognized on multi-year committed shipper transportation contracts $ 553 $ 81 $ 63 $ 63 $ 63 $ 283 Revenue expected to be recognized on other multi-year transportation service contracts (1) 39 4 6 6 6 17 Revenue expected to be recognized on multi-year storage service contracts 20 3 4 4 4 5 Revenue expected to be recognized on multi-year terminaling service contracts (1) 366 36 48 48 48 186 $ 978 $ 124 $ 121 $ 121 $ 121 $ 491 (1) Relates to the non-lease service components of certain of our long-term transportation and terminaling service contracts which are accounted for as operating leases. As an exemption under ASC Topic 606, we do not disclose the amount of remaining performance obligations for contracts with an original expected duration of one year or less or for variable consideration that is allocated entirely to a wholly unsatisfied promise to transfer a distinct service that forms part of a single performance obligation.

Net Income Per Limited Partne_2

Net Income Per Limited Partner Unit (Tables)	3 Months Ended
Net Income Per Limited Partner Unit (Tables)	Mar. 31, 2020
Partners' Capital Notes [Abstract]
Schedule of Allocation of Net Income Attributable to the Partnership to Arrive at Net Income Per Limited Partner Unit	The following tables show the allocation of net income attributable to the Partnership to arrive at net income per limited partner unit: Three Months Ended 2020 2019 Net income $ 142 $ 137 Less: Net income attributable to noncontrolling interests 4 5 Net income attributable to the Partnership 138 132 Less: General partner’s distribution declared (1) 55 26 Limited partners’ distribution declared on common units 107 93 Income (less than)/in excess of distributions $ (24) $ 13 (1) For the three months ended March 31, 2019, this includes the impact of waived distributions to the holders of IDRs. See Note 2 — Related Party Transactions for additional information.
Schedule of Basic and Diluted Net Income Per Unit	Three Months Ended March 31, 2020 General Partner Limited Partners’ Common Units Total (in millions of dollars, except per unit data) Distributions declared $ 55 $ 107 $ 162 Income less than distributions — (24) (24) Net income attributable to the Partnership $ 55 $ 83 $ 138 Weighted average units outstanding: Basic and diluted 233.3 Net income per limited partner unit: Basic and diluted $ 0.36 Three Months Ended March 31, 2019 General Partner Limited Partners’ Common Units Total (in millions of dollars, except per unit data) Distributions declared (1) $ 26 $ 93 $ 119 Income in excess of distributions 1 12 13 Net income attributable to the Partnership $ 27 $ 105 $ 132 Weighted average units outstanding: Basic and diluted 223.8 Net income per limited partner unit: Basic and diluted $ 0.47 (1) This includes the impact of waived distributions to the holders of IDRs. See Note 2 — Related Party Transactions for additional information.

Description of Business and B_4

Description of Business and Basis of Presentation (Details) - segment	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Description Of Business And Basis Of Presentation [Line Items]
Number of reportable segments	1
Pecten Midstream LLC (“Pecten”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	100.00%
Sand Dollar Pipeline LLC (“Sand Dollar”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	100.00%
Triton West LLC (“Triton”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	100.00%
Zydeco Pipeline Company LLC (“Zydeco”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	92.50%
Zydeco Pipeline Company LLC (“Zydeco”) \| Zydeco Pipeline Company LLC (“Zydeco”)
Description Of Business And Basis Of Presentation [Line Items]
Shell’s Retained Ownership	7.50%
Amberjack Pipeline Company LLC (“Amberjack”) - Series A
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	75.00%	75.00%
Amberjack Pipeline Company LLC (“Amberjack”) - Series B
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	50.00%	50.00%
Mars Oil Pipeline Company LLC (“Mars”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	71.50%	71.50%
Odyssey Pipeline L.L.C. (“Odyssey”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	71.00%
Bengal Pipeline Company LLC (“Bengal”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	50.00%	50.00%
Crestwood Permian Basin LLC (“Permian Basin”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	50.00%	50.00%
LOCAP LLC (“LOCAP”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	41.48%	41.48%
Explorer Pipeline Company ("Explorer")
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	38.59%	38.59%
Poseidon Oil Pipeline Company LLC (“Poseidon”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	36.00%	36.00%
Colonial Pipeline Company (“Colonial”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	16.125%	16.125%
Proteus Oil Pipeline Company, LLC (“Proteus”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	10.00%	10.00%
Endymion Oil Pipeline Company, LLC (“Endymion”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	10.00%	10.00%
Cleopatra Gas Gathering Company, LLC (“Cleopatra”)
Description Of Business And Basis Of Presentation [Line Items]
SHLX Ownership	1.00%

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) $ in Millions	Nov. 03, 2014USD ($)	Mar. 31, 2020USD ($)termcredit_facility	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Related Party Transaction [Line Items]
Statute of limitations expirations, number of days	60 days
Distributions to holders of incentive distribution rights waived		$ 16	$ 17	$ 17			$ 50
Health and life insurance costs		2			$ 2
Defined contribution benefit plan costs		$ 1			$ 1
Transportation Services Operating Leases
Related Party Transaction [Line Items]
Initial term		10 years
Transportation Services Operating Leases, Five Year Terms
Related Party Transaction [Line Items]
Initial term		10 years
Number of additional terms \| term		2
Additional term		5 years
Transportation Services Operating Leases, One Year Terms
Related Party Transaction [Line Items]
Initial term		10 years
Number of additional terms \| term		10
Additional term		1 year
Shell Treasury Center West Inc
Related Party Transaction [Line Items]
Number of revolving credit facilities \| credit_facility		5
Five Year Fixed Facility \| Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term		5 years
Five Year Fixed Facility \| Shell Treasury Center West Inc \| Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term		5 years
Five Year Revolver Due December 2022 \| Shell Treasury Center West Inc \| Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term		5 years
Seven Year Fixed Facility \| Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term		7 years
Seven Year Fixed Facility \| Shell Treasury Center West Inc \| Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term		7 years
Ten Year Fixed Facility \| Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term		10 years
Ten Year Fixed Facility \| Shell Treasury Center West Inc \| Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term		10 years
Shell Pipeline Company L P
Related Party Transaction [Line Items]
Payment of general and administrative fee	$ 11
Odyssey Pipeline L.L.C. (“Odyssey”) \| GEL Offshore Pipeline LLC
Related Party Transaction [Line Items]
Noncontrolling interest		29.00%	29.00%				29.00%
Zydeco Pipeline Company LLC (“Zydeco”) \| Shell Pipeline Company L P
Related Party Transaction [Line Items]
Noncontrolling interest		7.50%	7.50%				7.50%
Scenario, Forecast
Related Party Transaction [Line Items]
Distributions to holders of incentive distribution rights waived						$ 50

Related Party Transactions - Sc

Related Party Transactions - Schedule of Other Related Party Balances (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Accounts receivable	$ 32	$ 29
Prepaid expenses	11	15
Other assets	2	2
Accounts payable	8	10
Deferred revenue	1	0
Accrued liabilities	17	19
Debt payable	2,692	2,692
Accrued interest, related parties	17	18
Other accrued liabilities, related parties		1
Unamortized debt issuance costs	2	2
Affiliated Entity
Related Party Transaction [Line Items]
Unamortized debt issuance costs	$ 2	$ 2

Related Party Transactions - Re

Related Party Transactions - Related Party Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Related Party Transaction [Line Items]
Lease revenue – related parties	$ 14	$ 14

Related Party Transactions - _2

Related Party Transactions - Schedule of Condensed Combined Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Related Party Transactions [Abstract]
Allocated operating expenses	$ 4	$ 5
Insurance expense	5	4
Other	5	5
Operations and maintenance – related parties	14	14
Allocated general corporate expenses	7	6
Management Agreement fee	2	2
Omnibus Agreement fee	3	3
General and administrative – related parties	$ 12	$ 11

Related Party Transactions - _3

Related Party Transactions - Reimbursements from Our General Partner (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Shell Pipeline Company L P
Related Party Transaction [Line Items]
Total reimbursement received	$ 7

Equity Method Investments - Sch

Equity Method Investments - Schedule of Equity Investments in Affiliates (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment Amount	$ 912,000,000	$ 926,000,000
Amberjack – Series A / Series B
Schedule of Equity Method Investments [Line Items]
Investment Amount	$ 418,000,000	$ 426,000,000
Amberjack - Series A
Schedule of Equity Method Investments [Line Items]
Ownership	75.00%	75.00%
Amberjack - Series B
Schedule of Equity Method Investments [Line Items]
Ownership	50.00%	50.00%
Mars
Schedule of Equity Method Investments [Line Items]
Ownership	71.50%	71.50%
Investment Amount	$ 160,000,000	$ 161,000,000
Bengal
Schedule of Equity Method Investments [Line Items]
Ownership	50.00%	50.00%
Investment Amount	$ 87,000,000	$ 88,000,000
Crestwood Permian Basin LLC (“Permian Basin”)
Schedule of Equity Method Investments [Line Items]
Ownership	50.00%	50.00%
Investment Amount	$ 90,000,000	$ 91,000,000
LOCAP
Schedule of Equity Method Investments [Line Items]
Ownership	41.48%	41.48%
Investment Amount	$ 9,000,000	$ 9,000,000
Explorer
Schedule of Equity Method Investments [Line Items]
Ownership	38.59%	38.59%
Investment Amount	$ 85,000,000	$ 88,000,000
Poseidon
Schedule of Equity Method Investments [Line Items]
Ownership	36.00%	36.00%
Investment Amount	$ 0	$ 0	$ 0
Colonial Pipeline Company (“Colonial”)
Schedule of Equity Method Investments [Line Items]
Ownership	16.125%	16.125%
Investment Amount	$ 30,000,000	$ 30,000,000
Proteus
Schedule of Equity Method Investments [Line Items]
Ownership	10.00%	10.00%
Investment Amount	$ 15,000,000	$ 15,000,000
Endymion
Schedule of Equity Method Investments [Line Items]
Ownership	10.00%	10.00%
Investment Amount	$ 18,000,000	$ 18,000,000

Equity Method Investments - Add

Equity Method Investments - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Unamortized basis differences included in equity investments	$ 90,000,000		$ 92,000,000
Amortization expense (income)	2,000,000	$ 1,000,000
Equity method investments	912,000,000		926,000,000
Cumulative effect to total (deficit)/equity				$ 9,000,000
Poseidon
Schedule of Equity Method Investments [Line Items]
Equity method investments	0		0		$ 0
Investment, excess distribution	9,000,000	8,000,000
Mars
Schedule of Equity Method Investments [Line Items]
Equity method investments	160,000,000		161,000,000
Amberjack – Series A / Series B
Schedule of Equity Method Investments [Line Items]
Equity method investments	418,000,000		426,000,000
Amberjack – Series A / Series B \| Accounting Standards Update 2014-09
Schedule of Equity Method Investments [Line Items]
Cumulative effect to total (deficit)/equity				$ 9,000,000
Crestwood Permian Basin LLC (“Permian Basin”)
Schedule of Equity Method Investments [Line Items]
Equity method investments	90,000,000		$ 91,000,000
Capital contribution	$ 0	$ 5,000,000

Equity Method Investments - Sum

Equity Method Investments - Summary of Income Statement Data for Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 112	$ 70
Total revenue	121	131
Operating income	45	65
Amberjack
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	29	32
Total Revenues	76	81
Total Operating Expenses	19	19
Operating Income	57	62
Net Income	57	62
Mars
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	31	29
Total Revenues	72	63
Total Operating Expenses	28	22
Operating Income	44	41
Net Income	44	41
Bengal
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	5	5
Total Revenues	17	18
Total Operating Expenses	7	7
Operating Income	10	11
Net Income	10	11
Explorer
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	14	0
Total Revenues	96
Total Operating Expenses	47
Operating Income	49
Net Income	38
Colonial Pipeline Company (“Colonial”)
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	27	0
Total Revenues	401
Total Operating Expenses	163
Operating Income	238
Net Income	169
Poseidon
Schedule of Equity Method Investments [Line Items]
Total Revenues	33	31
Total Operating Expenses	9	9
Operating Income	24	22
Net Income	22	20
Other
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	6	4
Total Revenues	57	30
Total Operating Expenses	27	18
Operating Income	30	12
Net Income	$ 25	$ 9

Property, Plant and Equipment -

Property, Plant and Equipment - Components of Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Land	$ 11		$ 11
Building and improvements	40		40
Pipeline and equipment	1,245		1,228
Other	33		33
Property, plant and equipment, gross	1,329		1,312
Accumulated depreciation and amortization	(626)		(613)
Property plant and equipment excluding construction in progress	703		699
Construction in progress	14		27
Property, plant and equipment, net	717		726
Operating lease, accumulated depreciation	136		133
Finance lease, accumulated depreciation	7		6
Depreciation and amortization expense	$ 13	$ 12
Building and Improvements \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life	10 years
Building and Improvements \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life	40 years
Pipeline and Equipment
Property Plant And Equipment [Line Items]
Operating lease cost	$ 369		369
Finance lease cost	$ 23		$ 23
Pipeline and Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life	10 years
Pipeline and Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life	30 years
Other \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life	5 years
Other \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life	25 years

Accrued Liabilities - Third P_3

Accrued Liabilities - Third Parties - Schedule of Accrued Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Project accruals	$ 4	$ 5
Property taxes	5	4
Other accrued liabilities	3	3
Accrued liabilities – third parties	$ 12	$ 12

Related Party Debt - Schedule o

Related Party Debt - Schedule of Consolidated Related Party Debt Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Line Of Credit Facility [Line Items]
Outstanding Balance	$ 2,692	$ 2,692
Unamortized debt issuance costs	(2)	(2)
Total Capacity	3,590	3,590
Available Capacity	$ 896	896
Revolving Credit Facility \| Ten Year Fixed Facility
Line Of Credit Facility [Line Items]
Debt instrument term	10 years
Outstanding Balance	$ 600	600
Total Capacity	600	600
Available Capacity	$ 0	0
Revolving Credit Facility \| Ten Year Fixed Facility \| Shell Treasury Center West Inc
Line Of Credit Facility [Line Items]
Debt instrument term	10 years
Revolving Credit Facility \| Seven Year Fixed Facility
Line Of Credit Facility [Line Items]
Debt instrument term	7 years
Outstanding Balance	$ 600	600
Total Capacity	600	600
Available Capacity	$ 0	0
Revolving Credit Facility \| Seven Year Fixed Facility \| Shell Treasury Center West Inc
Line Of Credit Facility [Line Items]
Debt instrument term	7 years
Revolving Credit Facility \| Five Year Revolver due July 2023
Line Of Credit Facility [Line Items]
Debt instrument term	5 years
Outstanding Balance	$ 494	494
Total Capacity	760	760
Available Capacity	$ 266	266
Revolving Credit Facility \| Five Year Revolver due December 2022
Line Of Credit Facility [Line Items]
Debt instrument term	5 years
Outstanding Balance	$ 400	400
Total Capacity	1,000	1,000
Available Capacity	$ 600	600
Revolving Credit Facility \| Five Year Fixed Facility
Line Of Credit Facility [Line Items]
Debt instrument term	5 years
Outstanding Balance	$ 600	600
Total Capacity	600	600
Available Capacity	$ 0	0
Revolving Credit Facility \| Five Year Fixed Facility \| Shell Treasury Center West Inc
Line Of Credit Facility [Line Items]
Debt instrument term	5 years
Revolving Credit Facility \| 2019 Zydeco Revolver
Line Of Credit Facility [Line Items]
Outstanding Balance	$ 0	0
Total Capacity	30	30
Available Capacity	$ 30	$ 30

Related Party Debt - Additional

Related Party Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Line Of Credit Facility [Line Items]
Interest and fee expenses	$ 24	$ 20
Interest paid	25	$ 20
Long-term debt, carrying value	2,694		$ 2,694
Long-term debt, fair value	2,790		2,825
Borrowing capacity	3,590		3,590
Ten Year Fixed Facility \| Revolving Credit Facility
Line Of Credit Facility [Line Items]
Borrowing capacity	600		600
Five Year Revolver due July 2023 \| Revolving Credit Facility
Line Of Credit Facility [Line Items]
Borrowing capacity	760		760
Seven Year Fixed Facility \| Revolving Credit Facility
Line Of Credit Facility [Line Items]
Borrowing capacity	$ 600		$ 600

(Deficit) Equity (Details)

(Deficit) Equity (Details) - USD ($)	Mar. 02, 2016	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Issuance of common units, maximum proceeds	$ 300,000,000
Distributions to holders of incentive distribution rights waived		$ 16,000,000	$ 17,000,000	$ 17,000,000	$ 50,000,000
General Partner \| General Partner Interest
Class of Stock [Line Items]
Aggregate percentage of general partner interest		2.00%
Common Units
Class of Stock [Line Items]
Units issued under the ATM Program (in shares)		1,000,000,000
Shell Pipeline Company L P \| General Partner \| General Partner Interest
Class of Stock [Line Items]
Aggregate percentage of general partner interest		2.00%
Shell Pipeline Company L P \| Limited Partner \| Limited Partner Interest
Class of Stock [Line Items]
Aggregate percentage of general partner interest		98.00%

(Deficit) Equity - Units Outsta

(Deficit) Equity - Units Outstanding (Details) - shares	3 Months Ended
(Deficit) Equity - Units Outstanding (Details) - shares	Mar. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common unitholders' capital account, units outstanding (in shares)	233,289,537	233,289,537
General Partner
Class of Stock [Line Items]
Capital units, publicly owned (in shares)	4,761,012
General Partner \| General Partner Interest
Class of Stock [Line Items]
Aggregate percentage of general partner interest	2.00%
General Public \| Common Units
Class of Stock [Line Items]
Common unitholders' capital account, units outstanding (in shares)	123,832,233	123,832,233
Capital units, publicly owned (in shares)	123,832,233
Shell Pipeline Company L P \| Common Units
Class of Stock [Line Items]
Common unitholders' capital account, units outstanding (in shares)	109,457,304	109,457,304
Capital units, publicly owned (in shares)	109,457,304
Shell Pipeline Company L P \| Limited Partner \| Limited Partner Interest
Class of Stock [Line Items]
Ownership interest percentage	46.00%
Aggregate percentage of general partner interest	98.00%
Shell Pipeline Company L P \| General Partner \| General Partner Interest
Class of Stock [Line Items]
Aggregate percentage of general partner interest	2.00%

(Deficit) Equity - Schedule of

(Deficit) Equity - Schedule of Distributions Declared and/or Paid (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid	$ 162	$ 162	$ 140	$ 131	$ 119	$ 129
Distributions paid per limited partner unit (in dollars per share)	$ 0.460	$ 0.4600	$ 0.4450	$ 0.4300	$ 0.4150	$ 0.4000
Shell Midstream Partners L.P.
Distribution Made To Limited Partner [Line Items]
Aggregate percentage of general partner interest							2.00%
Zydeco Pipeline Company LLC (“Zydeco”)
Distribution Made To Limited Partner [Line Items]
Distributions to noncontrolling interest	$ 1				$ 1
Odyssey Pipeline L.L.C. (“Odyssey”)
Distribution Made To Limited Partner [Line Items]
Distributions to noncontrolling interest	4				2
Common Units \| General Public
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid	57	$ 57	$ 56	$ 53	51	$ 49
Common Units \| Shell Pipeline Company L P
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid	50	50	48	47	42	40
General Partner
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid	3	3	3	3	3	3
General Partner \| IDR's
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid	$ 52	$ 52	$ 33	$ 28	$ 23	$ 37

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	$ 107	$ 117
Lease revenue	14	14
Total revenue	121	131
Transportation Services \| Third Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	29	40
Transportation Services \| Related Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	55	50
Storage Services \| Third Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	2	2
Storage Services \| Related Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	2	2
Terminaling Services \| Related Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	12	12
Product Revenue \| Third Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	0	1
Product Revenue \| Related Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	7	10
Transportation Services, Non-lease Service \| Related Parties
Disaggregation of Revenue [Line Items]
Total Topic 606 revenue	$ 1	$ 1

Revenue Recognition - Receivabl

Revenue Recognition - Receivables and Contract Liabilities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020USD ($)term	Dec. 31, 2019USD ($)	Jan. 01, 2019USD ($)
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	$ 10	$ 12
Deferred revenue	1	0	$ 0
Total	810
Less than 1 year	110
Years 2 to 3	219
Years 4 to 5	219
More than 5 years	262
Related Parties
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	27		24
Deferred revenue	1	0	0
Third Parties
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	10		$ 11
Deferred revenue	$ 1	$ 0
Transportation Services Operating Leases, Five Year Terms
Disaggregation of Revenue [Line Items]
Initial term	10 years
Number of additional terms \| term	2
Additional term	5 years
Transportation Services Operating Leases, One Year Terms
Disaggregation of Revenue [Line Items]
Initial term	10 years
Number of additional terms \| term	10
Additional term	1 year
Transportation Services Operating Leases
Disaggregation of Revenue [Line Items]
Initial term	10 years

Revenue Recognition - Contract

Revenue Recognition - Contract Balances (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020USD ($)
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	$ 0
Deferred revenue, ending balance	1
Third Parties
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	0
Additions	1
Reductions	0
Deferred revenue, ending balance	1
Related Parties
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	0
Additions	1
Reductions	0
Deferred revenue, ending balance	$ 1

Revenue Recognition - Remaining

Revenue Recognition - Remaining Performance Obligations (Details) $ in Millions	Mar. 31, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 978
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 124
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 121
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 121
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 121
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 491
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue expected to be recognized on multi-year committed shipper transportation contracts in place as of September 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 553
Revenue expected to be recognized on multi-year committed shipper transportation contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	81
Revenue expected to be recognized on multi-year committed shipper transportation contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	63
Revenue expected to be recognized on multi-year committed shipper transportation contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	63
Revenue expected to be recognized on multi-year committed shipper transportation contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	63
Revenue expected to be recognized on multi-year committed shipper transportation contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	283
Revenue expected to be recognized on other multi-year transportation service contracts in place as of September 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	39
Revenue expected to be recognized on other multi-year transportation service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	4
Revenue expected to be recognized on other multi-year transportation service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	6
Revenue expected to be recognized on other multi-year transportation service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	6
Revenue expected to be recognized on other multi-year transportation service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	6
Revenue expected to be recognized on other multi-year transportation service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	17
Revenue expected to be recognized on multi-year storage service contracts in place as of September 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	20
Revenue expected to be recognized on multi-year storage service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	3
Revenue expected to be recognized on multi-year storage service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	4
Revenue expected to be recognized on multi-year storage service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	4
Revenue expected to be recognized on multi-year storage service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	4
Revenue expected to be recognized on multi-year storage service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	5
Revenue expected to be recognized on multi-year terminaling service contracts in place as of September 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	366
Revenue expected to be recognized on multi-year terminaling service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	36
Revenue expected to be recognized on multi-year terminaling service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	48
Revenue expected to be recognized on multi-year terminaling service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	48
Revenue expected to be recognized on multi-year terminaling service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	48
Revenue expected to be recognized on multi-year terminaling service contracts in place as of September 30, 2019 \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 186

Net Income Per Limited Partne_3

Net Income Per Limited Partner Unit - Schedule of Allocation of Net Income to Arrive at Net Income Per Limited Partner Unit (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Limited Partners Capital Account [Line Items]
Net income	$ 142	$ 137
Less: Net income attributable to noncontrolling interests	4	5
Net income attributable to the Partnership	138	132
Distributions declared	162	119
Income (less than) / in excess of distributions	(24)	13
General Partner
Limited Partners Capital Account [Line Items]
Net income attributable to the Partnership	55	27
Distributions declared	55	26
Income (less than) / in excess of distributions	0	1
Limited Partners’ Common Units
Limited Partners Capital Account [Line Items]
Net income attributable to the Partnership	83	105
Distributions declared	107	93
Income (less than) / in excess of distributions	$ (24)	$ 12

Net Income Per Limited Partne_4

Net Income Per Limited Partner Unit - Schedule of Basic and Diluted Net Income Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Distribution Made To Limited Partner [Line Items]
Distributions declared	$ 162	$ 119
Income (less than) / in excess of distributions	(24)	13
Net income attributable to the Partnership	138	132
General Partner
Distribution Made To Limited Partner [Line Items]
Distributions declared	55	26
Income (less than) / in excess of distributions	0	1
Net income attributable to the Partnership	55	27
Limited Partners’ Common Units
Distribution Made To Limited Partner [Line Items]
Distributions declared	107	93
Income (less than) / in excess of distributions	(24)	12
Net income attributable to the Partnership	$ 83	$ 105
Weighted average units outstanding (in millions)
Weighted average units outstanding, basic and diluted (in shares)	233.3	223.8
Net income per Limited Partner Unit (in dollars)
Net income per Limited Partner unit, basic and diluted (in dollars per share)	$ 0.36	$ 0.47

Commitments and Contingencies (

Commitments and Contingencies (Details)	Jul. 01, 2019	Sep. 01, 2016
Commitments and Contingencies Disclosure [Abstract]
Tariff rate increase	4.30%
Initial term		10 years
Renewal term		1 year

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 22, 2020	Apr. 01, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Distributions paid per limited partner unit (in dollars per share)			$ 0.460	$ 0.4600	$ 0.4450	$ 0.4300	$ 0.4150	$ 0.4000
General Partner
Subsequent Event [Line Items]
Capital units, publicly owned (in shares)			4,761,012
Subsequent Event
Subsequent Event [Line Items]
Distributions paid per limited partner unit (in dollars per share)	$ 0.4600
Subsequent Event \| Purchase And Sale Agreement
Subsequent Event [Line Items]
Transportation, terminaling, and storage services revenue to be received		$ 151
Subsequent Event \| Partnership Interests Restructuring Agreement \| Common Units
Subsequent Event [Line Items]
Capital units, publicly owned (in shares)		393,289,537
Subsequent Event \| Partnership Interests Restructuring Agreement \| Common Units \| Shell Midstream LP Holdings LLC
Subsequent Event [Line Items]
Capital units, publicly owned (in shares)		269,457,304
Subsequent Event \| Partnership Interests Restructuring Agreement \| Series A Perpetual Convertible Preferred Units
Subsequent Event [Line Items]
Distribution to general partner (in units)		50,782,904
Distribution to general partner, quarterly distribution (in dollars per unit)		$ 0.2363
Subsequent Event \| Partnership Interests Restructuring Agreement \| General Partner
Subsequent Event [Line Items]
Distribution to general partner, waived		$ 20
Subsequent Event \| Partnership Interests Restructuring Agreement \| General Partner \| Common Units
Subsequent Event [Line Items]
Distribution to general partner (in units)		160,000,000
Subsequent Event \| Mattox Pipeline Company LLC \| Purchase And Sale Agreement
Subsequent Event [Line Items]
Percentage of voting interests acquired		79.00%
Subsequent Event \| Shell Midstream LP Holdings LLC \| Partnership Interests Restructuring Agreement \| Shell Midstream LP Holdings LLC
Subsequent Event [Line Items]
Aggregate percentage of general partner interest		68.50%

Uncategorized Items - shlx-2020

Label	Element	Value
Common Units Public [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (4,000,000)
Shell Pipeline Company LP [Member] \| General Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Shell Pipeline Company LP [Member] \| Common Units Public [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (5,000,000)