DCP Midstream (DCP-PC) 10-Q 7 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 01, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	DCP MIDSTREAM, LP
Entity Central Index Key	0001338065
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Amendment Flag	false
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Trading Symbol	DCP
Entity Common Stock, Shares Outstanding		143,317,328

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1	$ 1
Accounts receivable:
Trade, net of allowance for doubtful accounts of $3 and $3 million, respectively	732	860
Affiliates	176	166
Other	6	7
Inventories	52	79
Unrealized gains on derivative instruments	35	108
Collateral cash deposits	64	34
Other	16	16
Total current assets	1,082	1,271
Property, plant and equipment, net	9,110	9,135
Goodwill	194	231
Intangible assets, net	77	97
Investments in unconsolidated affiliates	3,460	3,340
Unrealized gains on derivative instruments	2	8
Operating Lease, Right-of-Use Asset	78	0
Other long-term assets	184	184
Total assets	14,187	14,266
Accounts payable:
Trade	786	807
Affiliates	116	96
Other	30	23
Current debt	1,125	525
Unrealized losses on derivative instruments	61	91
Accrued interest	72	71
Accrued taxes	65	64
Accrued wages and benefits	25	64
Capital spending accrual	28	63
Other	96	100
Total current liabilities	2,404	1,904
Long-term debt	4,236	4,782
Unrealized losses on derivative instruments	5	8
Deferred income taxes	32	32
Operating Lease, Liability, Noncurrent	66	0
Other long-term liabilities	231	243
Total liabilities	6,974	6,969
Commitments and contingent liabilities (see note 18)
Equity:
General partner	105	107
Limited partners (143,317,328 common units authorized, issued and outstanding, respectively)	6,327	6,418
Accumulated other comprehensive loss	(8)	(8)
Total partners’ equity	7,184	7,268
Noncontrolling interests	29	29
Total equity	7,213	7,297
Total liabilities and equity	14,187	14,266
Series A Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	498	489
Total equity	498	489
Series B Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	156	156
Total equity	156	156
Series C Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	106	106
Total equity	$ 106	$ 106

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Condensed Balance Sheet Statements, Captions [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$ 3	$ 3
Common unitholders, units issued (in shares)	143,317,328	143,317,328
Common unitholders, units outstanding (in shares)	143,317,328	143,317,328
Series A Preferred Limited Partners [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Preferred Units, Issued	500,000	500,000
Preferred Units, Outstanding	500,000	500,000
Series B Preferred Limited Partners [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Preferred Units, Issued	6,450,000	6,450,000
Preferred Units, Outstanding	6,450,000	6,450,000
Series C Preferred Limited Partners [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Preferred Units, Issued	4,400,000	4,400,000
Preferred Units, Outstanding	4,400,000	4,400,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating revenues:
Sales of natural gas, NGLs and condensate	$ 115	$ 111
Trading and marketing losses, net	(27)	(41)
Total operating revenues	2,199	2,139
Operating costs and expenses:
Purchases and related costs	1,804	1,769
Operating and maintenance expense	178	162
Depreciation and amortization expense	103	94
General and administrative expense	67	59
Other expense, net	5	2
Loss on sale of assets, net	9	0
Total operating costs and expenses	2,166	2,086
Operating income	33	53
Earnings from unconsolidated affiliates	113	78
Interest expense, net	(69)	(67)
Income before income taxes	77	64
Income tax expense	(1)	(1)
Net income	76	63
Net income attributable to noncontrolling interests	(1)	(1)
Net income attributable to partners	75	62
Series A preferred limited partners' interest in net income	(9)	(9)
Series B preferred limited partners' interest in net income	(3)	0
Series C preferred limited partners' interest in net income	(2)	0
General partner’s interest in net income	(41)	(41)
Net income allocable to limited partners	$ 20	$ 12
Net income per limited partner unit — basic and diluted	$ 0.14	$ 0.08
Weighted Average Limited Partnership Units Outstanding, Basic	143.3	143.3
Weighted Average Limited Partnership Units Outstanding, Diluted	143.3	143.3
Natural Gas, NGLs and Condensate [Member]
Operating revenues:
Sales of natural gas, NGLs and condensate	$ 2,111	$ 2,069
Natural Gas, NGLs and Condensate [Member] | Third Party
Operating revenues:
Sales of natural gas, NGLs and condensate	1,771	1,744
Operating costs and expenses:
Purchases and related costs	1,533	1,604
Transportation, Processing and Other [Member]
Operating revenues:
Sales of natural gas, NGLs and condensate	115	111
Affiliated Entity | Natural Gas, NGLs and Condensate [Member]
Operating revenues:
Sales of natural gas, NGLs and condensate	340	325
Operating costs and expenses:
Purchases and related costs	$ 271	$ 165

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 76	$ 63
Other comprehensive income:
Total other comprehensive income	0	0
Total comprehensive income	76	63
Total comprehensive income attributable to noncontrolling interests	(1)	(1)
Total comprehensive income attributable to partners	$ 75	$ 62

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES:
Net income	$ 76	$ 63
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	103	94
Earnings from unconsolidated affiliates	(113)	(78)
Distributions from unconsolidated affiliates	124	91
Net unrealized losses on derivative instruments	54	29
Loss on sale of assets, net	9	0
Other, net	6	6
Change in operating assets and liabilities, which provided (used) cash:
Accounts receivable	118	161
Inventories	14	17
Accounts payable	29	(151)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(103)	(110)
Net cash provided by operating activities	317	122
INVESTING ACTIVITIES:
Capital expenditures	(182)	(124)
Investments in unconsolidated affiliates	(131)	(60)
Proceeds from sale of assets	103	3
Net cash used in investing activities	(210)	(181)
FINANCING ACTIVITIES:
Proceeds from debt	1,402	635
Payments of debt	(1,348)	(535)
Distributions to preferred limited partners	(5)	0
Distributions to limited partners and general partner	(154)	(194)
Distributions to noncontrolling interests	(1)	(1)
Other	(1)	0
Net cash used in financing activities	(107)	(95)
Net change in cash and cash equivalents	0	(154)
Cash and cash equivalents, beginning of period	1	156
Cash and cash equivalents, end of period	$ 1	$ 2

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Series A Preferred Limited Partners [Member]	Series B Preferred Limited Partners [Member]	Series C Preferred Limited Partners [Member]	General Partner	Limited Partners	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests
Beginning balance at Dec. 31, 2017	$ 7,438	$ 491			$ 154	$ 6,772	$ (9)	$ 30
Increase (Decrease) in Partners' Capital [Roll Forward]
Cumulative effect adjustment for Adoption of ASC 606	6	0			0	6	0	0
Net income	63	9			41	12	0	1
Other comprehensive income	0
Distributions to noncontrolling interests	(1)	0			0	0	0	1
Total Cash Distribution	(194)	0			(83)	(111)	0	0
Ending balance at Mar. 31, 2018	7,312	500			112	6,679	(9)	30
Beginning balance at Dec. 31, 2018	7,297	489	$ 156	$ 106	107	6,418	(8)	29
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	76	9	3	2	41	20		1
Other comprehensive income	0
Distributions to noncontrolling interests	(1)	0	0	0	0	0	0	(1)
Total Cash Distribution	(159)	0	(3)	(2)	(43)	(111)
Ending balance at Mar. 31, 2019	$ 7,213	$ 498	$ 156	$ 106	$ 105	$ 6,327	$ (8)	$ 29

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	1. Description of Business and Basis of Presentation DCP Midstream, LP, with its consolidated subsidiaries, or "us", "we", "our" or the "Partnership" is a Delaware limited partnership formed in 2005 by DCP Midstream, LLC to own, operate, acquire and develop a diversified portfolio of complementary midstream energy assets. Our Partnership includes our Logistics and Marketing and Gathering and Processing segments. For additional information regarding these segments, see Note 19 - Business Segments. Our operations and activities are managed by our general partner, DCP Midstream GP, LP, which in turn is managed by its general partner, DCP Midstream GP, LLC, which we refer to as the General Partner, and which is 100% owned by DCP Midstream, LLC. DCP Midstream, LLC and its subsidiaries and affiliates, collectively referred to as DCP Midstream, LLC, is owned 50% by Phillips 66 and 50% by Enbridge Inc. and its affiliates, or Enbridge. DCP Midstream, LLC directs our business operations through its ownership and control of the General Partner. As of March 31, 2019 , DCP Midstream, LLC owned approximately 38.1% of us, including limited partner and general partner interests. The condensed consolidated financial statements include the accounts of the Partnership and all majority-owned subsidiaries where we have the ability to exercise control. Investments in greater than 20% owned affiliates that are not variable interest entities and where we do not have the ability to exercise control, and investments in less than 20% owned affiliates where we have the ability to exercise significant influence, are accounted for using the equity method. The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP. All intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements in this Quarterly Report on Form 10-Q have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the SEC). Accordingly, these condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments, that are, in the opinion of management, necessary to present fairly the financial position and results of operations for the respective interim periods. Certain information and note disclosures normally included in our annual financial statements prepared in accordance with GAAP have been condensed or omitted from these interim financial statements pursuant to such rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading. Results of operations for the three months ended March 31, 2019

Updates to Significant Accounti

Updates to Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Updates to Significant Accounting Policies [Abstract]
Update to Significant Accounting Policies	2. Update to Significant Accounting Policies Our significant accounting policies are detailed in Note 2 - Summary of Significant Accounting Policies of our Annual Report on Form 10-K for the year ended December 31, 2018. Significant changes to our accounting policies as a result of Topic 842 (as defined below) are discussed below: Leases

New Accounting Pronouncements

New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements, Policy [Abstract]
New Accounting Pronouncements	3. New Accounting Pronouncements Financial Accounting Standards Board, or FASB, Accounting Standards Update, or ASU, 2016-13 "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" or ASU 2016-13 - In June 2016, the FASB issued ASU 2016-13, which amends current measurement techniques used to estimate credit losses for financial assets. This ASU is effective for interim and annual reporting periods beginning after December 15, 2019, with the option to early adopt for financial statements that have not been issued. We are currently evaluating the potential impact this standard will have on our consolidated financial statements and related disclosures. FASB ASU, 2016-02 “Leases (Topic 842),” or ASU 2016-02 - In February 2016, the FASB issued ASU 2016-02, which requires lessees to recognize a lease liability on a discounted basis and the right of use of a specified asset at the commencement date for all leases. We adopted this ASU on January 1, 2019 using the modified retrospective approach without application to prior periods. We implemented the following practical expedients and policy elections permitted under the new standard: (a) the package of practical expedients allowing us to not reassess whether expired or existing contracts contain a lease, the lease classification for any expired or existing leases and the treatment of initial direct costs for any expired or existing leases, (b) the land easement practical expedient, allowing us to carry forward our current accounting treatment for land easements on existing agreements, (c) not recognizing lease assets or liabilities when lease terms are less than twelve months and (d) for agreements that contain both lease and non-lease components, combining these components together and accounting for them as a single lease. The effect of the changes made to our consolidated January 1, 2019 balance sheet as a result of the adoption of Topic 842 was as follows: Balance at Adjustments due to Topic 842 Balance at December 31, 2018 January 1, 2019 (millions) Balance Sheet Operating lease assets $ — $ 84 $ 84 Current liabilities: Other $ 100 $ 25 $ 125 Operating lease liabilities $ — $ 66 $ 66 Other long-term liabilities $ 243 $ (7 ) $ 236 This change did not have any impact on our consolidated statement of operations or consolidated statement of cash flows.

Dispositions

Dispositions	3 Months Ended
	Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	4 . Dispositions On January 30, 2019, we entered into a purchase and sale agreement with NGL Energy Partners LP to sell Gas Supply Resources, our wholesale propane business primarily consisting of seven natural gas liquids terminals in the Eastern United States within our Logistics and Marketing segment for a purchase price of $90 million . Net proceeds received were approximately $103 million due to customary purchase price adjustments. The transaction closed effective March 1, 2019. We recognized a loss on sale of $ 9 million , net of goodwill, in the first quarter of 2019.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2019
Revenue Recognition [Abstract]
Revenue from External Customers by Products and Services [Table Text Block]	5 . Revenue Recognition We disaggregate our revenue from contracts with customers by type of contract for each of our reportable segments, as we believe it best depicts the nature, timing and uncertainty of our revenue and cash flows. The following tables set forth our revenue by those categories: Three Months Ended March 31, 2019 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 637 $ 557 $ (498 ) $ 696 Sales of NGLs and condensate (a) 1,403 648 (636 ) 1,415 Transportation, processing and other 12 103 — 115 Trading and marketing losses, net (b) $ (7 ) $ (20 ) — (27 ) Total operating revenues $ 2,045 $ 1,288 $ (1,134 ) $ 2,199 Three Months Ended March 31, 2018 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 553 $ 446 $ (419 ) $ 580 Sales of NGLs and condensate (a) 1,456 740 (707 ) 1,489 Transportation, processing and other 14 97 — 111 Trading and marketing (losses) gains, net (b) $ (44 ) $ 3 — (41 ) Total operating revenues $ 1,979 $ 1,286 $ (1,126 ) $ 2,139 (a) Includes $ 858 million and $ 793 million for the three months ended March 31, 2019 and 2018 , respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our logistics and marketing segment, which are not within the scope of FASB ASU 2014-09 "Revenue from Contracts with Customers" (Topic 606). (b) Not within the scope of Topic 606. The revenue expected to be recognized in the future related to performance obligations that are not satisfied is approximately $212 million as of March 31, 2019 . Our remaining performance obligations primarily consist of minimum volume commitment fee arrangements and are expected to be recognized through 2028 with a weighted average remaining life of 5 years as of March 31, 2019

Contract Liabilities

Contract Liabilities	3 Months Ended
	Mar. 31, 2019
Contract Assets and Liabilities [Abstract]
Contract Assets and Liabilities [Text Block]	6. Contract Liabilities Our contract liabilities consist of deferred revenue received from reimbursable projects. The noncurrent portion of deferred revenue is included in other long-term liabilities on our condensed consolidated balance sheet. The following table summarizes changes in contract liabilities included in our condensed consolidated balance sheet: March 31, 2019 (millions) Balance, beginning of period $ 34 Revenue recognized (a) — Balance, end of period $ 34 (a) Deferred revenue recognized is included in transportation, processing and other on the condensed consolidated statement of operations. The contract liabilities disclosed in the table above will be recognized as revenue as the obligations are satisfied over their average remaining contract life, which is 35 years as of March 31, 2019

Agreements and Transactions wit

Agreements and Transactions with Affiliates	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Agreements and Transactions with Affiliates	7 . Agreements and Transactions with Affiliates DCP Midstream, LLC Services Agreement and Other General and Administrative Charges Under the Services and Employee Secondment Agreement (the “Services Agreement”), we are required to reimburse DCP Midstream, LLC for costs, expenses, and expenditures incurred or payments made on our behalf for general and administrative functions including, but not limited to, legal, accounting, compliance, treasury, insurance administration and claims processing, risk management, health, safety and environmental, information technology, human resources, benefit plan maintenance and administration, credit, payroll, internal audit, taxes and engineering, as well as salaries and benefits of seconded employees, insurance coverage and claims, capital expenditures, maintenance and repair costs and taxes. There is no limit on the reimbursements we make to DCP Midstream, LLC under the Services Agreement for costs, expenses and expenditures incurred or payments made on our behalf. The following table summarizes employee related costs that were charged by DCP Midstream, LLC to the Partnership that are included in the condensed consolidated statements of operations: Three Months Ended March 31, 2019 2018 (millions) Employee related costs charged by DCP Midstream, LLC Operating and maintenance expense $ 49 $ 50 General and administrative expense $ 47 $ 38 Phillips 66 and its Affiliates We sell a portion of our residue gas and NGLs to and purchase NGLs from Phillips 66 and its respective affiliates . We anticipate continuing to sell commodities to and purchase commodities from Phillips 66 and its affiliates in the ordinary course of business. Enbridge and its Affiliates We sell NGLs to and purchase NGLs from Enbridge and its affiliates. We anticipate continuing to sell commodities to and purchase commodities from Enbridge and its affiliates in the ordinary course of business. Unconsolidated Affiliates We sell a portion of our residue gas and NGLs to, purchase natural gas and other NGL products from, and provide gathering and transportation services to other unconsolidated affiliates. We anticipate continuing to purchase and sell commodities and provide services to unconsolidated affiliates in the ordinary course of business. Summary of Transactions with Affiliates The following table summarizes our transactions with affiliates: Three Months Ended March 31, 2019 2018 (millions) Phillips 66 (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ 326 $ 302 Purchases and related costs from affiliates $ 45 $ 10 Operating and maintenance and general administrative expenses $ 4 $ 3 Enbridge (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ — $ 12 Purchases and related costs from affiliates $ 7 $ 10 Unconsolidated affiliates: Sales of natural gas, NGLs and condensate to affiliates $ 14 $ 11 Transportation, processing, and other to affiliates $ 1 $ 1 Purchases and related costs from affiliates $ 219 $ 145 We had balances with affiliates as follows: March 31, 2019 December 31, 2018 (millions) Phillips 66 (including its affiliates): Accounts receivable $ 146 $ 145 Accounts payable $ 28 $ 22 Enbridge (including its affiliates): Accounts payable $ 2 $ 2 Unconsolidated affiliates: Accounts receivable $ 30 $ 21 Accounts payable $ 86 $ 72

Inventories

Inventories	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories	8 . Inventories Inventories were as follows: March 31, 2019 December 31, 2018 (millions) Natural gas $ 23 $ 34 NGLs 29 45 Total inventories $ 52 $ 79 We recognize lower of cost or market adjustments when the carrying value of our inventories exceeds their estimated market value. These non-cash charges are a component of purchases and related costs in the condensed consolidated statements of operations. During the three months ended March 31, 2019 , we recognized lower of cost or net realizable value adjustments of $5 million . We recognized no lower of cost or net realizable value adjustments during the three months ended March 31, 2018

Property, Plant and Equipment

Property, Plant and Equipment	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment A summary of property, plant and equipment by classification is as follows: Depreciable March 31, 2019 December 31, 2018 (millions) Gathering and transmission systems 20 — 50 Years $ 8,539 $ 8,492 Processing, storage and terminal facilities 35 — 60 Years 5,149 5,194 Other 3 — 30 Years 571 568 Construction work in progress 527 470 Property, plant and equipment 14,786 14,724 Accumulated depreciation (5,676 ) (5,589 ) Property, plant and equipment, net $ 9,110 $ 9,135 Interest capitalized on construction projects was $5 million for the three months ended March 31, 2019 and 2018 , respectively. Depreciation expense was $101 million and $92 million for the three months ended March 31, 2019 and 2018 , respectively.

Goodwlll

Goodwlll	3 Months Ended
	Mar. 31, 2019
Goodwill Disclosure [Abstract]
Goodwill Disclosure [Text Block]	10 . Goodwill The carrying amount of goodwill in each of our reportable segments was as follows: March 31, 2019 (millions) Gathering and Processing Logistics and Marketing Total Balance, beginning of period $ 159 $ 72 $ 231 Dispositions — (37 ) (37 ) Balance, end of period $ 159 $ 35 $ 194

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Affiliates	Investments in Unconsolidated Affiliates The following table summarizes our investments in unconsolidated affiliates: Carrying Value as of Percentage March 31, December 31, 2018 (millions) DCP Sand Hills Pipeline, LLC 66.67% $ 1,787 $ 1,791 DCP Southern Hills Pipeline, LLC 66.67% 731 728 Discovery Producer Services LLC 40.00% 339 344 Front Range Pipeline LLC 33.33% 185 175 Texas Express Pipeline LLC 10.00% 98 95 Gulf Coast Express Pipeline LLC 25.00% 257 146 Mont Belvieu Enterprise Fractionator 12.50% 27 24 Panola Pipeline Company, LLC 15.00% 22 23 Mont Belvieu 1 Fractionator 20.00% 10 10 Other Various 4 4 Total investments in unconsolidated affiliates $ 3,460 $ 3,340 Earnings from investments in unconsolidated affiliates were as follows: Three Months Ended March 31, 2019 2018 (millions) DCP Sand Hills Pipeline, LLC $ 68 $ 48 DCP Southern Hills Pipeline, LLC 23 13 Discovery Producer Services LLC — 1 Front Range Pipeline LLC 7 5 Texas Express Pipeline LLC 5 2 Mont Belvieu Enterprise Fractionator 4 4 Mont Belvieu 1 Fractionator 4 4 Other 2 1 Total earnings from unconsolidated affiliates $ 113 $ 78 The following tables summarize the combined financial information of our investments in unconsolidated affiliates: Three Months Ended March 31, 2019 2018 (millions) Statements of operations: Operating revenue $ 421 $ 334 Operating expenses $ 191 $ 139 Net income $ 231 $ 194 March 31, December 31, (millions) Balance sheets: Current assets $ 327 $ 411 Long-term assets 6,941 6,359 Current liabilities (450 ) (424 ) Long-term liabilities (249 ) (221 ) Net assets $ 6,569 $ 6,125

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement Valuation Hierarchy Our fair value measurements are grouped into a three-level valuation hierarchy and are categorized in their entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows. • Level 1 — inputs are unadjusted quoted prices for identical assets or liabilities in active markets. • Level 2 — inputs include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 — inputs are unobservable and considered significant to the fair value measurement. A financial instrument’s categorization within the hierarchy is based upon the level of judgment involved in the most significant input in the determination of the instrument’s fair value. Following is a description of the valuation methodologies used as well as the general classification of such instruments pursuant to the hierarchy. Commodity Derivative Assets and Liabilities We enter into a variety of derivative financial instruments, which may include exchange traded instruments (such as New York Mercantile Exchange, or NYMEX, crude oil or natural gas futures) or over-the-counter, or OTC, instruments (such as natural gas contracts, crude oil or NGL swaps). The exchange traded instruments are generally executed with a highly rated broker dealer serving as the clearinghouse for individual transactions. Our activities expose us to varying degrees of commodity price risk. To mitigate a portion of this risk and to manage commodity price risk related primarily to owned natural gas storage and pipeline assets, we engage in natural gas asset based trading and marketing, and we may enter into natural gas and crude oil derivatives to lock in a specific margin when market conditions are favorable. A portion of this may be accomplished through the use of exchange traded derivative contracts. Such instruments are generally classified as Level 1 since the value is equal to the quoted market price of the exchange traded instrument as of our balance sheet date, and no adjustments are required. Depending upon market conditions and our strategy we may enter into exchange traded derivative positions with a significant time horizon to maturity. Although such instruments are exchange traded, market prices may only be readily observable for a portion of the duration of the instrument. In order to calculate the fair value of these instruments, readily observable market information is utilized to the extent it is available; however, in the event that readily observable market data is not available, we may interpolate or extrapolate based upon observable data. In instances where we utilize an interpolated or extrapolated value, and it is considered significant to the valuation of the contract as a whole, we would classify the instrument within Level 3. We also engage in the business of trading energy related products and services, which exposes us to market variables and commodity price risk. We may enter into physical contracts or financial instruments with the objective of realizing a positive margin from the purchase and sale of these commodity-based instruments. We may enter into derivative instruments for NGLs or other energy related products, primarily using the OTC derivative instrument markets, which are not as active and liquid as exchange traded instruments. Market quotes for such contracts may only be available for short dated positions (up to six months), and an active market itself may not exist beyond such time horizon. Contracts entered into with a relatively short time horizon for which prices are readily observable in the OTC market are generally classified within Level 2. Contracts with a longer time horizon, for which we internally generate a forward curve to value such instruments, are generally classified within Level 3. The internally generated curve may utilize a variety of assumptions including, but not limited to, data obtained from third-party pricing services, historical and future expected relationship of NGL prices to crude oil prices, the knowledge of expected supply sources coming online, expected weather trends within certain regions of the United States, and the future expected demand for NGLs. Each instrument is assigned to a level within the hierarchy at the end of each financial quarter depending upon the extent to which the valuation inputs are observable. Generally, an instrument will move toward a level within the hierarchy that requires a lower degree of judgment as the time to maturity approaches, and as the markets in which the asset trades will likely become more liquid and prices more readily available in the market, thus reducing the need to rely upon our internally developed assumptions. However, the level of a given instrument may change, in either direction, depending upon market conditions and the availability of market observable data. Nonfinancial Assets and Liabilities We utilize fair value to perform impairment tests as required on our property, plant and equipment, goodwill, equity investments in unconsolidated affiliates, and intangible assets. Assets and liabilities acquired in third party business combinations are recorded at their fair value as of the date of acquisition. The inputs used to determine such fair value are primarily based upon internally developed cash flow models and would generally be classified within Level 3 in the event that we were required to measure and record such assets at fair value within our condensed consolidated financial statements. Additionally, we use fair value to determine the inception value of our asset retirement obligations. The inputs used to determine such fair value are primarily based upon costs incurred historically for similar work, as well as estimates from independent third parties for costs that would be incurred to restore leased property to the contractually stipulated condition, and would generally be classified within Level 3. The following table presents the financial instruments carried at fair value as of March 31, 2019 and December 31, 2018 , by condensed consolidated balance sheet caption and by valuation hierarchy, as described above: March 31, 2019 December 31, 2018 Level 1 Level 2 Level 3 Total Carrying Value Level 1 Level 2 Level 3 Total Carrying Value (millions) Current assets: Commodity derivatives (a) $ 16 $ 14 $ 5 $ 35 $ 62 $ 32 $ 14 $ 108 Long-term assets: Commodity derivatives (b) $ — $ 1 $ 1 $ 2 $ 4 $ 2 $ 2 $ 8 Current liabilities: Commodity derivatives (c) $ (14 ) $ (46 ) $ (1 ) $ (61 ) $ (39 ) $ (52 ) $ — $ (91 ) Long-term liabilities: Commodity derivatives (d) $ — $ (4 ) $ (1 ) $ (5 ) $ (1 ) $ (5 ) $ (2 ) $ (8 ) (a) Included in current unrealized gains on derivative instruments in our condensed consolidated balance sheets. (b) Included in long-term unrealized gains on derivative instruments in our condensed consolidated balance sheets. (c) Included in current unrealized losses on derivative instruments in our condensed consolidated balance sheets. (d) Included in long-term unrealized losses on derivative instruments in our condensed consolidated balance sheets. Changes in Levels 1 and 2 Fair Value Measurements The determination to classify a financial instrument within Level 1 or Level 2 is based upon the availability of quoted prices for identical or similar assets and liabilities in active markets. Depending upon the information readily observable in the market, and/or the use of identical or similar quoted prices, which are significant to the overall valuation, the classification of any individual financial instrument may differ from one measurement date to the next. To qualify as a transfer, the asset or liability must have existed in the previous reporting period and moved into a different level during the current period. In the event that there is a movement between the classification of an instrument as Level 1 or 2, the transfer would be reflected in a table as “Transfers into or out of Level 1 and Level 2”. During the three months ended March 31, 2019 and 2018 , there were no transfers between Level 1 and Level 2 of the fair value hierarchy. Changes in Level 3 Fair Value Measurements The tables below illustrate a rollforward of the amounts included in our condensed consolidated balance sheets for derivative financial instruments that we have classified within Level 3. Since financial instruments classified as Level 3 typically include a combination of observable components (that is, components that are actively quoted and can be validated to external sources) and unobservable components, the gains and losses in the table below may include changes in fair value due in part to observable market factors, or changes to our assumptions on the unobservable components. Depending upon the information readily observable in the market, and/or the use of unobservable inputs, which are significant to the overall valuation, the classification of any individual financial instrument may differ from one measurement date to the next. The significant unobservable inputs used in determining fair value include adjustments by other market-based or independently sourced market data such as historical commodity volatilities, crude oil future yield curves, and/or counterparty specific considerations. In the event that there is a movement to/from the classification of an instrument as Level 3, we would reflect such items in the table below within the “Transfers into/out of Level 3” captions. We manage our overall risk at the portfolio level and in the execution of our strategy, we may use a combination of financial instruments, which may be classified within any level. Since Level 1 and Level 2 risk management instruments are not included in the rollforward below, the gains or losses in the table do not reflect the effect of our total risk management activities. Commodity Derivative Instruments Current Long-Term Current Long-Term (millions) Three months ended March 31, 2019 (a): Beginning balance $ 14 $ 2 $ — $ (2 ) Net unrealized (losses) gains included in earnings (b) (4 ) (1 ) (2 ) 1 Transfers out of Level 3 (c) (2 ) — — — Settlements (3 ) — 1 — Ending balance $ 5 $ 1 $ (1 ) $ (1 ) Net unrealized losses on derivatives still held included in earnings (b) $ — $ — $ (1 ) $ (1 ) Three months ended March 31, 2018 (a): Beginning balance $ 3 $ 1 $ (13 ) $ (1 ) Net unrealized (losses) gains included in earnings (b) — (1 ) 4 (2 ) Transfers out of Level 3 (c) — — 2 — Settlements (1 ) — 1 — Ending balance $ 2 $ — $ (6 ) $ (3 ) Net unrealized (losses) gains on derivatives still held included in earnings (b) $ — $ (1 ) $ 2 $ (2 ) (a) There were no purchases, issuances or sales of derivatives or transfers into Level 3 for the three months ended March 31, 2019 and 2018 . (b) Represents the amount of unrealized gains or losses for the period, included in trading and marketing gains (losses), net. (c) Amounts transferred out of Level 3 are reflected at fair value at the end of the period. Quantitative Information and Fair Value Sensitivities Related to Level 3 Unobservable Inputs We utilize the market approach to measure the fair value of our commodity contracts. The significant unobservable inputs used in this approach to fair value are longer dated price quotes. Our sensitivity to these longer dated forward curve prices are presented in the table below. Significant changes in any of those inputs in isolation would result in significantly different fair value measurements, depending on our short or long position in contracts. March 31, 2019 Product Group Fair Value Forward Curve Range (millions) Assets NGLs $ 5 $0.24-$1.24 Per gallon Natural gas $ 1 $1.95-$2.58 Per MMBtu Liabilities NGLs $ (1 ) $0.13-$1.24 Per gallon Natural gas $ (1 ) $2.42-$2.86 Per MMBtu Estimated Fair Value of Financial Instruments Valuation of a contract’s fair value is validated by an internal group independent of the marketing group. While common industry practices are used to develop valuation techniques, changes in pricing methodologies or the underlying assumptions could result in significantly different fair values and income recognition. When available, quoted market prices or prices obtained through external sources are used to determine a contract’s fair value. For contracts with a delivery location or duration for which quoted market prices are not available, fair value is determined based on pricing models developed primarily from historical and expected relationships with quoted market prices. The fair value of accounts receivable and accounts payable are not materially different from their carrying amounts because of the short-term nature of these instruments or the stated rates approximating market rates. Derivative instruments are carried at fair value. We determine the fair value of our fixed-rate senior notes and junior subordinated notes based on quotes obtained from bond dealers. The fair value of borrowings under the Credit Agreement (defined below) and the accounts receivable securitization facility (the Securitization Facility) are based on carrying value, which approximates fair value as their interest rates are based on prevailing market interest rates. We classify the fair values of our outstanding debt balances within Level 2 of the valuation hierarchy. As of March 31, 2019 and December 31, 2018 , the carrying value and fair value of our total debt, including current maturities, were as follows: March 31, 2019 December 31, 2018 Carrying Value (a) Fair Value Carrying Value (a) Fair Value (millions) Total debt $ 5,391 $ 5,476 $ 5,337 $ 5,170 (a) Excludes unamortized issuance costs.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	13 . Leases We have operating leases for transportation agreements, office space, vehicles, compressors and field equipment. Our leases have remaining lease terms of less than 1 year to 22 years, some of which may include options to extend leases up to 20 years, and some of which may include options to terminate the leases in less than one year. Extension options on certain compressors and field equipment are included in the lease terms used to calculate our operating lease assets and liabilities as it is reasonably certain that we will exercise those options. We do not have any finance leases as of March 31, 2019 . Operating leases are included in operating lease assets, other current liabilities and operating lease liabilities on our condensed consolidated balance sheet as of March 31, 2019 as follows: As of March 31, 2019 (millions) Operating lease assets $ 78 Operating lease liabilities $ 66 Other current liabilities 18 Total $ 84 The components of lease expense, including variable lease costs primarily consisting of common area maintenance on our office spaces and variable transportation costs, are as follows: Three months ended March 31, 2019 (millions) Operating lease cost $ 6 Variable lease cost 2 Short term lease cost 1 Total lease cost $ 9 Maturities of operating lease liabilities under non-cancelable leases as of March 31, 2019 are as follows: Three months ended March 31, 2019 (millions) 2019 - remainder $ 16 2020 22 2021 20 2022 15 2023 9 Thereafter 11 Total lease payments $ 93 Less imputed interest (9 ) Total operating lease liabilities $ 84 Minimum rental payments under our various operating leases in the year indicated were as follows as of December 31, 2018 : Future Minimum Rental Payments as of December 31, 2018 (millions) 2019 $ 22 2020 18 2021 14 2022 9 2023 5 Thereafter 7 Total minimum rental payments $ 75 Consolidated rental expense totaled $8 million for the three months ended March 31, 2018 . Supplemental cash flow information related to leases as follows: Three months ended March 31, 2019 (millions) Cash paid for amounts included in the measurement of operating lease liabilities: $ 6 Right-of-use assets obtained in exchange for operating lease obligations following the adoption of Topic 842: $ 6 Other information related to operating leases as follows: Weighted average remaining lease term 6 years Weighted average discount rate 4.00 %

Debt

Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	Debt March 31, 2019 December 31, 2018 (millions) Senior notes: Issued March 2014, interest at 2.700% payable semi-annually, due April 2019 325 325 Issued March 2010, interest at 5.350% payable semiannually, due March 2020 (a) 600 600 Issued September 2011, interest at 4.750% payable semiannually, due September 2021 500 500 Issued March 2012, interest at 4.950% payable semi-annually, due April 2022 350 350 Issued March 2013, interest at 3.875% payable semi-annually, due March 2023 500 500 Issued July 2018 and January 2019, interest at 5.375% payable semi-annually, due July 2025 825 500 Issued August 2000, interest at 8.125% payable semi-annually, due August 2030 (a) 300 300 Issued October 2006, interest at 6.450% payable semi-annually, due November 2036 300 300 Issued September 2007, interest at 6.750% payable semi-annually, due September 2037 450 450 Issued March 2014, interest at 5.600% payable semi-annually, due April 2044 400 400 Junior subordinated notes: Issued May 2013, interest at 5.850% payable semi-annually, due May 2043 550 550 Credit agreement: Revolving credit facility, weighted-average variable interest rate of 3.950%, as of March 31, 2019, due December 2022 80 351 Accounts receivable securitization facility: Accounts receivable securitization facility, weighted-average variable interest rate of 3.290% as of March 31, 2019, due August 2019 200 200 Fair value adjustments related to interest rate swap fair value hedges (a) 20 21 Unamortized issuance costs (30 ) (30 ) Unamortized discount (9 ) (10 ) Total debt 5,361 5,307 Current debt 1,125 525 Total long-term debt $ 4,236 $ 4,782 (a) The swaps associated with this debt were previously terminated. The remaining long-term fair value of approximately $20 million related to the swaps is being amortized as a reduction to interest expense through 2020 and 2030, the original maturity dates of the debt. Accounts Receivable Securitization Facility In August 2018, we entered into our Securitization Facility that provides up to $200 million of borrowing capacity through August 2019 at LIBOR market index rates plus a margin. Under this Securitization Facility, certain of the Partnership’s wholly owned subsidiaries sell or contribute receivables to another of the Partnership’s consolidated subsidiaries, DCP Receivables LLC (“DCP Receivables”), a bankruptcy-remote special purpose entity created for the sole purpose of the Securitization Facility. DCP Receivables’ sole activity consists of purchasing receivables from the Partnership’s wholly owned subsidiaries that participate in the Securitization Facility and providing these receivables as collateral for DCP Receivables’ borrowings under the Securitization Facility. DCP Receivables is a separate legal entity and the accounts receivable of DCP Receivables, up to the amount of the outstanding debt under the Securitization Facility, are not available to satisfy the claims of creditors of the Partnership, its subsidiaries selling receivables under the Securitization Facility, or their affiliates. Any excess receivables are eligible to satisfy the claims of creditors of the Partnership, its subsidiaries selling receivables under the Securitization Facility, or their affiliates. The amount available for borrowing is based on the availability of eligible receivables and other customary factors and conditions. As of March 31, 2019, DCP Receivables had $766 million of our accounts receivable securing borrowings of $200 million under its Securitization Facility. Borrowings under the Securitization Facility are included in “Current debt” on the condensed consolidated balance sheet. Senior Notes Issuance On January 18, 2019 , we issued an additional $325 million of aggregate principal amount of our existing $500 million 5.375% Senior Notes due July 2025 . We received proceeds of $324 million , net of underwriters’ fees, related expenses and issuance premiums, which we used for general partnership purposes including the funding of capital expenditures and repayment of outstanding indebtedness under the Credit Agreement. The full $ 825 million of our 5.375% Senior Notes due July 2025 is treated as a single series of debt. The 2025 notes will mature on July 15, 2025 unless redeemed prior to maturity. Interest on the 2025 notes is payable semi-annually in arrears on January 15 and July 15 of each year. Credit Agreement We are a party to a $ 1.4 billion unsecured revolving Credit Agreement (the "Credit Agreement") which matures on December 6, 2022 . The Credit Agreement also grants us the option to increase the revolving loan commitment by an aggregate principal amount of up to $500 million , subject to requisite lender approval. The Credit Agreement may be extended for up to two additional one-year periods subject to requisite lender approval. Loans under the Credit Agreement may be used for working capital and other general partnership purposes including acquisitions. The Credit Agreement allows for unrestricted cash and cash equivalents to be netted against consolidated indebtedness for purposes of calculating the Partnership’s Consolidated Leverage Ratio (as defined in the Credit Agreement). Additionally, under the Credit Agreement, the Consolidated Leverage Ratio of the Partnership as of the end of any fiscal quarter shall not exceed 5.00 to 1.0 provided that, if there is a Qualified Acquisition (as defined in the Credit Agreement), the maximum Consolidated Leverage Ratio shall not exceed 5.50 to 1.0 at the end of the three consecutive fiscal quarters, including the fiscal quarter in which the Qualified Acquisition occurs. Our cost of borrowing under the Credit Agreement is determined by a ratings-based pricing grid. Indebtedness under the Credit Agreement bears interest at either: (1) LIBOR, plus an applicable margin of 1.45% based on our current credit rating; or (2) (a) the base rate which shall be the higher of the prime rate, the Federal Funds rate plus 0.50% or the LIBOR Market Index rate plus 1% , plus (b) an applicable margin of 0.45% based on our current credit rating. The Credit Agreement incurs an annual facility fee of 0.30% based on our current credit rating. This fee is paid on drawn and undrawn portions of the $1.4 billion revolving credit facility. As of March 31, 2019 , we had unused borrowing capacity of $1,307 million , net of $13 million of letters of credit, under the Credit Agreement. Our borrowing capacity may be limited by financial covenants set forth in the Credit Agreement. The financial covenants set forth in the Credit Agreement limit the Partnership's ability to incur incremental debt by the unused borrowing capacity of $1,307 million as of March 31, 2019 . Except in the case of a default, amounts borrowed under our Credit Agreement will not become due prior to the December 6, 2022 maturity date. Senior Notes and Junior Subordinated Notes Our senior notes and junior subordinated notes, collectively referred to as our debt securities, mature and become payable on their respective due dates, and are not subject to any sinking fund or mandatory redemption provisions. The senior notes are senior unsecured obligations that are guaranteed by the Partnership and rank equally in a right of payment with our other senior unsecured indebtedness, including indebtedness under our Credit Agreement, and the junior subordinated notes are unsecured and rank subordinate in right of payment to all of our existing and future senior indebtedness. The debt securities include an optional redemption whereby we may elect to redeem the notes, in whole or in part from time-to-time for a premium. Additionally, we may defer the payment of all or part of the interest on the junior subordinated notes for one or more periods up to 5 consecutive years. The underwriters’ fees and related expenses are recorded in our condensed consolidated balance sheets within the carrying amount of long-term debt and will be amortized over the term of the notes. The maturities of our debt as of March 31, 2019 are as follows: Debt Maturities (millions) 2019 $ 525 2020 600 2021 500 2022 430 2023 500 Thereafter 2,825 Total debt $ 5,380

Risk Management and Hedging Act

Risk Management and Hedging Activities	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Risk Management and Hedging Activities	Risk Management and Hedging Activities Our operations expose us to a variety of risks including but not limited to changes in the prices of commodities that we buy or sell, changes in interest rates, and the creditworthiness of each of our counterparties. We manage certain of these exposures with either physical or financial transactions. We have established a comprehensive risk management policy and a risk management committee (the Risk Management Committee), to monitor and manage market risks associated with commodity prices and counterparty credit. The Risk Management Committee is composed of senior executives who receive regular briefings on positions and exposures, credit exposures and overall risk management in the context of market activities. The Risk Management Committee is responsible for the overall management of credit risk and commodity price risk, including monitoring exposure limits. Collateral As of March 31, 2019 , we had cash deposits of $64 million , included in collateral cash deposits in our condensed consolidated balance sheets. Additionally, as of March 31, 2019 , we held letters of credit of $59 million from counterparties to secure their future performance under financial or physical contracts. Collateral amounts held or posted may be fixed or may vary, depending on the value of the underlying contracts, and could cover normal purchases and sales, services, trading and hedging contracts. In many cases, we and our counterparties have publicly disclosed credit ratings, which may impact the amounts of collateral requirements. Physical forward contracts and financial derivatives are generally cash settled at the expiration of the contract term. These transactions are generally subject to specific credit provisions within the contracts that would allow the seller, at its discretion, to suspend deliveries, cancel agreements or continue deliveries to the buyer after the buyer provides security for payment satisfactory to the seller . Offsetting Certain of our derivative instruments are subject to a master netting or similar arrangement, whereby we may elect to settle multiple positions with an individual counterparty through a single net payment. Each of our individual derivative instruments are presented on a gross basis on the condensed consolidated balance sheets, regardless of our ability to net settle our positions. Instruments that are governed by agreements that include net settle provisions allow final settlement, when presented with a termination event, of outstanding amounts by extinguishing the mutual debts owed between the parties in exchange for a net amount due. We have trade receivables and payables associated with derivative instruments, subject to master netting or similar agreements, which are not included in the table below. The following summarizes the gross and net amounts of our derivative instruments: March 31, 2019 December 31, 2018 Gross Amounts Amounts Not Net Gross Amounts Amounts Not Net (millions) Assets: Commodity derivatives $ 37 $ — $ 37 $ 116 $ — $ 116 Liabilities: Commodity derivatives $ (66 ) $ — $ (66 ) $ (99 ) $ — $ (99 ) Summarized Derivative Information The fair value of our derivative instruments that are marked-to-market each period, as well as the location of each within our condensed consolidated balance sheets, by major category, is summarized below. We have no derivative instruments that are designated as hedging instruments for accounting purposes as of March 31, 2019 and December 31, 2018 . Balance Sheet Line Item March 31, December 31, Balance Sheet Line Item March 31, December 31, (millions) (millions) Derivative Assets Not Designated as Hedging Instruments: Derivative Liabilities Not Designated as Hedging Instruments: Commodity derivatives: Commodity derivatives: Unrealized gains on derivative instruments — current $ 35 $ 108 Unrealized losses on derivative instruments — current $ (61 ) $ (91 ) Unrealized gains on derivative instruments — long-term 2 8 Unrealized losses on derivative instruments — long-term (5 ) (8 ) Total $ 37 $ 116 Total $ (66 ) $ (99 ) The following summarizes the balance and activity within AOCI relative to our interest rate, commodity and foreign currency cash flow hedges as of and for the three months ended March 31, 2019 : Interest Commodity Foreign Total (millions) Net deferred (losses) gains in AOCI (beginning balance) $ (3 ) $ (6 ) $ 1 $ (8 ) Net deferred (losses) gains in AOCI (ending balance) $ (3 ) $ (6 ) $ 1 $ (8 ) Deferred losses in AOCI expected to be reclassified into earnings over the next 12 months $ (1 ) $ — $ — $ (1 ) (a) Relates to Discovery Producer Services LLC ("Discovery"), an unconsolidated affiliate. The following summarizes the balance and activity within AOCI relative to our interest rate, commodity and foreign currency cash flow hedges as of and for the three months ended March 31, 2018 : Interest Commodity Foreign Total (millions) Net deferred (losses) gains in AOCI (beginning balance) $ (4 ) $ (6 ) $ 1 $ (9 ) Net deferred (losses) gains in AOCI (ending balance) $ (4 ) $ (6 ) $ 1 $ (9 ) (a) Relates to Discovery, an unconsolidated affiliate. For the three months ended March 31, 2019 and 2018 , no derivative losses attributable to the ineffective portion or to amounts excluded from effectiveness testing were recognized in trading and marketing gains or losses, net or interest expense in our condensed consolidated statements of operations. For the three months ended March 31, 2019 and 2018 , no derivative losses were reclassified from AOCI to trading and marketing gains or losses, net or interest expense as a result of the discontinuance of cash flow hedges related to certain forecasted transactions that are not probable of occurring. Changes in the value of derivative instruments, for which the hedge method of accounting has not been elected from one period to the next, are recorded in the condensed consolidated statements of operations. The following summarizes these amounts and the location within the condensed consolidated statements of operations that such amounts are reflected: Commodity Derivatives: Statements of Operations Line Item Three Months Ended March 31, 2019 2018 (millions) Realized gains (losses) $ 27 $ (12 ) Unrealized losses (54 ) (29 ) Trading and marketing losses, net $ (27 ) $ (41 ) We do not have any derivative financial instruments that qualify as a hedge of a net investment. The following tables represent, by commodity type, our net long or short positions that are expected to partially or entirely settle in each respective year. To the extent that we have long dated derivative positions that span multiple calendar years, the contract will appear in more than one line item in the tables below. March 31, 2019 Crude Oil Natural Gas Natural Gas Liquids Natural Gas Basis Swaps Year of Expiration Net Short Position (Bbls) Net Short Position (MMBtu) Net Short Position (Bbls) Net Long (Short) Position (MMBtu) 2019 (1,191,000 ) (32,148,650 ) (26,987,090 ) 2,102,500 2020 (283,000 ) (930,000 ) (14,388,830 ) 3,660,000 2021 (100,000 ) — (5,516,168 ) (3,650,000 ) 2022 — — (175 ) — March 31, 2018 Crude Oil Natural Gas Natural Gas Liquids Natural Gas Basis Swaps Year of Expiration Net Short Position (Bbls) Net Short Position (MMBtu) Net (Short) Long Position (Bbls) Net (Short) Long Position (MMBtu) 2018 (2,511,000 ) (20,737,300 ) (24,473,245 ) (3,850,000 ) 2019 (650,000 ) — (3,240,167 ) 2,402,500 2020 — — 231,548 3,660,000

Partnership Equity and Distribu

Partnership Equity and Distributions	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Partnership Equity and Distributions	Common Units — During the three months ended March 31, 2019 , we issued no common units pursuant to our at-the-market program. As of March 31, 2019 , $750 million of common units remained available for sale pursuant to our at-the-market program. Distributions — The following table presents our cash distributions paid in 2019 and 2018 : Payment Date Per Unit Distribution Total Cash Distribution (millions) Distributions to common unitholders February 14, 2019 $ 0.7800 $ 154 November 14, 2018 $ 0.7800 $ 155 August 14, 2018 $ 0.7800 $ 154 May 15, 2018 $ 0.7800 $ 155 February 14, 2018 $ 0.7800 $ 194 Distributions to Series A Preferred unitholders December 17, 2018 $ 36.8750 $ 18 June 15, 2018 $ 41.9965 $ 21 Distributions to Series B Preferred unitholders March 15, 2019 $ 0.4922 $ 3 December 17, 2018 $ 0.4922 $ 3 September 17, 2018 $ 0.6781 $ 4 Distributions to Series C Preferred unitholders January 15, 2019 $ 0.5576 $ 2

Net Income or Loss per Limited

Net Income or Loss per Limited Partner Unit	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Net Income or Loss per Limited Partner Unit	17. Net Income or Loss per Limited Partner UnitBasic and diluted net income or loss per limited partner unit (LPU) is calculated by dividing net income or loss allocable to limited partners, by the weighted-average number of LPUs outstanding during the period. Diluted net income or loss per LPU is computed based on the weighted average number of units plus the effect of potential dilutive units outstanding during the period using the two-class method.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities Litigation — We are not a party to any significant legal proceedings, but are a party to various administrative and regulatory proceedings and commercial disputes that have arisen in the ordinary course of our business. Management currently believes that the ultimate resolution of the foregoing matters, taken as a whole, and after consideration of amounts accrued, insurance coverage or other indemnification arrangements, will not have a material adverse effect on our results of operations, financial position, or cash flow. Insurance — Our insurance coverage is carried with third-party insurers and with an affiliate of Phillips 66. Our insurance coverage includes: (i) general liability insurance covering third-party exposures; (ii) statutory workers’ compensation insurance; (iii) automobile liability insurance for all owned, non-owned and hired vehicles; (iv) excess liability insurance above the established primary limits for general liability and automobile liability insurance; (v) property insurance, which covers the replacement value of real and personal property and includes business interruption; and (vi) insurance covering our directors and officers for acts related to our business activities. All coverage is subject to certain limits and deductibles, the terms and conditions of which are common for companies with similar types of operations. Environmental — The operation of pipelines, plants and other facilities for gathering, transporting, processing, treating, fractionating, or storing natural gas, NGLs and other products is subject to stringent and complex laws and regulations pertaining to health, safety and the environment. As an owner or operator of these facilities, we must comply with laws and regulations at the federal, state and, in some cases, local levels that relate to worker safety, pipeline safety, air and water quality, solid and hazardous waste management and disposal, and other environmental matters. The cost of planning, designing, constructing and operating pipelines, plants, and other facilities incorporates compliance with environmental laws and regulations, worker safety standards, and safety standards applicable to our various facilities. In addition, there is increasing focus from (i) regulatory bodies and communities, and through litigation, on hydraulic fracturing and the real or perceived environmental or public health impacts of this technique, which indirectly presents some risk to our available supply of natural gas and the resulting supply of NGLs, (ii) regulatory bodies regarding pipeline system safety which could impose additional regulatory burdens and increase the cost of our operations, (iii) state and federal regulatory officials regarding the emission of greenhouse gases, which could impose regulatory burdens and increase the cost of our operations, and (iv) regulatory bodies and communities that could prevent or delay the development of fossil fuel energy infrastructure such as pipelines, plants, and other facilities used in our business. Failure to comply with these various health, safety and environmental laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures, including citizen suits, which can include the assessment of monetary penalties, the imposition of remedial requirements, and the issuance of injunctions or restrictions on operation. Management believes that, based on currently known information, compliance with these existing laws and regulations will not have a material adverse effect on our results of operations, financial position or cash flows. The following pending proceedings involve governmental authorities under federal, state, and local laws regulating the discharge of materials into the environment. It is not possible for us to predict the final outcome of these pending proceedings; however, we do not expect the outcome of one or more of these proceedings to have a material adverse effect to our results of operations, financial position, or cash flows: • In March 2018, the New Mexico Environment Department ("NMED") issued two separate Notices of Violation ("NOV") relating to upset and malfunction event emissions at two of our gas processing plants. Following information exchanges and discussions with NMED regarding the events and the propriety of the alleged violations, on February 14, 2019 we entered into preliminary settlement agreements to resolve the alleged violations under each NOV for administrative penalties in the amount of $ 149,832 and $ 142,233 , respectively. We intend to mitigate a portion of each administrative penalty through the implementation of environmentally beneficial projects. • In April 2018, the Colorado Department of Public Health and Environment ("CDPHE") issued a Compliance Advisory in relation to an improperly permitted facility flare and related air emissions from flare operations at one of our gas processing plants that we self-disclosed to CDPHE in December 2017. Following information exchanges and discussions with CDPHE, during the first quarter of 2019, a resolution was proposed pursuant to which the plant's air permit would be revised to include the flare and emissions limits for such flare in addition to us paying an administrative penalty as well as an economic benefit payment generally covering the period when the flare was required to be included in the facility air permit, in a combined amount expected to be between approximately $375,000 and $420,000 . We are still evaluating and holding discussions with CDPHE as to the foregoing amounts and proposed settlement terms.

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Business Segments	Business Segments Our operations are organized into two reportable segments: (i) Logistics and Marketing and (ii) Gathering and Processing. These segments are monitored separately by management for performance against our internal forecast and are consistent with internal financial reporting. These segments have been identified based on the differing products and services, regulatory environment and the expertise required for these operations. Our Gathering and Processing reportable segment includes operating segments that have been aggregated based on the nature of the products and services provided. Gross margin is a performance measure utilized by management to monitor the operations of each segment. The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies included in Note 2 of the Notes to Consolidated Financial Statements in “Financial Statements and Supplementary Data” included as Item 8 in our Annual Report on Form 10-K for the year ended December 31, 2018. Our Logistics and Marketing segment includes transporting, trading, marketing, storing natural gas and NGLs, and fractionating NGLs. The operations of our wholesale propane business were included in our Logistics and Marketing segment through March 1, 2019. Our Gathering and Processing segment consists of gathering, compressing, treating, processing natural gas, producing and fractionating NGLs, and recovering condensate. The remainder of our business operations is presented as “Other,” and consists of unallocated corporate costs. Elimination of inter-segment transactions are reflected in the eliminations column. The following tables set forth our segment information: Three Months Ended March 31, 2019 : Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 2,045 $ 1,288 $ — $ (1,134 ) $ 2,199 Gross margin (a) $ 58 $ 337 $ — $ — $ 395 Operating and maintenance expense (9 ) (165 ) (4 ) — (178 ) Depreciation and amortization expense (3 ) (93 ) (7 ) — (103 ) General and administrative expense (3 ) (6 ) (58 ) — (67 ) Other expense, net — (5 ) — — (5 ) Loss on sale of assets, net (9 ) — — — (9 ) Earnings from unconsolidated affiliates 113 — — — 113 Interest expense — — (69 ) — (69 ) Income tax expense — — (1 ) — (1 ) Net income (loss) $ 147 $ 68 $ (139 ) $ — $ 76 Net income attributable to noncontrolling interests — (1 ) — — (1 ) Net income (loss) attributable to partners $ 147 $ 67 $ (139 ) $ — $ 75 Non-cash derivative mark-to-market (b) $ (18 ) $ (36 ) $ — $ — $ (54 ) Non-cash lower of cost or market adjustments $ 5 $ — $ — $ — $ 5 Capital expenditures $ 14 $ 165 $ 3 $ — $ 182 Investments in unconsolidated affiliates, net $ 131 $ — $ — $ — $ 131 Three Months Ended March 31, 2018 : Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 1,979 $ 1,286 $ — $ (1,126 ) $ 2,139 Gross margin (a) $ 18 $ 352 $ — $ — $ 370 Operating and maintenance expense (11 ) (148 ) (3 ) — (162 ) Depreciation and amortization expense (3 ) (84 ) (7 ) — (94 ) General and administrative expense (3 ) (4 ) (52 ) — (59 ) Other income (expense) 1 (3 ) — — (2 ) Earnings from unconsolidated affiliates 77 1 — — 78 Interest expense — — (67 ) — (67 ) Income tax expense — — (1 ) — (1 ) Net income (loss) $ 79 $ 114 $ (130 ) $ — $ 63 Net income attributable to noncontrolling interests — (1 ) — — (1 ) Net income (loss) attributable to partners $ 79 $ 113 $ (130 ) $ — $ 62 Non-cash derivative mark-to-market (b) $ (43 ) $ 14 $ — $ — $ (29 ) Capital expenditures $ 1 $ 120 $ 3 $ — $ 124 Investments in unconsolidated affiliates, net $ 59 $ 1 $ — $ — $ 60 March 31, December 31, 2019 2018 (millions) Segment long-term assets: Gathering and Processing $ 9,126 $ 9,058 Logistics and Marketing 3,692 3,661 Other (c) 287 276 Total long-term assets 13,105 12,995 Current assets 1,082 1,271 Total assets $ 14,187 $ 14,266 (a) Gross margin consists of total operating revenues, including commodity derivative activity, less purchases and related costs. Gross margin is viewed as a non-GAAP financial measure under the rules of the SEC, but is included as a supplemental disclosure because it is a primary performance measure used by management as it represents the results of product sales versus product purchases. As an indicator of our operating performance, gross margin should not be considered an alternative to, or more meaningful than, net income or net cash provided by operating activities as determined in accordance with GAAP. Our gross margin may not be comparable to a similarly titled measure of another company because other entities may not calculate gross margin in the same manner. (b) Non-cash commodity derivative mark-to-market is included in gross margin, along with cash settlements for our commodity derivative contracts. (c)

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2019
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Three Months Ended March 31, 2019 2018 (millions) Cash paid for interest: Cash paid for interest, net of amounts capitalized $ 65 $ 84 Non-cash investing and financing activities: Property, plant and equipment acquired with accounts payable and accrued liabilities $ 40 $ 54 Other non-cash activities: Operating lease assets arising from the implementation of Topic 842 $ 84 $ —

Condensed Consolidating Financi

Condensed Consolidating Financial Information	3 Months Ended
	Mar. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Consolidating Financial Information	Condensed Consolidating Financial Information The following condensed consolidating financial information presents the results of operations, financial position and cash flows of DCP Midstream, LP, or parent guarantor, DCP Midstream Operating LP, or subsidiary issuer, which is a 100% owned subsidiary, and non-guarantor subsidiaries, as well as the consolidating adjustments necessary to present DCP Midstream, LP’s results on a consolidated basis. The parent guarantor has agreed to fully and unconditionally guarantee debt securities of the subsidiary issuer. For the purpose of the following financial information, investments in subsidiaries are reflected in accordance with the equity method of accounting. The financial information may not necessarily be indicative of results of operations, cash flows, or financial position had the subsidiaries operated as independent entities. Condensed Consolidating Balance Sheets March 31, 2019 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) ASSETS Current assets: Cash and cash equivalents $ — $ — $ 1 $ — $ 1 Accounts receivable, net — — 914 — 914 Inventories — — 52 — 52 Other — — 115 — 115 Total current assets — — 1,082 — 1,082 Property, plant and equipment, net — — 9,110 — 9,110 Goodwill and intangible assets, net — — 271 — 271 Advances receivable — consolidated subsidiaries 2,293 1,870 — (4,163 ) — Investments in consolidated subsidiaries 4,893 8,255 — (13,148 ) — Investments in unconsolidated affiliates — — 3,460 — 3,460 Other long-term assets — — 264 — 264 Total assets $ 7,186 $ 10,125 $ 14,187 $ (17,311 ) $ 14,187 LIABILITIES AND EQUITY Accounts payable and other current liabilities $ 2 $ 71 $ 1,206 $ — $ 1,279 Current maturities of long-term debt — 925 200 — 1,125 Advances payable — consolidated subsidiaries — — 4,163 (4,163 ) — Long-term debt — 4,236 — — 4,236 Other long-term liabilities — — 334 — 334 Total liabilities 2 5,232 5,903 (4,163 ) 6,974 Commitments and contingent liabilities Equity: Partners’ equity: Net equity 7,184 4,896 8,260 (13,148 ) 7,192 Accumulated other comprehensive loss — (3 ) (5 ) — (8 ) Total partners’ equity 7,184 4,893 8,255 (13,148 ) 7,184 Noncontrolling interests — — 29 — 29 Total equity 7,184 4,893 8,284 (13,148 ) 7,213 Total liabilities and equity $ 7,186 $ 10,125 $ 14,187 $ (17,311 ) $ 14,187 Condensed Consolidating Balance Sheets December 31, 2018 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) ASSETS Current assets: Cash and cash equivalents $ — $ — $ 1 $ — $ 1 Accounts receivable, net — — 1,033 — 1,033 Inventories — — 79 — 79 Other — — 158 — 158 Total current assets — — 1,271 — 1,271 Property, plant and equipment, net — — 9,135 — 9,135 Goodwill and intangible assets, net — — 328 — 328 Advances receivable — consolidated subsidiaries 2,452 1,883 — (4,335 ) — Investments in consolidated subsidiaries 4,818 8,113 — (12,931 ) — Investments in unconsolidated affiliates — — 3,340 — 3,340 Other long-term assets — — 192 — 192 Total assets $ 7,270 $ 9,996 $ 14,266 $ (17,266 ) $ 14,266 LIABILITIES AND EQUITY Accounts payable and other current liabilities $ 2 $ 71 $ 1,306 $ — $ 1,379 Current maturities of long-term debt — 325 200 — 525 Advances payable — consolidated subsidiaries — — 4,335 (4,335 ) — Long-term debt — 4,782 — — 4,782 Other long-term liabilities — — 283 — 283 Total liabilities 2 5,178 6,124 (4,335 ) 6,969 Commitments and contingent liabilities Equity: Partners’ equity: Net equity 7,268 4,821 8,118 (12,931 ) 7,276 Accumulated other comprehensive loss — (3 ) (5 ) — (8 ) Total partners’ equity 7,268 4,818 8,113 (12,931 ) 7,268 Noncontrolling interests — — 29 — 29 Total equity 7,268 4,818 8,142 (12,931 ) 7,297 Total liabilities and equity $ 7,270 $ 9,996 $ 14,266 $ (17,266 ) $ 14,266 Condensed Consolidating Statement of Operations Three Months Ended March 31, 2019 Parent Guarantor Subsidiary Issuer Non- Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Operating revenues: Sales of natural gas, NGLs and condensate $ — $ — $ 2,111 $ — $ 2,111 Transportation, processing and other — — 115 — 115 Trading and marketing losses, net — — (27 ) — (27 ) Total operating revenues — — 2,199 — 2,199 Operating costs and expenses: Purchases and related costs — — 1,804 — 1,804 Operating and maintenance expense — — 178 — 178 Depreciation and amortization expense — — 103 — 103 General and administrative expense — — 67 — 67 Loss on sale of assets, net — — 9 — 9 Other expense, net — — 5 — 5 Total operating costs and expenses — — 2,166 — 2,166 Operating income — — 33 — 33 Interest expense, net — (67 ) (2 ) — (69 ) Income from consolidated subsidiaries 75 142 — (217 ) — Earnings from unconsolidated affiliates — — 113 — 113 Income before income taxes 75 75 144 (217 ) 77 Income tax expense — — (1 ) — (1 ) Net income 75 75 143 (217 ) 76 Net income attributable to noncontrolling interests — — (1 ) — (1 ) Net income attributable to partners $ 75 $ 75 $ 142 $ (217 ) $ 75 Condensed Consolidating Statement of Comprehensive Income Three Months Ended March 31, 2019 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Net income $ 75 $ 75 $ 143 $ (217 ) $ 76 Other comprehensive income: Total other comprehensive income — — — — — Total comprehensive income 75 75 143 (217 ) 76 Total comprehensive income attributable to noncontrolling interests — — (1 ) — (1 ) Total comprehensive income attributable to partners $ 75 $ 75 $ 142 $ (217 ) $ 75 Condensed Consolidating Statement of Operations Three Months Ended March 31, 2018 Parent Guarantor Subsidiary Issuer Non- Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Operating revenues: Sales of natural gas, NGLs and condensate $ — $ — $ 2,069 $ — $ 2,069 Transportation, processing and other — — 111 — 111 Trading and marketing losses, net — — (41 ) — (41 ) Total operating revenues — — 2,139 — 2,139 Operating costs and expenses: Purchases and related costs — — 1,769 — 1,769 Operating and maintenance expense — — 162 — 162 Depreciation and amortization expense — — 94 — 94 General and administrative expense — — 59 — 59 Other expense, net — — 2 — 2 Total operating costs and expenses — — 2,086 — 2,086 Operating income — — 53 — 53 Interest expense, net — (67 ) — — (67 ) Income from consolidated subsidiaries 62 129 — (191 ) — Earnings from unconsolidated affiliates — — 78 — 78 Income before income taxes 62 62 131 (191 ) 64 Income tax expense — — (1 ) — (1 ) Net income 62 62 130 (191 ) 63 Net income attributable to noncontrolling interests — — (1 ) — (1 ) Net income attributable to partners $ 62 $ 62 $ 129 $ (191 ) $ 62 Condensed Consolidating Statement of Comprehensive Income Three Months Ended March 31, 2018 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Net income $ 62 $ 62 $ 130 $ (191 ) $ 63 Other comprehensive income: Total other comprehensive income — — — — — Total comprehensive income 62 62 130 (191 ) 63 Total comprehensive income attributable to noncontrolling interests — — (1 ) — (1 ) Total comprehensive income attributable to partners $ 62 $ 62 $ 129 $ (191 ) $ 62 Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2019 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) OPERATING ACTIVITIES Net cash (used in) provided by operating activities $ — $ (66 ) $ 383 $ — $ 317 INVESTING ACTIVITIES: Intercompany transfers 159 13 — (172 ) — Capital expenditures — — (182 ) — (182 ) Investments in unconsolidated affiliates, net — — (131 ) — (131 ) Proceeds from sale of assets — — 103 — 103 Net cash provided by (used in) investing activities 159 13 (210 ) (172 ) (210 ) FINANCING ACTIVITIES: Intercompany transfers — — (172 ) 172 — Proceeds from debt — 1,402 — — 1,402 Payments of debt — (1,348 ) — — (1,348 ) Distributions to preferred limited partners (5 ) — — — (5 ) Distributions to limited partners and general partner (154 ) — — — (154 ) Distributions to noncontrolling interests — — (1 ) — (1 ) Other — (1 ) — — (1 ) Net cash (used in) provided by financing activities (159 ) 53 (173 ) 172 (107 ) Net change in cash and cash equivalents — — — — — Cash and cash equivalents, beginning of period — — 1 — 1 Cash and cash equivalents, end of period $ — $ — $ 1 $ — $ 1 Condensed Consolidating Statements of Cash Flows Three Months Ended March 31, 2018 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) OPERATING ACTIVITIES Net cash (used in) provided by operating activities $ — $ (84 ) $ 206 $ — $ 122 INVESTING ACTIVITIES: Intercompany transfers 194 (171 ) — (23 ) — Capital expenditures — — (124 ) — (124 ) Investments in unconsolidated affiliates, net — — (60 ) — (60 ) Proceeds from sale of assets — — 3 — 3 Net cash provided by (used in) investing activities 194 (171 ) (181 ) (23 ) (181 ) FINANCING ACTIVITIES: Intercompany transfers — — (23 ) 23 — Proceeds from long-term debt — 635 — — 635 Payments of debt — (535 ) — — (535 ) Distributions to limited partners and general partner (194 ) — — — (194 ) Distributions to noncontrolling interests — — (1 ) — (1 ) Net cash (used in) provided by financing activities (194 ) 100 (24 ) 23 (95 ) Net change in cash and cash equivalents — (155 ) 1 — (154 ) Cash and cash equivalents, beginning of period — 155 1 — 156 Cash and cash equivalents, end of period $ — $ — $ 2 $ — $ 2

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 23, 2019 , we announced that the board of directors of the General Partner declared a quarterly distribution on our common units of $0.78 per common unit. The distribution will be paid on May 15, 2019 to unitholders of record on May 3, 2019 . On the same date, we announced that the board of directors of the General Partner declared a semi-annual distribution on our Series A Preferred Units o f $36.8750 per unit. The distribution will be paid on June 17, 2019 to unitholders of record on June 3, 2019 . On the same date, the board of directors of the General Partner declared a quarterly distribution on our Series B and Series C Preferred Units of $0.4922 and $0.4969 per unit, respectively. The Series B distributions will be paid on June 17, 2019 to unitholders of record on June 3, 2019 . The Series C distribution will be paid on July 15, 2019 to unitholders of record on July 1, 2019 .

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP.
Equity Method Investments	Investments in greater than 20% owned affiliates that are not variable interest entities and where we do not have the ability to exercise control, and investments in less than 20%
Business Description and Basis of Presentation [Text Block]	The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP. All intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements in this Quarterly Report on Form 10-Q have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the SEC). Accordingly, these condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments, that are, in the opinion of management, necessary to present fairly the financial position and results of operations for the respective interim periods. Certain information and note disclosures normally included in our annual financial statements prepared in accordance with GAAP have been condensed or omitted from these interim financial statements pursuant to such rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading. Results of operations for the three months ended March 31, 2019

Updates to Significant Accoun_2

Updates to Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Updates to Significant Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Leases - Our leasing activity primarily consists of transportation agreements, office space, vehicles, compressors and field equipment. We determine if an arrangement is an operating or finance lease at inception. Right of use assets represent our right to use an underlying asset for the lease term when we control the use of the asset by obtaining substantially all of the economic benefits of the asset and direct the use of the asset. Lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease right of use assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. The interest rate used to calculate the present value of lease payments is the rate implicit in the lease when determinable or our incremental borrowing rate. Our incremental borrowing rate is primarily based on our collateralized borrowing rate when such borrowings exist or an estimated collateralized borrowing rate based on independent third party quotes when such borrowings do not exist. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease expense is recognized on a straight-line basis over the lease term.

New Accounting Pronouncements N

New Accounting Pronouncements New Accounting Pronouncements (Tables)	3 Months Ended
	Mar. 31, 2019
Impact of Adoption of ASC Topic 842 [Abstract]
Schedule of Cumulative Impact of Prospective Adoption of Accounting Policy [Table Text Block]	Balance at Adjustments due to Topic 842 Balance at December 31, 2018 January 1, 2019 (millions) Balance Sheet Operating lease assets $ — $ 84 $ 84 Current liabilities: Other $ 100 $ 25 $ 125 Operating lease liabilities $ — $ 66 $ 66 Other long-term liabilities $ 243 $ (7 ) $ 236

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	We disaggregate our revenue from contracts with customers by type of contract for each of our reportable segments, as we believe it best depicts the nature, timing and uncertainty of our revenue and cash flows. The following tables set forth our revenue by those categories: Three Months Ended March 31, 2019 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 637 $ 557 $ (498 ) $ 696 Sales of NGLs and condensate (a) 1,403 648 (636 ) 1,415 Transportation, processing and other 12 103 — 115 Trading and marketing losses, net (b) $ (7 ) $ (20 ) — (27 ) Total operating revenues $ 2,045 $ 1,288 $ (1,134 ) $ 2,199 Three Months Ended March 31, 2018 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 553 $ 446 $ (419 ) $ 580 Sales of NGLs and condensate (a) 1,456 740 (707 ) 1,489 Transportation, processing and other 14 97 — 111 Trading and marketing (losses) gains, net (b) $ (44 ) $ 3 — (41 ) Total operating revenues $ 1,979 $ 1,286 $ (1,126 ) $ 2,139 (a) Includes $ 858 million and $ 793 million for the three months ended March 31, 2019 and 2018 , respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our logistics and marketing segment, which are not within the scope of FASB ASU 2014-09 "Revenue from Contracts with Customers" (Topic 606).

Contract Liabilities (Tables)

Contract Liabilities (Tables)	3 Months Ended
	Mar. 31, 2019
Contract Assets and Liabilities [Abstract]
Contract with Customer, Asset and Liability [Table Text Block]	March 31, 2019 (millions) Balance, beginning of period $ 34 Revenue recognized (a) — Balance, end of period $ 34

Agreements and Transactions w_2

Agreements and Transactions with Affiliates (Tables)	3 Months Ended
	Mar. 31, 2019
Related Party Transaction [Line Items]
Schedule of Fees Incurred and Other Fees Paid	The following table summarizes employee related costs that were charged by DCP Midstream, LLC to the Partnership that are included in the condensed consolidated statements of operations: Three Months Ended March 31, 2019 2018 (millions) Employee related costs charged by DCP Midstream, LLC Operating and maintenance expense $ 49 $ 50 General and administrative expense $ 47 $ 38
Summary of Transactions with Affiliates	The following table summarizes our transactions with affiliates: Three Months Ended March 31, 2019 2018 (millions) Phillips 66 (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ 326 $ 302 Purchases and related costs from affiliates $ 45 $ 10 Operating and maintenance and general administrative expenses $ 4 $ 3 Enbridge (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ — $ 12 Purchases and related costs from affiliates $ 7 $ 10 Unconsolidated affiliates: Sales of natural gas, NGLs and condensate to affiliates $ 14 $ 11 Transportation, processing, and other to affiliates $ 1 $ 1 Purchases and related costs from affiliates $ 219 $ 145 We had balances with affiliates as follows: March 31, 2019 December 31, 2018 (millions) Phillips 66 (including its affiliates): Accounts receivable $ 146 $ 145 Accounts payable $ 28 $ 22 Enbridge (including its affiliates): Accounts payable $ 2 $ 2 Unconsolidated affiliates: Accounts receivable $ 30 $ 21 Accounts payable $ 86 $ 72

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories were as follows: March 31, 2019 December 31, 2018 (millions) Natural gas $ 23 $ 34 NGLs 29 45 Total inventories $ 52 $ 79

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Classification of Property, Plant and Equipment	A summary of property, plant and equipment by classification is as follows: Depreciable March 31, 2019 December 31, 2018 (millions) Gathering and transmission systems 20 — 50 Years $ 8,539 $ 8,492 Processing, storage and terminal facilities 35 — 60 Years 5,149 5,194 Other 3 — 30 Years 571 568 Construction work in progress 527 470 Property, plant and equipment 14,786 14,724 Accumulated depreciation (5,676 ) (5,589 ) Property, plant and equipment, net $ 9,110 $ 9,135

Goodwlll (Tables)

Goodwlll (Tables)	3 Months Ended
	Mar. 31, 2019
Goodwill Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	March 31, 2019 (millions) Gathering and Processing Logistics and Marketing Total Balance, beginning of period $ 159 $ 72 $ 231 Dispositions — (37 ) (37 ) Balance, end of period $ 159 $ 35 $ 194

Investments in Unconsolidated_2

Investments in Unconsolidated Affiliates (Tables)	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Affiliates	The following table summarizes our investments in unconsolidated affiliates: Carrying Value as of Percentage March 31, December 31, 2018 (millions) DCP Sand Hills Pipeline, LLC 66.67% $ 1,787 $ 1,791 DCP Southern Hills Pipeline, LLC 66.67% 731 728 Discovery Producer Services LLC 40.00% 339 344 Front Range Pipeline LLC 33.33% 185 175 Texas Express Pipeline LLC 10.00% 98 95 Gulf Coast Express Pipeline LLC 25.00% 257 146 Mont Belvieu Enterprise Fractionator 12.50% 27 24 Panola Pipeline Company, LLC 15.00% 22 23 Mont Belvieu 1 Fractionator 20.00% 10 10 Other Various 4 4 Total investments in unconsolidated affiliates $ 3,460 $ 3,340
Schedule Of Earnings From Investment In Unconsolidated Affiliates [Table Text Block]	Earnings from investments in unconsolidated affiliates were as follows: Three Months Ended March 31, 2019 2018 (millions) DCP Sand Hills Pipeline, LLC $ 68 $ 48 DCP Southern Hills Pipeline, LLC 23 13 Discovery Producer Services LLC — 1 Front Range Pipeline LLC 7 5 Texas Express Pipeline LLC 5 2 Mont Belvieu Enterprise Fractionator 4 4 Mont Belvieu 1 Fractionator 4 4 Other 2 1 Total earnings from unconsolidated affiliates $ 113 $ 78
Equity Method Investment Summarized Financial Information, Statement of Operations [Table Text Block]	The following tables summarize the combined financial information of our investments in unconsolidated affiliates: Three Months Ended March 31, 2019 2018 (millions) Statements of operations: Operating revenue $ 421 $ 334 Operating expenses $ 191 $ 139 Net income $ 231 $ 194
Equity Method Investment Summarized Financial Information Balance Sheet Table [Table Text Block]	March 31, December 31, (millions) Balance sheets: Current assets $ 327 $ 411 Long-term assets 6,941 6,359 Current liabilities (450 ) (424 ) Long-term liabilities (249 ) (221 ) Net assets $ 6,569 $ 6,125

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Financial Instruments Carried at Fair Value	March 31, 2019 December 31, 2018 Level 1 Level 2 Level 3 Total Carrying Value Level 1 Level 2 Level 3 Total Carrying Value (millions) Current assets: Commodity derivatives (a) $ 16 $ 14 $ 5 $ 35 $ 62 $ 32 $ 14 $ 108 Long-term assets: Commodity derivatives (b) $ — $ 1 $ 1 $ 2 $ 4 $ 2 $ 2 $ 8 Current liabilities: Commodity derivatives (c) $ (14 ) $ (46 ) $ (1 ) $ (61 ) $ (39 ) $ (52 ) $ — $ (91 ) Long-term liabilities: Commodity derivatives (d) $ — $ (4 ) $ (1 ) $ (5 ) $ (1 ) $ (5 ) $ (2 ) $ (8 ) (a) Included in current unrealized gains on derivative instruments in our condensed consolidated balance sheets. (b) Included in long-term unrealized gains on derivative instruments in our condensed consolidated balance sheets. (c) Included in current unrealized losses on derivative instruments in our condensed consolidated balance sheets. (d) Included in long-term unrealized losses on derivative instruments in our condensed consolidated balance sheets.
Fair Value Assets and Liabilities Measured On Recurring Basis Unobservable Input Reconciliation	Commodity Derivative Instruments Current Long-Term Current Long-Term (millions) Three months ended March 31, 2019 (a): Beginning balance $ 14 $ 2 $ — $ (2 ) Net unrealized (losses) gains included in earnings (b) (4 ) (1 ) (2 ) 1 Transfers out of Level 3 (c) (2 ) — — — Settlements (3 ) — 1 — Ending balance $ 5 $ 1 $ (1 ) $ (1 ) Net unrealized losses on derivatives still held included in earnings (b) $ — $ — $ (1 ) $ (1 ) Three months ended March 31, 2018 (a): Beginning balance $ 3 $ 1 $ (13 ) $ (1 ) Net unrealized (losses) gains included in earnings (b) — (1 ) 4 (2 ) Transfers out of Level 3 (c) — — 2 — Settlements (1 ) — 1 — Ending balance $ 2 $ — $ (6 ) $ (3 ) Net unrealized (losses) gains on derivatives still held included in earnings (b) $ — $ (1 ) $ 2 $ (2 ) (a) There were no purchases, issuances or sales of derivatives or transfers into Level 3 for the three months ended March 31, 2019 and 2018 . (b) Represents the amount of unrealized gains or losses for the period, included in trading and marketing gains (losses), net. (c) Amounts transferred out of Level 3 are reflected at fair value at the end of the period.
Schedule of Valuation Processes	March 31, 2019 Product Group Fair Value Forward Curve Range (millions) Assets NGLs $ 5 $0.24-$1.24 Per gallon Natural gas $ 1 $1.95-$2.58 Per MMBtu Liabilities NGLs $ (1 ) $0.13-$1.24 Per gallon Natural gas $ (1 ) $2.42-$2.86 Per MMBtu
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]	We determine the fair value of our fixed-rate senior notes and junior subordinated notes based on quotes obtained from bond dealers. The fair value of borrowings under the Credit Agreement (defined below) and the accounts receivable securitization facility (the Securitization Facility) are based on carrying value, which approximates fair value as their interest rates are based on prevailing market interest rates. We classify the fair values of our outstanding debt balances within Level 2 of the valuation hierarchy. As of March 31, 2019 and December 31, 2018 , the carrying value and fair value of our total debt, including current maturities, were as follows: March 31, 2019 December 31, 2018 Carrying Value (a) Fair Value Carrying Value (a) Fair Value (millions) Total debt $ 5,391 $ 5,476 $ 5,337 $ 5,170 (a) Excludes unamortized issuance costs.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Schedule of Leasing Assets and Liabilities [Table Text Block]	As of March 31, 2019 (millions) Operating lease assets $ 78 Operating lease liabilities $ 66 Other current liabilities 18 Total $ 84
Lease, Cost [Table Text Block]	Three months ended March 31, 2019 (millions) Operating lease cost $ 6 Variable lease cost 2 Short term lease cost 1 Total lease cost $ 9
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Three months ended March 31, 2019 (millions) 2019 - remainder $ 16 2020 22 2021 20 2022 15 2023 9 Thereafter 11 Total lease payments $ 93 Less imputed interest (9 ) Total operating lease liabilities $ 84
Leases - Other Information	Three months ended March 31, 2019 (millions) Cash paid for amounts included in the measurement of operating lease liabilities: $ 6 Right-of-use assets obtained in exchange for operating lease obligations following the adoption of Topic 842: $ 6 Other information related to operating leases as follows: Weighted average remaining lease term 6 years Weighted average discount rate 4.00 %
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]		Minimum rental payments under our various operating leases in the year indicated were as follows as of December 31, 2018 : Future Minimum Rental Payments as of December 31, 2018 (millions) 2019 $ 22 2020 18 2021 14 2022 9 2023 5 Thereafter 7 Total minimum rental payments $ 75

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Debt	March 31, 2019 December 31, 2018 (millions) Senior notes: Issued March 2014, interest at 2.700% payable semi-annually, due April 2019 325 325 Issued March 2010, interest at 5.350% payable semiannually, due March 2020 (a) 600 600 Issued September 2011, interest at 4.750% payable semiannually, due September 2021 500 500 Issued March 2012, interest at 4.950% payable semi-annually, due April 2022 350 350 Issued March 2013, interest at 3.875% payable semi-annually, due March 2023 500 500 Issued July 2018 and January 2019, interest at 5.375% payable semi-annually, due July 2025 825 500 Issued August 2000, interest at 8.125% payable semi-annually, due August 2030 (a) 300 300 Issued October 2006, interest at 6.450% payable semi-annually, due November 2036 300 300 Issued September 2007, interest at 6.750% payable semi-annually, due September 2037 450 450 Issued March 2014, interest at 5.600% payable semi-annually, due April 2044 400 400 Junior subordinated notes: Issued May 2013, interest at 5.850% payable semi-annually, due May 2043 550 550 Credit agreement: Revolving credit facility, weighted-average variable interest rate of 3.950%, as of March 31, 2019, due December 2022 80 351 Accounts receivable securitization facility: Accounts receivable securitization facility, weighted-average variable interest rate of 3.290% as of March 31, 2019, due August 2019 200 200 Fair value adjustments related to interest rate swap fair value hedges (a) 20 21 Unamortized issuance costs (30 ) (30 ) Unamortized discount (9 ) (10 ) Total debt 5,361 5,307 Current debt 1,125 525 Total long-term debt $ 4,236 $ 4,782 (a) The swaps associated with this debt were previously terminated. The remaining long-term fair value of approximately $20 million
Future Maturities of Long-Term Debt	The maturities of our debt as of March 31, 2019 are as follows: Debt Maturities (millions) 2019 $ 525 2020 600 2021 500 2022 430 2023 500 Thereafter 2,825 Total debt $ 5,380

Risk Management and Hedging A_2

Risk Management and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Gross and Net Amounts of Derivative Instruments	March 31, 2019 December 31, 2018 Gross Amounts Amounts Not Net Gross Amounts Amounts Not Net (millions) Assets: Commodity derivatives $ 37 $ — $ 37 $ 116 $ — $ 116 Liabilities: Commodity derivatives $ (66 ) $ — $ (66 ) $ (99 ) $ — $ (99 )
Schedule of Designated and Non-Designated Derivative Instruments in Statement of Financial Position, Fair Value	The fair value of our derivative instruments that are marked-to-market each period, as well as the location of each within our condensed consolidated balance sheets, by major category, is summarized below. We have no derivative instruments that are designated as hedging instruments for accounting purposes as of March 31, 2019 and December 31, 2018 . Balance Sheet Line Item March 31, December 31, Balance Sheet Line Item March 31, December 31, (millions) (millions) Derivative Assets Not Designated as Hedging Instruments: Derivative Liabilities Not Designated as Hedging Instruments: Commodity derivatives: Commodity derivatives: Unrealized gains on derivative instruments — current $ 35 $ 108 Unrealized losses on derivative instruments — current $ (61 ) $ (91 ) Unrealized gains on derivative instruments — long-term 2 8 Unrealized losses on derivative instruments — long-term (5 ) (8 ) Total $ 37 $ 116 Total $ (66 ) $ (99 )
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following summarizes the balance and activity within AOCI relative to our interest rate, commodity and foreign currency cash flow hedges as of and for the three months ended March 31, 2019 : Interest Commodity Foreign Total (millions) Net deferred (losses) gains in AOCI (beginning balance) $ (3 ) $ (6 ) $ 1 $ (8 ) Net deferred (losses) gains in AOCI (ending balance) $ (3 ) $ (6 ) $ 1 $ (8 ) Deferred losses in AOCI expected to be reclassified into earnings over the next 12 months $ (1 ) $ — $ — $ (1 ) (a) Relates to Discovery Producer Services LLC ("Discovery"), an unconsolidated affiliate. The following summarizes the balance and activity within AOCI relative to our interest rate, commodity and foreign currency cash flow hedges as of and for the three months ended March 31, 2018 : Interest Commodity Foreign Total (millions) Net deferred (losses) gains in AOCI (beginning balance) $ (4 ) $ (6 ) $ 1 $ (9 ) Net deferred (losses) gains in AOCI (ending balance) $ (4 ) $ (6 ) $ 1 $ (9 ) (a) Relates to Discovery, an unconsolidated affiliate.
Schedule of Changes in Derivative Instruments Not Designated as Hedging Instruments	Changes in the value of derivative instruments, for which the hedge method of accounting has not been elected from one period to the next, are recorded in the condensed consolidated statements of operations. The following summarizes these amounts and the location within the condensed consolidated statements of operations that such amounts are reflected:
Schedule of Net Long or Short Positions Expected to be Realized	The following tables represent, by commodity type, our net long or short positions that are expected to partially or entirely settle in each respective year. To the extent that we have long dated derivative positions that span multiple calendar years, the contract will appear in more than one line item in the tables below.

Partnership Equity and Distri_2

Partnership Equity and Distributions (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Cash Distribution	ommon Units — During the three months ended March 31, 2019 , we issued no common units pursuant to our at-the-market program. As of March 31, 2019 , $750 million of common units remained available for sale pursuant to our at-the-market program. Distributions — The following table presents our cash distributions paid in 2019 and 2018 : Payment Date Per Unit Distribution Total Cash Distribution (millions) Distributions to common unitholders February 14, 2019 $ 0.7800 $ 154 November 14, 2018 $ 0.7800 $ 155 August 14, 2018 $ 0.7800 $ 154 May 15, 2018 $ 0.7800 $ 155 February 14, 2018 $ 0.7800 $ 194 Distributions to Series A Preferred unitholders December 17, 2018 $ 36.8750 $ 18 June 15, 2018 $ 41.9965 $ 21 Distributions to Series B Preferred unitholders March 15, 2019 $ 0.4922 $ 3 December 17, 2018 $ 0.4922 $ 3 September 17, 2018 $ 0.6781 $ 4 Distributions to Series C Preferred unitholders January 15, 2019 $ 0.5576 $ 2

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Information	Three Months Ended March 31, 2019 : Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 2,045 $ 1,288 $ — $ (1,134 ) $ 2,199 Gross margin (a) $ 58 $ 337 $ — $ — $ 395 Operating and maintenance expense (9 ) (165 ) (4 ) — (178 ) Depreciation and amortization expense (3 ) (93 ) (7 ) — (103 ) General and administrative expense (3 ) (6 ) (58 ) — (67 ) Other expense, net — (5 ) — — (5 ) Loss on sale of assets, net (9 ) — — — (9 ) Earnings from unconsolidated affiliates 113 — — — 113 Interest expense — — (69 ) — (69 ) Income tax expense — — (1 ) — (1 ) Net income (loss) $ 147 $ 68 $ (139 ) $ — $ 76 Net income attributable to noncontrolling interests — (1 ) — — (1 ) Net income (loss) attributable to partners $ 147 $ 67 $ (139 ) $ — $ 75 Non-cash derivative mark-to-market (b) $ (18 ) $ (36 ) $ — $ — $ (54 ) Non-cash lower of cost or market adjustments $ 5 $ — $ — $ — $ 5 Capital expenditures $ 14 $ 165 $ 3 $ — $ 182 Investments in unconsolidated affiliates, net $ 131 $ — $ — $ — $ 131 Three Months Ended March 31, 2018 : Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 1,979 $ 1,286 $ — $ (1,126 ) $ 2,139 Gross margin (a) $ 18 $ 352 $ — $ — $ 370 Operating and maintenance expense (11 ) (148 ) (3 ) — (162 ) Depreciation and amortization expense (3 ) (84 ) (7 ) — (94 ) General and administrative expense (3 ) (4 ) (52 ) — (59 ) Other income (expense) 1 (3 ) — — (2 ) Earnings from unconsolidated affiliates 77 1 — — 78 Interest expense — — (67 ) — (67 ) Income tax expense — — (1 ) — (1 ) Net income (loss) $ 79 $ 114 $ (130 ) $ — $ 63 Net income attributable to noncontrolling interests — (1 ) — — (1 ) Net income (loss) attributable to partners $ 79 $ 113 $ (130 ) $ — $ 62 Non-cash derivative mark-to-market (b) $ (43 ) $ 14 $ — $ — $ (29 ) Capital expenditures $ 1 $ 120 $ 3 $ — $ 124 Investments in unconsolidated affiliates, net $ 59 $ 1 $ — $ — $ 60 March 31, December 31, 2019 2018 (millions) Segment long-term assets: Gathering and Processing $ 9,126 $ 9,058 Logistics and Marketing 3,692 3,661 Other (c) 287 276 Total long-term assets 13,105 12,995 Current assets 1,082 1,271 Total assets $ 14,187 $ 14,266 (a) Gross margin consists of total operating revenues, including commodity derivative activity, less purchases and related costs. Gross margin is viewed as a non-GAAP financial measure under the rules of the SEC, but is included as a supplemental disclosure because it is a primary performance measure used by management as it represents the results of product sales versus product purchases. As an indicator of our operating performance, gross margin should not be considered an alternative to, or more meaningful than, net income or net cash provided by operating activities as determined in accordance with GAAP. Our gross margin may not be comparable to a similarly titled measure of another company because other entities may not calculate gross margin in the same manner. (b) Non-cash commodity derivative mark-to-market is included in gross margin, along with cash settlements for our commodity derivative contracts. (c)

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2019
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Summary of Supplemental Cash Flow Information	Three Months Ended March 31, 2019 2018 (millions) Cash paid for interest: Cash paid for interest, net of amounts capitalized $ 65 $ 84 Non-cash investing and financing activities: Property, plant and equipment acquired with accounts payable and accrued liabilities $ 40 $ 54 Other non-cash activities: Operating lease assets arising from the implementation of Topic 842 $ 84 $ —

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets March 31, 2019 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) ASSETS Current assets: Cash and cash equivalents $ — $ — $ 1 $ — $ 1 Accounts receivable, net — — 914 — 914 Inventories — — 52 — 52 Other — — 115 — 115 Total current assets — — 1,082 — 1,082 Property, plant and equipment, net — — 9,110 — 9,110 Goodwill and intangible assets, net — — 271 — 271 Advances receivable — consolidated subsidiaries 2,293 1,870 — (4,163 ) — Investments in consolidated subsidiaries 4,893 8,255 — (13,148 ) — Investments in unconsolidated affiliates — — 3,460 — 3,460 Other long-term assets — — 264 — 264 Total assets $ 7,186 $ 10,125 $ 14,187 $ (17,311 ) $ 14,187 LIABILITIES AND EQUITY Accounts payable and other current liabilities $ 2 $ 71 $ 1,206 $ — $ 1,279 Current maturities of long-term debt — 925 200 — 1,125 Advances payable — consolidated subsidiaries — — 4,163 (4,163 ) — Long-term debt — 4,236 — — 4,236 Other long-term liabilities — — 334 — 334 Total liabilities 2 5,232 5,903 (4,163 ) 6,974 Commitments and contingent liabilities Equity: Partners’ equity: Net equity 7,184 4,896 8,260 (13,148 ) 7,192 Accumulated other comprehensive loss — (3 ) (5 ) — (8 ) Total partners’ equity 7,184 4,893 8,255 (13,148 ) 7,184 Noncontrolling interests — — 29 — 29 Total equity 7,184 4,893 8,284 (13,148 ) 7,213 Total liabilities and equity $ 7,186 $ 10,125 $ 14,187 $ (17,311 ) $ 14,187 Condensed Consolidating Balance Sheets December 31, 2018 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) ASSETS Current assets: Cash and cash equivalents $ — $ — $ 1 $ — $ 1 Accounts receivable, net — — 1,033 — 1,033 Inventories — — 79 — 79 Other — — 158 — 158 Total current assets — — 1,271 — 1,271 Property, plant and equipment, net — — 9,135 — 9,135 Goodwill and intangible assets, net — — 328 — 328 Advances receivable — consolidated subsidiaries 2,452 1,883 — (4,335 ) — Investments in consolidated subsidiaries 4,818 8,113 — (12,931 ) — Investments in unconsolidated affiliates — — 3,340 — 3,340 Other long-term assets — — 192 — 192 Total assets $ 7,270 $ 9,996 $ 14,266 $ (17,266 ) $ 14,266 LIABILITIES AND EQUITY Accounts payable and other current liabilities $ 2 $ 71 $ 1,306 $ — $ 1,379 Current maturities of long-term debt — 325 200 — 525 Advances payable — consolidated subsidiaries — — 4,335 (4,335 ) — Long-term debt — 4,782 — — 4,782 Other long-term liabilities — — 283 — 283 Total liabilities 2 5,178 6,124 (4,335 ) 6,969 Commitments and contingent liabilities Equity: Partners’ equity: Net equity 7,268 4,821 8,118 (12,931 ) 7,276 Accumulated other comprehensive loss — (3 ) (5 ) — (8 ) Total partners’ equity 7,268 4,818 8,113 (12,931 ) 7,268 Noncontrolling interests — — 29 — 29 Total equity 7,268 4,818 8,142 (12,931 ) 7,297 Total liabilities and equity $ 7,270 $ 9,996 $ 14,266 $ (17,266 ) $ 14,266
Condensed Income Statement	Condensed Consolidating Statement of Operations Three Months Ended March 31, 2019 Parent Guarantor Subsidiary Issuer Non- Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Operating revenues: Sales of natural gas, NGLs and condensate $ — $ — $ 2,111 $ — $ 2,111 Transportation, processing and other — — 115 — 115 Trading and marketing losses, net — — (27 ) — (27 ) Total operating revenues — — 2,199 — 2,199 Operating costs and expenses: Purchases and related costs — — 1,804 — 1,804 Operating and maintenance expense — — 178 — 178 Depreciation and amortization expense — — 103 — 103 General and administrative expense — — 67 — 67 Loss on sale of assets, net — — 9 — 9 Other expense, net — — 5 — 5 Total operating costs and expenses — — 2,166 — 2,166 Operating income — — 33 — 33 Interest expense, net — (67 ) (2 ) — (69 ) Income from consolidated subsidiaries 75 142 — (217 ) — Earnings from unconsolidated affiliates — — 113 — 113 Income before income taxes 75 75 144 (217 ) 77 Income tax expense — — (1 ) — (1 ) Net income 75 75 143 (217 ) 76 Net income attributable to noncontrolling interests — — (1 ) — (1 ) Net income attributable to partners $ 75 $ 75 $ 142 $ (217 ) $ 75 Condensed Consolidating Statement of Operations Three Months Ended March 31, 2018 Parent Guarantor Subsidiary Issuer Non- Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Operating revenues: Sales of natural gas, NGLs and condensate $ — $ — $ 2,069 $ — $ 2,069 Transportation, processing and other — — 111 — 111 Trading and marketing losses, net — — (41 ) — (41 ) Total operating revenues — — 2,139 — 2,139 Operating costs and expenses: Purchases and related costs — — 1,769 — 1,769 Operating and maintenance expense — — 162 — 162 Depreciation and amortization expense — — 94 — 94 General and administrative expense — — 59 — 59 Other expense, net — — 2 — 2 Total operating costs and expenses — — 2,086 — 2,086 Operating income — — 53 — 53 Interest expense, net — (67 ) — — (67 ) Income from consolidated subsidiaries 62 129 — (191 ) — Earnings from unconsolidated affiliates — — 78 — 78 Income before income taxes 62 62 131 (191 ) 64 Income tax expense — — (1 ) — (1 ) Net income 62 62 130 (191 ) 63 Net income attributable to noncontrolling interests — — (1 ) — (1 ) Net income attributable to partners $ 62 $ 62 $ 129 $ (191 ) $ 62
Condensed Statement of Comprehensive Income	Condensed Consolidating Statement of Comprehensive Income Three Months Ended March 31, 2019 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Net income $ 75 $ 75 $ 143 $ (217 ) $ 76 Other comprehensive income: Total other comprehensive income — — — — — Total comprehensive income 75 75 143 (217 ) 76 Total comprehensive income attributable to noncontrolling interests — — (1 ) — (1 ) Total comprehensive income attributable to partners $ 75 $ 75 $ 142 $ (217 ) $ 75 Condensed Consolidating Statement of Comprehensive Income Three Months Ended March 31, 2018 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) Net income $ 62 $ 62 $ 130 $ (191 ) $ 63 Other comprehensive income: Total other comprehensive income — — — — — Total comprehensive income 62 62 130 (191 ) 63 Total comprehensive income attributable to noncontrolling interests — — (1 ) — (1 ) Total comprehensive income attributable to partners $ 62 $ 62 $ 129 $ (191 ) $ 62
Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2019 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) OPERATING ACTIVITIES Net cash (used in) provided by operating activities $ — $ (66 ) $ 383 $ — $ 317 INVESTING ACTIVITIES: Intercompany transfers 159 13 — (172 ) — Capital expenditures — — (182 ) — (182 ) Investments in unconsolidated affiliates, net — — (131 ) — (131 ) Proceeds from sale of assets — — 103 — 103 Net cash provided by (used in) investing activities 159 13 (210 ) (172 ) (210 ) FINANCING ACTIVITIES: Intercompany transfers — — (172 ) 172 — Proceeds from debt — 1,402 — — 1,402 Payments of debt — (1,348 ) — — (1,348 ) Distributions to preferred limited partners (5 ) — — — (5 ) Distributions to limited partners and general partner (154 ) — — — (154 ) Distributions to noncontrolling interests — — (1 ) — (1 ) Other — (1 ) — — (1 ) Net cash (used in) provided by financing activities (159 ) 53 (173 ) 172 (107 ) Net change in cash and cash equivalents — — — — — Cash and cash equivalents, beginning of period — — 1 — 1 Cash and cash equivalents, end of period $ — $ — $ 1 $ — $ 1 Condensed Consolidating Statements of Cash Flows Three Months Ended March 31, 2018 Parent Guarantor Subsidiary Issuer Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated (millions) OPERATING ACTIVITIES Net cash (used in) provided by operating activities $ — $ (84 ) $ 206 $ — $ 122 INVESTING ACTIVITIES: Intercompany transfers 194 (171 ) — (23 ) — Capital expenditures — — (124 ) — (124 ) Investments in unconsolidated affiliates, net — — (60 ) — (60 ) Proceeds from sale of assets — — 3 — 3 Net cash provided by (used in) investing activities 194 (171 ) (181 ) (23 ) (181 ) FINANCING ACTIVITIES: Intercompany transfers — — (23 ) 23 — Proceeds from long-term debt — 635 — — 635 Payments of debt — (535 ) — — (535 ) Distributions to limited partners and general partner (194 ) — — — (194 ) Distributions to noncontrolling interests — — (1 ) — (1 ) Net cash (used in) provided by financing activities (194 ) 100 (24 ) 23 (95 ) Net change in cash and cash equivalents — (155 ) 1 — (154 ) Cash and cash equivalents, beginning of period — 155 1 — 156 Cash and cash equivalents, end of period $ — $ — $ 2 $ — $ 2

Description of Business and B_3

Description of Business and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019
Investments in Greater Than 20%
Business Acquisition [Line Items]
Equity method ownership investment (as percent)	20.00%
Investments in Less Than 20%
Business Acquisition [Line Items]
Equity method ownership investment (as percent)	20.00%
DCP Midstream, LLC | DCP Midstream GP, LLC
Business Acquisition [Line Items]
Ownership interest percentage by parent	100.00%
DCP Midstream, LLC | DCP Midstream LP
Business Acquisition [Line Items]
Ownership interest percentage by parent	38.10%
Phillips 66 | DCP Midstream, LLC
Business Acquisition [Line Items]
Ownership interest percentage by parent	50.00%
Enbridge | DCP Midstream, LLC
Business Acquisition [Line Items]
Ownership interest percentage by parent	50.00%

New Accounting Pronouncements I

New Accounting Pronouncements Impact of Adoption of ASC Topic 842 (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Item Effected [Line Items]
Operating Lease, Right-of-Use Asset	$ 78		$ 0
Cumulative Effect of New Accounting Principle in Period of Adoption	84		0
Other	96		100
Operating Lease, Liability, Current	18
Operating Lease, Liability, Noncurrent	66		0
Other long-term liabilities	$ 231		$ 243
Accounting Standards Update 2016-02 [Member]
Item Effected [Line Items]
Operating Lease, Liability, Current		$ 25
Operating Lease, Liability, Noncurrent		66
Other long-term liabilities		(7)
Balance Subsequent to Topic 842 Adjustment [Member]
Item Effected [Line Items]
Operating Lease, Right-of-Use Asset		84
Other		125
Operating Lease, Liability, Noncurrent		66
Other long-term liabilities		$ 236

Dispositions (Details)

Dispositions (Details) $ in Millions	Jan. 30, 2019USD ($)
Discontinued Operations and Disposal Groups [Abstract]
Proceeds from Divestiture of Businesses	$ 90
Proceeds from Sales of Business and Related Inventory Assets	103
Loss on Disposition of Business	$ 9

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	$ 115	$ 111
Trading and marketing losses, net	(27)	(41)
Total operating revenues	2,199	2,139
Revenue, Remaining Performance Obligation, Amount	212
Revenue from contract with customer not within the scope of Topic 606	858	793
Natural Gas
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	696	580
NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	1,415	1,489
Logistics and Marketing
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	12	14
Trading and marketing losses, net	(7)	(44)
Total operating revenues	2,045	1,979
Logistics and Marketing | Natural Gas
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	637	553
Logistics and Marketing | NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	1,403	1,456
Eliminations
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate		0
Trading and marketing losses, net		0
Total operating revenues	(1,134)	(1,126)
Eliminations | Natural Gas
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	(498)	(419)
Eliminations | NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	(636)	(707)
Gathering and Processing
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	103	97
Trading and marketing losses, net	(20)	3
Total operating revenues	1,288	1,286
Gathering and Processing | Natural Gas
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	557	446
Gathering and Processing | NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	$ 648	$ 740

Contract Liabilities (Details)

Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Contract Assets and Liabilities [Abstract]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	35 years
Contract with Customer, Liability	$ 34	$ 34
Contract with Customer, Liability, Revenue Recognized	$ 0

Agreements and Transactions w_3

Agreements and Transactions with Affiliates - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Expense
Related Party Transaction [Line Items]
Labor and related expense	$ 49	$ 50
General and Administrative Expense
Related Party Transaction [Line Items]
Labor and related expense	$ 47	$ 38

Agreements and Transactions w_4

Agreements and Transactions with Affiliates - Transactions with Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Related Party Transaction [Line Items]
Purchases and related costs	$ 1,804	$ 1,769
Sales of natural gas, NGLs and condensate	115	111
Operating and maintenance expense	178	162
Affiliated Entity | Unconsolidated Affiliates
Related Party Transaction [Line Items]
Purchases and related costs	219	145
Affiliated Entity | Phillips 66
Related Party Transaction [Line Items]
Purchases and related costs	45	10
Operating and maintenance expense	4	3
Affiliated Entity | Enbridge
Related Party Transaction [Line Items]
Purchases and related costs	7	10
Natural Gas, NGLs and Condensate [Member]
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	2,111	2,069
Natural Gas, NGLs and Condensate [Member] | Affiliated Entity | Unconsolidated Affiliates
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	14	11
Natural Gas, NGLs and Condensate [Member] | Affiliated Entity | Phillips 66
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	326	302
Natural Gas, NGLs and Condensate [Member] | Affiliated Entity | Enbridge
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	0	12
Transportation, Processing and Other [Member]
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	115	111
Transportation, Processing and Other [Member] | Affiliated Entity | Unconsolidated Affiliates
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	$ 1	$ 1

Agreements and Transactions w_5

Agreements and Transactions with Affiliates - Balances with Affiliates (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Accounts receivable	$ 176	$ 166
Accounts payable	116	96
Unconsolidated Affiliates
Related Party Transaction [Line Items]
Accounts receivable	30	21
Accounts payable	86	72
Phillips 66
Related Party Transaction [Line Items]
Accounts receivable	146	145
Accounts payable	28	22
Enbridge
Related Party Transaction [Line Items]
Accounts payable	$ 2	$ 2

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Components Of Inventory [Line Items]
Total inventories	$ 52	$ 79
Natural Gas
Components Of Inventory [Line Items]
Total inventories	23	34
Natural Gas Liquids
Components Of Inventory [Line Items]
Total inventories	$ 29	$ 45

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Inventory Disclosure [Abstract]
Lower of cost or market adjustment	$ 5	$ 0

Property, Plant and Equipment -

Property, Plant and Equipment - Classification of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 14,786	$ 14,724
Accumulated depreciation	(5,676)	(5,589)
Property, plant and equipment, net	9,110	9,135
Gathering and transmission systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 8,539	8,492
Gathering and transmission systems | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	20 years
Gathering and transmission systems | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	50 years
Processing, storage and terminal facilities
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,149	5,194
Processing, storage and terminal facilities | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	35 years
Processing, storage and terminal facilities | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	60 years
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 571	568
Other | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	3 years
Other | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	30 years
Construction work in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 527	$ 470

Property, Plant and Equipment_2

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Interest capitalized on construction projects	$ 5	$ 5
Depreciation expense	$ 101	$ 92

Goodwlll (Details)

Goodwlll (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	$ 37
Goodwill	194	$ 231
Gathering and Processing
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	0
Operating Segments | Gathering and Processing
Goodwill [Line Items]
Goodwill	159	159
Operating Segments | Logistics and Marketing
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	37
Goodwill	$ 35	$ 72

Investments In Unconsolidated_3

Investments In Unconsolidated Affiliates - Investments In Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 3,460	$ 3,340
DCP Sand Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	66.67%
Investments in unconsolidated affiliates	$ 1,787	1,791
DCP Southern Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	66.67%
Investments in unconsolidated affiliates	$ 731	728
Discovery Producer Services LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	40.00%
Investments in unconsolidated affiliates	$ 339	344
Front Range Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	33.33%
Investments in unconsolidated affiliates	$ 185	175
Texas Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	10.00%
Investments in unconsolidated affiliates	$ 98	95
Panola Pipeline Company, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	15.00%
Investments in unconsolidated affiliates	$ 22	23
Mont Belvieu Enterprise Fractionator
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	12.50%
Investments in unconsolidated affiliates	$ 27	24
Gulf Coast Express [Member]
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	25.00%
Investments in unconsolidated affiliates	$ 257	146
Mont Belvieu 1 Fractionator
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	20.00%
Investments in unconsolidated affiliates	$ 10	10
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 4	$ 4

Investments in Unconsolidated_4

Investments in Unconsolidated Affiliates - Earnings from Investments in Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	$ 113	$ 78
DCP Sand Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	68	48
DCP Southern Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	23	13
Discovery Producer Services LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	0	1
Front Range Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	7	5
Texas Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	5	2
Mont Belvieu Enterprise Fractionator
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	4	4
Mont Belvieu 1 Fractionator
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	4	4
Other
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	$ 2	$ 1

Investments in Unconsolidated_5

Investments in Unconsolidated Affiliates - Equity Method Investment Summarized Financial Information, Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Operating revenue	$ 421	$ 334
Operating expenses	191	139
Net income	$ 231	$ 194

Investments in Unconsolidated_6

Investments in Unconsolidated Affiliates - Equity Method Investment Summarized Financial Information, Balance Sheet (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 327	$ 411
Long-term assets	6,941	6,359
Current liabilities	(450)	(424)
Long-term liabilities	(249)	(221)
Net assets	$ 6,569	$ 6,125

Fair Value Measurement - Financ

Fair Value Measurement - Financial Instruments Carried at Fair Value (Detail) - Commodity derivatives - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	$ 35	$ 108
Long- Term Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	2	8
Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	(61)	(91)
Long- Term Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	(5)	(8)
Level 1 | Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	16	62
Level 1 | Long- Term Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	0	4
Level 1 | Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	(14)	(39)
Level 1 | Long- Term Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	0	(1)
Level 2 | Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	14	32
Level 2 | Long- Term Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	1	2
Level 2 | Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	(46)	(52)
Level 2 | Long- Term Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	(4)	(5)
Level 3 | Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	5	14
Level 3 | Long- Term Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	1	2
Level 3 | Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	(1)	0
Level 3 | Long- Term Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives	$ (1)	$ 2

Fair Value Measurement - Conden

Fair Value Measurement - Condensed Consolidated Balance Sheets for Derivative Financial Instruments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Current Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 14	$ 3
Net realized and unrealized gains (losses) included in earnings	(4)	0
Transfers out of Level 3	(2)	0
Settlements	(3)	(1)
Ending balance	5	2
Net unrealized gains (losses) on derivatives still held included in earnings	0	0
Long- Term Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2	1
Net realized and unrealized gains (losses) included in earnings	(1)	(1)
Transfers out of Level 3	0	0
Settlements	0	0
Ending balance	1	0
Net unrealized gains (losses) on derivatives still held included in earnings	0	(1)
Current Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	(13)
Net realized and unrealized (losses) gains included in earnings	(2)	4
Transfers out of Level 3	0	2
Settlements	1	1
Ending balance	(1)	(6)
Net unrealized gains (losses) on derivatives still held included in earnings	(1)	2
Long- Term Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(2)	(1)
Net realized and unrealized (losses) gains included in earnings	1	(2)
Transfers out of Level 3	0	0
Settlements	0	0
Ending balance	(1)	(3)
Net unrealized gains (losses) on derivatives still held included in earnings	$ (1)	$ (2)

Fair Value Measurement Schedule

Fair Value Measurement Schedule of Valuation Processes (Detail) - Level 3 - Market Approach Valuation Technique $ in Millions	Mar. 31, 2019USD ($)$ / gal
Derivative Liabilities | Natural Gas Liquids
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Liabilities, fair value | $	$ (1)
Derivative Liabilities | Natural Gas Liquids | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	0.13
Derivative Liabilities | Natural Gas Liquids | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	1.24
Derivative Liabilities | Natural Gas
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Liabilities, fair value | $	$ (1)
Derivative Liabilities | Natural Gas | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	2.42
Derivative Liabilities | Natural Gas | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	2.86
Derivative Assets | Natural Gas Liquids
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Assets, fair value | $	$ 5
Derivative Assets | Natural Gas Liquids | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	0.24
Derivative Assets | Natural Gas Liquids | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	1.24
Derivative Assets | Natural Gas
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Assets, fair value | $	$ 1
Derivative Assets | Natural Gas | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	1.95
Derivative Assets | Natural Gas | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward Curve Range	2.58

Fair Value Measurement Carrying

Fair Value Measurement Carrying Value and Fair Value of Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Total Debt, Carrying Value	$ 5,391	$ 5,337
Total Debt, Fair Value	$ 5,476	$ 5,170

Leases (Details)

Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Leases [Abstract]
Operating Leases, Rent Expense		$ 8
Operating Lease, Payments	$ 6
Operating Lease, Cost	$ 6
Minimum Remaining Operating Lease Term	1 year
Operating Lease, Right-of-Use Asset	$ 78		$ 0
Operating Lease, Liability, Noncurrent	66		$ 0
Operating Lease, Liability, Current	$ 18
Maximum Remaining Operating Lease Term	22 years
Variable Lease, Cost	$ 2
Short-term Lease, Cost	1
Lease, Cost	9
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 6
Operating Lease, Weighted Average Remaining Lease Term	6 years
Operating Lease, Weighted Average Discount Rate, Percent	4.00%
Operating Lease Extension Term	20 years

Leases Schedule of Maturities o

Leases Schedule of Maturities of Operating Lease Liabilities Under Non-Cancellable Leases (Details) $ in Millions	Mar. 31, 2019USD ($)
Schedule of Maturities of Operating Lease Liabilities Under Non-Cancellable Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 16
Lessee, Operating Lease, Liability, Payments, Due Year Two	22
Lessee, Operating Lease, Liability, Payments, Due Year Three	20
Lessee, Operating Lease, Liability, Payments, Due Year Four	15
Lessee, Operating Lease, Liability, Payments, Due Year Five	9
Lessee, Operating Lease, Liability, Payments, Due after Year Five	11
Lessee, Operating Lease, Liability, Payments, Due	93
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	9
Operating Lease, Liability	$ 84

Leases Schedule of Future Minim

Leases Schedule of Future Minimum Rental Payments Under Operating Leases (Details) $ in Millions	Dec. 31, 2018USD ($)
Schedule of Future Minimum Rental Payments Under Operating Leases [Abstract]
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year	$ 22
Operating Leases, Future Minimum Payments, Due in Two Years	18
Operating Leases, Future Minimum Payments, Due in Three Years	14
Operating Leases, Future Minimum Payments, Due in Four Years	9
Operating Leases, Future Minimum Payments, Due in Five Years	5
Operating Leases, Future Minimum Payments, Due Thereafter	7
Operating Leases, Future Minimum Payments Due	$ 75

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 18, 2019	Dec. 31, 2018
Facility [Line Items]
Fair value adjustments related to interest rate swap fair value hedges	$ 20		$ 21
Unamortized issuance costs	(30)		(30)
Unamortized discount	(9)		(10)
Total debt	5,361		5,307
Current debt	1,125		525
Long-term debt	4,236		4,782
Credit Agreement
Facility [Line Items]
Credit Facility	$ 80		351
Weighted-average variable interest rate	3.901%
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,400
Accounts Receivable Securitization Facility
Facility [Line Items]
Accounts Receivable Securitization Agreement	$ 200		200
Weighted-average variable interest rate	3.303%
Line of Credit Facility, Maximum Borrowing Capacity	$ 200
Accounts Recievable included in the Securitization Transaction	$ 766
Senior Notes | Issued November 2012, interest at 2.500% payable semi-annually, due December 2017
Facility [Line Items]
Debt interest rate percentage	2.50%
Senior Notes | Senior Notes Issued February 2009, interest at 9.750% payable semiannually, due March 2019
Facility [Line Items]
Debt interest rate percentage	9.75%
Senior Notes | Issued March 2014, interest at 2.700% payable semi-annually, due April 2019
Facility [Line Items]
Senior Notes	$ 325		325
Debt interest rate percentage	2.70%
Senior Notes | Issued March 2010, interest at 5.350% payable semiannually, due March 2020
Facility [Line Items]
Senior Notes	$ 600		600
Debt interest rate percentage	5.35%
Senior Notes | Issued September 2011, interest at 4.750% payable semiannually, due September 2021
Facility [Line Items]
Senior Notes	$ 500		500
Debt interest rate percentage	4.75%
Senior Notes | Issued March 2012, interest at 4.950% payable semi-annually, due April 2022
Facility [Line Items]
Senior Notes	$ 350		350
Debt interest rate percentage	4.95%
Senior Notes | Issued March 2013, interest at 3.875% payable semi-annually, due March 2023
Facility [Line Items]
Senior Notes	$ 500		500
Debt interest rate percentage	3.875%
Senior Notes | Issued July 2018 and January 2019, interest at 5.375% payable semi-annually, due July 2025
Facility [Line Items]
Senior Notes	$ 825	$ 325	500
Debt interest rate percentage	5.375%
Senior Notes | Issued August 2000, interest at 8.125% payable semi-annually, due August 2030
Facility [Line Items]
Senior Notes	$ 300		300
Debt interest rate percentage	8.125%
Senior Notes | Issued October 2006, interest at 6.450% payable semi-annually, due November 2036
Facility [Line Items]
Senior Notes	$ 300		300
Debt interest rate percentage	6.45%
Senior Notes | Issued September 2007, interest at 6.750% payable semi-annually, due September 2037
Facility [Line Items]
Senior Notes	$ 450		450
Debt interest rate percentage	6.75%
Senior Notes | Issued March 2014, interest at 5.600% payable semi-annually, due April 2044
Facility [Line Items]
Senior Notes	$ 400		400
Debt interest rate percentage	5.60%
Junior subordinated notes | Issued May 2013, interest at 5.850% payable semi-annually, due May 2043
Facility [Line Items]
Senior Notes	$ 550		$ 550
Debt interest rate percentage	5.85%

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jan. 18, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Line of Credit Facility, Borrowing Capacity, Description	$ 500
Interest deferment period	5 years
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Accounts Recievable included in the Securitization Transaction	$ 766
Line of Credit Facility, Maximum Borrowing Capacity	200
Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,400
Basis spread determined by credit rating	0.45%
Commitment fee percentage	0.30%
Unused capacity under the credit agreement	$ 1,307
Letter of credit amount outstanding	13
Debt covenants, maximum borrowing amount	$ 1,307
Credit Agreement | LIBOR
Debt Instrument [Line Items]
Variable rate basis spread	1.45%
Credit Agreement | Federal Funds Rate
Debt Instrument [Line Items]
Variable rate basis spread	0.50%
Credit Agreement | LIBOR Market Index
Debt Instrument [Line Items]
Variable rate basis spread	1.00%
Credit Agreement | Maximum
Debt Instrument [Line Items]
Maximum leverage ratio in event of acquisition	5.50
Credit Agreement | Quarters After June 30, 2018 | Maximum
Debt Instrument [Line Items]
Maximum leverage ratio	5
Issued July 2018 and January 2019, interest at 5.375% payable semi-annually, due July 2025 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 825	$ 325	$ 500
Proceeds from Issuance of Senior Long-term Debt	$ 324
Debt Instrument, Interest Rate, Stated Percentage	5.375%
Senior Notes Issued February 2009, interest at 9.750% payable semiannually, due March 2019 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.75%

Debt - Future Maturities of Lon

Debt - Future Maturities of Long-Term Debt (Detail) $ in Millions	Mar. 31, 2019USD ($)
Maturities of Long-term Debt [Abstract]
2019	$ 525
2020	600
2021	500
2022	430
2023	500
Thereafter	2,825
Long Term Debt Maturities Repayments Of Principal Total	$ 5,380

Risk Management and Hedging A_3

Risk Management and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Accumulated other comprehensive loss	$ (8)	$ (8)
Collateral, cash deposits	64
Letters of credit received	59
Accumulated Net Gain (Loss) from Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive loss	(8)	(8)	$ (9)	$ (9)
Accumulated Net Gain (Loss) from Cash Flow Hedges | Commodity derivatives
Derivative [Line Items]
Accumulated other comprehensive loss	$ (6)	$ (6)	$ (6)	$ (6)

Risk Management and Hedging A_4

Risk Management and Hedging Activities - Summary of Gross and Net Amounts of Derivative Instruments (Detail) - Commodity derivatives - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Gross Amounts of Assets Presented in the Balance Sheet	$ 37	$ 116
Amounts Not Offset in the Balance Sheet - Financial Instruments	0	0
Net Amount	37	116
Offsetting Liabilities [Line Items]
Gross Amounts of Liabilities Presented in the Balance Sheet	(66)	(99)
Amounts Not Offset in the Balance Sheet - Financial Instruments	0	0
Net Amount	$ (66)	$ (99)

Risk Management and Hedging A_5

Risk Management and Hedging Activities - Schedule of Designated and Non-Designated Derivative Instruments in Statement of Financial Position, Fair Value (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative Asset [Abstract]
Derivative Instruments and Hedges, Current Assets	$ 35	$ 108
Derivative Instruments and Hedges, Assets, Noncurrent	2	8
Derivative Liability [Abstract]
Derivative Instruments and Hedges, Current Liabilities	61	91
Derivative Instruments and Hedges, Liabilities, Noncurrent	5	8
Commodity derivatives | Derivative Asset Not Designated As Hedging Instruments [Member]
Derivative Asset [Abstract]
Derivative Instruments and Hedges, Current Assets	35	108
Derivative Instruments and Hedges, Assets, Noncurrent	2	8
Derivative Instruments Not Designated as Hedging Instruments, Total Assets, at Fair Value	37	116
Commodity derivatives | Derivative Liabilities Not Designated As Hedging Instruments [Member]
Derivative Liability [Abstract]
Derivative Instruments and Hedges, Current Liabilities	61	91
Derivative Instruments and Hedges, Liabilities, Noncurrent	5	8
Derivative Instruments Not Designated as Hedging Instruments, Total Liabilities, at Fair Value	$ 66	$ 99

Risk Management and Hedging A_6

Risk Management and Hedging Activities - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Accumulated Other Comprehensive (Loss) Income	$ (8)	$ (8)
Accumulated Net Gain (Loss) from Cash Flow Hedges
Derivative [Line Items]
Accumulated Other Comprehensive (Loss) Income	(8)	(8)	$ (9)	$ (9)
Accumulated Net Gain (Loss) from Cash Flow Hedges | Interest Rate Derivatives
Derivative [Line Items]
Accumulated Other Comprehensive (Loss) Income	(3)	(3)	(4)	(4)
Accumulated Net Gain (Loss) from Cash Flow Hedges | Commodity derivatives
Derivative [Line Items]
Accumulated Other Comprehensive (Loss) Income	(6)	(6)	(6)	(6)
Accumulated Net Gain (Loss) from Cash Flow Hedges | Foreign Currency Derivatives
Derivative [Line Items]
Accumulated Other Comprehensive (Loss) Income	1	$ 1	$ 1	$ 1
Cash Flow Hedging [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(1)
Cash Flow Hedging [Member] | Interest Rate Derivatives
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(1)
Cash Flow Hedging [Member] | Commodity derivatives
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	0
Cash Flow Hedging [Member] | Foreign Currency Derivatives
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 0

Risk Management and Hedging A_7

Risk Management and Hedging Activities - Schedule of Changes in Derivative Instruments not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Trading and marketing gains, net	$ (27)	$ (41)
Derivative Assets Not Designated As Hedging Instruments | Third Party | Commodity derivatives
Derivative [Line Items]
Realized gains (losses)	27	(12)
Unrealized losses	(54)	(29)
Trading and marketing gains, net	$ (27)	$ (41)

Risk Management and Hedging A_8

Risk Management and Hedging Activities - Schedule of Net Long or Short Positions Expected to be Realized (Detail)	3 Months Ended
	Mar. 31, 2019MMBTUbbl	Mar. 31, 2018MMBTUbbl
Crude Oil
Net (Short) Position, Volume [Abstract]
Net (Short) Position (Bbls), Year One | bbl	(1,191,000)	(2,511,000)
Net (Short) Position (Bbls), Year Two | bbl	(283,000)	(650,000)
Net (Short) Long Position (Bbls), Year Three | bbl	(100,000)	0
Net (Short) Position (Bbls), Year Four | bbl	0
Natural Gas
Net Long (Short) Position, MMBtu [Abstract]
Net (Short) Long Position (MMBtu), Year One | MMBTU	(32,148,650)	(20,737,300)
Net Long Position (MMBtu), Year Two | MMBTU	(930,000)	0
Net (Short) Long Position (MMBtu), Year Three | MMBTU	0	0
Net Long (Short) Position (MMBtu), Year Four | MMBTU	0
Natural Gas Liquids
Net (Short) Position, Volume [Abstract]
Net (Short) Position (Bbls), Year One | bbl	(26,987,090)	(24,473,245)
Net (Short) Position (Bbls), Year Two | bbl	(14,388,830)	(3,240,167)
Net (Short) Long Position (Bbls), Year Three | bbl	(5,516,168)	231,548
Net (Short) Position (Bbls), Year Four | bbl	(175)
Natural Gas Basis Swaps
Net Long (Short) Position, MMBtu [Abstract]
Net (Short) Long Position (MMBtu), Year One | MMBTU	2,102,500	(3,850,000)
Net Long Position (MMBtu), Year Two | MMBTU	3,660,000	2,402,500
Net (Short) Long Position (MMBtu), Year Three | MMBTU	(3,650,000)	3,660,000
Net Long (Short) Position (MMBtu), Year Four | MMBTU	0

Partnership Equity and Distri_3

Partnership Equity and Distributions - Additional Information (Detail) $ in Millions	Mar. 31, 2019USD ($)
Equity Distribution Agreement [Member]
Partnership Equity And Distribution [Line Items]
Offer Value Of Common Stock Unit Remaining Available For Sale	$ 750

Partnership Equity and Distri_4

Partnership Equity and Distributions - Cash Distribution (Detail) - USD ($) $ / shares in Units, $ in Millions	Mar. 15, 2019	Feb. 14, 2019	Jan. 15, 2019	Dec. 17, 2018	Nov. 14, 2018	Sep. 17, 2018	Aug. 14, 2018	Jun. 15, 2018	May 15, 2018	Feb. 14, 2018	Mar. 31, 2019	Mar. 31, 2018
Distribution Made to Limited Partner [Line Items]
Total Cash Distribution											$ 159	$ 194
Series A Preferred Limited Partners [Member]
Distribution Made to Limited Partner [Line Items]
Preferred Limited Partnership Distribution; Distribution Amount Paid				$ 36.8750				$ 41.9965
Total Cash Distribution				$ 18				$ 21			0	0
Series B Preferred Limited Partners [Member]
Distribution Made to Limited Partner [Line Items]
Preferred Limited Partnership Distribution; Distribution Amount Paid	$ 0.4922		$ 0.5576	$ 0.4922		$ 0.6781
Total Cash Distribution	$ 3		$ 2	$ 3		$ 4					3
Limited Partners
Distribution Made to Limited Partner [Line Items]
Per Unit Distribution (in dollars per share)		$ 0.7800			$ 0.7800		$ 0.7800		$ 0.7800	$ 0.7800
Total Cash Distribution		$ 154			$ 155		$ 154		$ 155	$ 194	$ 111	$ 111

Commitments and Contingent Li_2

Commitments and Contingent Liabilities Commitments and Contingent Liabilities (Details) - USD ($)	Feb. 14, 2019	Mar. 31, 2019
New Mexico Environment Department Notice of Violation 1 [Member]
Other Commitments [Line Items]
Administrative Settlement Penalty	$ 149,832
New Mexico Environment Department Notice of Violation 2 [Member]
Other Commitments [Line Items]
Administrative Settlement Penalty	$ 142,233
Low end of estimate
Other Commitments [Line Items]
Estimated Litigation Liability		$ 375,000
High end of estimate
Other Commitments [Line Items]
Estimated Litigation Liability		$ 420,000

Business Segments - Segment Inf

Business Segments - Segment Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)Segment	Mar. 31, 2018USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment	2
Segment Reporting Information [Line Items]
Total operating revenues	$ 2,199	$ 2,139
Gross margin	395	370
Operating and maintenance expense	(178)	(162)
Depreciation and amortization expense	(103)	(94)
General and administrative expense	(67)	(59)
Other income (expense)	(5)	(2)
Loss on sale of assets, net	(9)	0
Earnings from unconsolidated affiliates	113	78
Interest expense, net	(69)	(67)
Income tax expense	(1)	(1)
Net income	76	63
Net income attributable to noncontrolling interests	(1)	(1)
Net income attributable to partners	75	62
Non-cash derivative mark-to-market	(54)	(29)
Non-cash lower of cost or market adjustment	(5)	0
Capital expenditures	182	124
Investments in unconsolidated affiliates, net	131	60
Logistics and Marketing
Segment Reporting Information [Line Items]
Total operating revenues	2,045	1,979
Gathering and Processing
Segment Reporting Information [Line Items]
Total operating revenues	1,288	1,286
Operating Segments | Logistics and Marketing
Segment Reporting Information [Line Items]
Total operating revenues	2,045	1,979
Gross margin	58	18
Operating and maintenance expense	(9)	(11)
Depreciation and amortization expense	(3)	(3)
General and administrative expense	(3)	(3)
Other income (expense)	0	1
Loss on sale of assets, net	(9)
Earnings from unconsolidated affiliates	113	77
Interest expense, net	0	0
Income tax expense	0	0
Net income	147	79
Net income attributable to noncontrolling interests	0	0
Net income attributable to partners	147	79
Non-cash derivative mark-to-market	(18)	(43)
Non-cash lower of cost or market adjustment	(5)
Capital expenditures	14	1
Investments in unconsolidated affiliates, net	131	59
Operating Segments | Gathering and Processing
Segment Reporting Information [Line Items]
Total operating revenues	1,288	1,286
Gross margin	337	352
Operating and maintenance expense	(165)	(148)
Depreciation and amortization expense	(93)	(84)
General and administrative expense	(6)	(4)
Other income (expense)	(5)	(3)
Loss on sale of assets, net	0
Earnings from unconsolidated affiliates	0	1
Interest expense, net	0	0
Income tax expense	0	0
Net income	68	114
Net income attributable to noncontrolling interests	(1)	(1)
Net income attributable to partners	67	113
Non-cash derivative mark-to-market	(36)	14
Non-cash lower of cost or market adjustment	0
Capital expenditures	165	120
Investments in unconsolidated affiliates, net	0	1
Other
Segment Reporting Information [Line Items]
Total operating revenues	0	0
Gross margin	0	0
Operating and maintenance expense	(4)	(3)
Depreciation and amortization expense	(7)	(7)
General and administrative expense	(58)	(52)
Other income (expense)	0	0
Loss on sale of assets, net	0
Earnings from unconsolidated affiliates	0	0
Interest expense, net	(69)	(67)
Income tax expense	(1)	(1)
Net income	(139)	(130)
Net income attributable to noncontrolling interests	0	0
Net income attributable to partners	(139)	(130)
Non-cash derivative mark-to-market	0	0
Non-cash lower of cost or market adjustment	0
Capital expenditures	3	3
Investments in unconsolidated affiliates, net	0	0
Eliminations
Segment Reporting Information [Line Items]
Total operating revenues	(1,134)	(1,126)
Gross margin	0	0
Operating and maintenance expense		0
Depreciation and amortization expense	0	0
General and administrative expense	0	0
Other income (expense)		0
Loss on sale of assets, net	0
Earnings from unconsolidated affiliates	0	0
Interest expense, net	0	0
Income tax expense	0	0
Net income	0	0
Net income attributable to noncontrolling interests	0	0
Net income attributable to partners	0	0
Non-cash derivative mark-to-market		0
Non-cash lower of cost or market adjustment	0
Capital expenditures	0	0
Investments in unconsolidated affiliates, net	$ 0	$ 0

Business Segments - Segment Ass

Business Segments - Segment Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	$ 13,105	$ 12,995
Current assets	1,082	1,271
Total assets	14,187	14,266
Operating Segments | Logistics and Marketing
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	3,692	3,661
Operating Segments | Gathering and Processing
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	9,126	9,058
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	$ 287	$ 276

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of amounts capitalized	$ 65	$ 84
Noncash Investing and Financing Items [Abstract]
Property, plant and equipment acquired with accounts payable and accrued liabilities	40	$ 54
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 84		$ 0

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019
Parent Guarantor
Condensed Financial Statements, Captions [Line Items]
Ownership interest percentage in subsidiary	100.00%

Condensed Consolidating Finan_4

Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 1	$ 1	$ 2	$ 156
Accounts receivable, net	914	1,033
Inventories	52	79
Other	115	158
Total current assets	1,082	1,271
Property, plant and equipment, net	9,110	9,135
Goodwill and intangible assets, net	271	328
Advances receivable — consolidated subsidiaries	0	0
Investments in unconsolidated affiliates	0	0
Investments in unconsolidated affiliates	3,460	3,340
Other long-term assets	264	192
Total assets	14,187	14,266
LIABILITIES AND EQUITY
Accounts payable and other current liabilities	1,279	1,379
Current debt	1,125	525
Advances payable — consolidated subsidiaries	0	0
Long-term debt	4,236	4,782
Other long-term liabilities	334	283
Total liabilities	6,974	6,969
Commitments and contingent liabilities (see note 18)
Equity:
Net equity	7,192	7,276
Accumulated other comprehensive loss	(8)	(8)
Total partners’ equity	7,184	7,268
Noncontrolling interests	29	29
Total equity	7,213	7,297	7,312	7,438
Total liabilities and equity	14,187	14,266
Reportable Legal Entities | Parent Guarantor
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories	0	0
Other	0	0
Total current assets	0	0
Property, plant and equipment, net	0	0
Goodwill and intangible assets, net	0	0
Advances receivable — consolidated subsidiaries	2,293	2,452
Investments in unconsolidated affiliates	4,893	4,818
Investments in unconsolidated affiliates	0	0
Other long-term assets	0	0
Total assets	7,186	7,270
LIABILITIES AND EQUITY
Accounts payable and other current liabilities	2	2
Current debt	0	0
Advances payable — consolidated subsidiaries	0	0
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	2	2
Commitments and contingent liabilities (see note 18)
Equity:
Net equity	7,184	7,268
Accumulated other comprehensive loss	0	0
Total partners’ equity	7,184	7,268
Noncontrolling interests	0	0
Total equity	7,184	7,268
Total liabilities and equity	7,186	7,270
Reportable Legal Entities | Subsidiary Issuer
ASSETS
Cash and cash equivalents	0	0	0	155
Accounts receivable, net	0	0
Inventories	0	0
Other	0	0
Total current assets	0	0
Property, plant and equipment, net	0	0
Goodwill and intangible assets, net	0	0
Advances receivable — consolidated subsidiaries	1,870	1,883
Investments in unconsolidated affiliates	8,255	8,113
Investments in unconsolidated affiliates	0	0
Other long-term assets	0	0
Total assets	10,125	9,996
LIABILITIES AND EQUITY
Accounts payable and other current liabilities	71	71
Current debt	925	325
Advances payable — consolidated subsidiaries	0	0
Long-term debt	4,236	4,782
Other long-term liabilities	0	0
Total liabilities	5,232	5,178
Commitments and contingent liabilities (see note 18)
Equity:
Net equity	4,896	4,821
Accumulated other comprehensive loss	(3)	(3)
Total partners’ equity	4,893	4,818
Noncontrolling interests	0	0
Total equity	4,893	4,818
Total liabilities and equity	10,125	9,996
Reportable Legal Entities | Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	1	1	2	1
Accounts receivable, net	914	1,033
Inventories	52	79
Other	115	158
Total current assets	1,082	1,271
Property, plant and equipment, net	9,110	9,135
Goodwill and intangible assets, net	271	328
Advances receivable — consolidated subsidiaries	0	0
Investments in unconsolidated affiliates	0	0
Investments in unconsolidated affiliates	3,460	3,340
Other long-term assets	264	192
Total assets	14,187	14,266
LIABILITIES AND EQUITY
Accounts payable and other current liabilities	1,206	1,306
Current debt	200	200
Advances payable — consolidated subsidiaries	4,163	4,335
Long-term debt	0	0
Other long-term liabilities	334	283
Total liabilities	5,903	6,124
Commitments and contingent liabilities (see note 18)
Equity:
Net equity	8,260	8,118
Accumulated other comprehensive loss	(5)	(5)
Total partners’ equity	8,255	8,113
Noncontrolling interests	29	29
Total equity	8,284	8,142
Total liabilities and equity	14,187	14,266
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net	0	0
Inventories	0	0
Other	0	0
Total current assets	0	0
Property, plant and equipment, net	0	0
Goodwill and intangible assets, net	0	0
Advances receivable — consolidated subsidiaries	(4,163)	(4,335)
Investments in unconsolidated affiliates	(13,148)	(12,931)
Investments in unconsolidated affiliates	0	0
Other long-term assets	0	0
Total assets	(17,311)	(17,266)
LIABILITIES AND EQUITY
Accounts payable and other current liabilities	0	0
Current debt	0	0
Advances payable — consolidated subsidiaries	(4,163)	(4,335)
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	(4,163)	(4,335)
Commitments and contingent liabilities (see note 18)
Equity:
Net equity	(13,148)	(12,931)
Accumulated other comprehensive loss	0	0
Total partners’ equity	(13,148)	(12,931)
Noncontrolling interests	0	0
Total equity	(13,148)	(12,931)
Total liabilities and equity	$ (17,311)	$ (17,266)

Condensed Consolidating Finan_5

Condensed Consolidating Financial Information - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating revenues:
Sales of natural gas, NGLs and condensate	$ 115	$ 111
Trading and marketing losses, net	(27)	(41)
Total operating revenues	2,199	2,139
Purchases and related costs	1,804	1,769
Operating and maintenance expense	178	162
Depreciation and amortization expense	103	94
General and administrative expense	67	59
Loss on sale of assets, net	(9)	0
Other income (expense)	(5)	(2)
Costs and Expenses	2,166	2,086
Operating income	33	53
Interest expense, net	(69)	(67)
Income from consolidated subsidiaries	0	0
Earnings from unconsolidated affiliates	113	78
Income before income taxes	77	64
Income tax expense	(1)	(1)
Net income	76	63
Net income attributable to noncontrolling interests	(1)	(1)
Net income attributable to partners	75	62
Reportable Legal Entities | Parent Guarantor
Operating revenues:
Trading and marketing losses, net	0	0
Total operating revenues	0	0
Purchases and related costs	0	0
Operating and maintenance expense	0	0
Depreciation and amortization expense	0	0
General and administrative expense	0	0
Loss on sale of assets, net	0
Other income (expense)	0	0
Costs and Expenses	0	0
Operating income	0	0
Interest expense, net	0	0
Income from consolidated subsidiaries	75	62
Earnings from unconsolidated affiliates	0	0
Income before income taxes	75	62
Income tax expense	0	0
Net income	75	62
Net income attributable to noncontrolling interests	0	0
Net income attributable to partners	75	62
Reportable Legal Entities | Subsidiary Issuer
Operating revenues:
Trading and marketing losses, net	0	0
Total operating revenues	0	0
Purchases and related costs	0	0
Operating and maintenance expense	0	0
Depreciation and amortization expense	0	0
General and administrative expense	0	0
Loss on sale of assets, net	0
Other income (expense)	0	0
Costs and Expenses	0	0
Operating income	0	0
Interest expense, net	(67)	(67)
Income from consolidated subsidiaries	142	129
Earnings from unconsolidated affiliates	0	0
Income before income taxes	75	62
Income tax expense	0	0
Net income	75	62
Net income attributable to noncontrolling interests	0	0
Net income attributable to partners	75	62
Reportable Legal Entities | Non-Guarantor Subsidiaries
Operating revenues:
Trading and marketing losses, net	(27)	(41)
Total operating revenues	2,199	2,139
Purchases and related costs	1,804	1,769
Operating and maintenance expense	178	162
Depreciation and amortization expense	103	94
General and administrative expense	67	59
Loss on sale of assets, net	(9)
Other income (expense)	(5)	(2)
Costs and Expenses	2,166	2,086
Operating income	33	53
Interest expense, net	(2)	0
Income from consolidated subsidiaries	0	0
Earnings from unconsolidated affiliates	113	78
Income before income taxes	144	131
Income tax expense	(1)	(1)
Net income	143	130
Net income attributable to noncontrolling interests	(1)	(1)
Net income attributable to partners	142	129
Consolidating Adjustments
Operating revenues:
Trading and marketing losses, net	0	0
Total operating revenues	0	0
Purchases and related costs	0	0
Operating and maintenance expense	0	0
Depreciation and amortization expense	0	0
General and administrative expense	0	0
Loss on sale of assets, net	0
Other income (expense)	0	0
Costs and Expenses	0	0
Operating income	0	0
Interest expense, net	0	0
Income from consolidated subsidiaries	(217)	(191)
Earnings from unconsolidated affiliates	0	0
Income before income taxes	(217)	(191)
Income tax expense	0	0
Net income	(217)	(191)
Net income attributable to noncontrolling interests	0	0
Net income attributable to partners	(217)	(191)
Eliminations
Operating revenues:
Total operating revenues	(1,134)	(1,126)
Operating and maintenance expense		0
Depreciation and amortization expense	0	0
General and administrative expense	0	0
Loss on sale of assets, net	0
Other income (expense)		0
Interest expense, net	0	0
Earnings from unconsolidated affiliates	0	0
Income tax expense	0	0
Net income	0	0
Net income attributable to noncontrolling interests	0	0
Net income attributable to partners	0	0
Natural Gas, NGLs and Condensate [Member]
Operating revenues:
Sales of natural gas, NGLs and condensate	2,111	2,069
Natural Gas, NGLs and Condensate [Member] | Reportable Legal Entities | Parent Guarantor
Operating revenues:
Sales of natural gas, NGLs and condensate	0	0
Natural Gas, NGLs and Condensate [Member] | Reportable Legal Entities | Subsidiary Issuer
Operating revenues:
Sales of natural gas, NGLs and condensate	0	0
Natural Gas, NGLs and Condensate [Member] | Reportable Legal Entities | Non-Guarantor Subsidiaries
Operating revenues:
Sales of natural gas, NGLs and condensate	2,111	2,069
Natural Gas, NGLs and Condensate [Member] | Consolidating Adjustments
Operating revenues:
Sales of natural gas, NGLs and condensate	0	0
Transportation, Processing and Other [Member]
Operating revenues:
Sales of natural gas, NGLs and condensate	115	111
Transportation, Processing and Other [Member] | Reportable Legal Entities | Parent Guarantor
Operating revenues:
Sales of natural gas, NGLs and condensate	0	0
Transportation, Processing and Other [Member] | Reportable Legal Entities | Subsidiary Issuer
Operating revenues:
Sales of natural gas, NGLs and condensate	0	0
Transportation, Processing and Other [Member] | Reportable Legal Entities | Non-Guarantor Subsidiaries
Operating revenues:
Sales of natural gas, NGLs and condensate	115	111
Transportation, Processing and Other [Member] | Consolidating Adjustments
Operating revenues:
Sales of natural gas, NGLs and condensate	$ 0	$ 0

Condensed Consolidating Finan_6

Condensed Consolidating Financial Information - Condensed Consolidating Statement of Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net income	$ 76	$ 63
Other comprehensive income (loss):
Total other comprehensive income	0	0
Total comprehensive income	76	63
Total comprehensive income attributable to noncontrolling interests	(1)	(1)
Total comprehensive income attributable to partners	75	62
Reportable Legal Entities | Parent Guarantor
Condensed Financial Statements, Captions [Line Items]
Net income	75	62
Other comprehensive income (loss):
Total other comprehensive income	0	0
Total comprehensive income	75	62
Total comprehensive income attributable to noncontrolling interests	0	0
Total comprehensive income attributable to partners	75	62
Reportable Legal Entities | Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net income	75	62
Other comprehensive income (loss):
Total other comprehensive income	0	0
Total comprehensive income	75	62
Total comprehensive income attributable to noncontrolling interests	0	0
Total comprehensive income attributable to partners	75	62
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	143	130
Other comprehensive income (loss):
Total other comprehensive income	0	0
Total comprehensive income	143	130
Total comprehensive income attributable to noncontrolling interests	(1)	(1)
Total comprehensive income attributable to partners	142	129
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(217)	(191)
Other comprehensive income (loss):
Total other comprehensive income	0	0
Total comprehensive income	(217)	(191)
Total comprehensive income attributable to noncontrolling interests	0	0
Total comprehensive income attributable to partners	$ (217)	$ (191)

Condensed Consolidating Finan_7

Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities	$ 317	$ 122
INVESTING ACTIVITIES:
Intercompany transfers	0	0
Capital expenditures	(182)	(124)
Investments in unconsolidated affiliates, net	(131)	(60)
Proceeds from sale of assets	103	3
Net cash used in investing activities	(210)	(181)
FINANCING ACTIVITIES:
Intercompany transfers	0	0
Proceeds from debt	1,402	635
Payments of debt	(1,348)	(535)
Distributions to preferred limited partners	(5)	0
Distributions to limited partners and general partner	(154)	(194)
Distributions to noncontrolling interests	(1)	(1)
Other	(1)	0
Net cash used in financing activities	(107)	(95)
Net change in cash and cash equivalents	0	(154)
Cash and cash equivalents, beginning of period	1	156
Cash and cash equivalents, end of period	1	2
Reportable Legal Entities | Parent Guarantor
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities	0	0
INVESTING ACTIVITIES:
Intercompany transfers	159	194
Capital expenditures	0	0
Investments in unconsolidated affiliates, net	0	0
Proceeds from sale of assets	0	0
Net cash used in investing activities	159	194
FINANCING ACTIVITIES:
Intercompany transfers	0	0
Proceeds from debt	0	0
Payments of debt	0	0
Distributions to preferred limited partners	(5)
Distributions to limited partners and general partner	(154)	(194)
Distributions to noncontrolling interests	0	0
Other	0
Net cash used in financing activities	(159)	(194)
Net change in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Reportable Legal Entities | Subsidiary Issuer
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities	(66)	(84)
INVESTING ACTIVITIES:
Intercompany transfers	13	(171)
Capital expenditures	0	0
Investments in unconsolidated affiliates, net	0	0
Proceeds from sale of assets	0	0
Net cash used in investing activities	13	(171)
FINANCING ACTIVITIES:
Intercompany transfers	0	0
Proceeds from debt	1,402	635
Payments of debt	(1,348)	(535)
Distributions to preferred limited partners	0
Distributions to limited partners and general partner	0	0
Distributions to noncontrolling interests	0	0
Other	(1)
Net cash used in financing activities	53	100
Net change in cash and cash equivalents	0	(155)
Cash and cash equivalents, beginning of period	0	155
Cash and cash equivalents, end of period	0	0
Reportable Legal Entities | Non-Guarantor Subsidiaries
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities	383	206
INVESTING ACTIVITIES:
Intercompany transfers	0	0
Capital expenditures	(182)	(124)
Investments in unconsolidated affiliates, net	(131)	(60)
Proceeds from sale of assets	103	3
Net cash used in investing activities	(210)	(181)
FINANCING ACTIVITIES:
Intercompany transfers	(172)	(23)
Proceeds from debt	0	0
Payments of debt	0	0
Distributions to preferred limited partners	0
Distributions to limited partners and general partner	0	0
Distributions to noncontrolling interests	(1)	(1)
Other	0
Net cash used in financing activities	(173)	(24)
Net change in cash and cash equivalents	0	1
Cash and cash equivalents, beginning of period	1	1
Cash and cash equivalents, end of period	1	2
Consolidating Adjustments
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities	0	0
INVESTING ACTIVITIES:
Intercompany transfers	(172)	(23)
Capital expenditures	0	0
Investments in unconsolidated affiliates, net	0	0
Proceeds from sale of assets	0	0
Net cash used in investing activities	(172)	(23)
FINANCING ACTIVITIES:
Intercompany transfers	172	23
Proceeds from debt	0	0
Payments of debt	0	0
Distributions to preferred limited partners	0
Distributions to limited partners and general partner	0	0
Distributions to noncontrolling interests	0	0
Other	0
Net cash used in financing activities	172	23
Net change in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$ 0	$ 0

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - $ / shares	Jul. 15, 2019	Jul. 01, 2019	Jun. 17, 2019	Jun. 03, 2019	May 03, 2019	Apr. 23, 2019	Mar. 15, 2019	Jan. 15, 2019	Dec. 17, 2018	Sep. 17, 2018	Jun. 15, 2018
Series B Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partnership Unit; Distribution Amount Declared							$ 0.4922	$ 0.5576	$ 0.4922	$ 0.6781
Series A Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partnership Unit; Distribution Amount Declared									$ 36.8750		$ 41.9965
Subsequent Event [Member]
Subsequent Event [Line Items]
Distribution Made to Common Unitholders, Declaration Date						Apr. 23, 2019
Distribution Made to Limited Partner, Distributions Declared, Per Unit						$ 0.78
Distribution Made to Limited Partner, Distribution Date			May 15, 2019
Distribution Made to Limited Partner, Date of Record					May 3, 2019
Subsequent Event [Member] | Series B Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partnership Distribution: Declaration Date						Apr. 23, 2019
Preferred Limited Partnership Unit; Distribution Amount Declared						$ 0.4922
Preferred Limited Partnership Distribution; Distribution Date			Jun. 17, 2019
Preferred Limited Partner Distribution: Record Date				Jun. 3, 2019
Subsequent Event [Member] | Series C Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partnership Distribution: Declaration Date						Apr. 23, 2019
Preferred Limited Partnership Unit; Distribution Amount Declared						$ 0.4969
Preferred Limited Partnership Distribution; Distribution Date	Jul. 15, 2019
Preferred Limited Partner Distribution: Record Date		Jul. 1, 2019
Subsequent Event [Member] | Series A Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partnership Distribution: Declaration Date						Apr. 23, 2019
Preferred Limited Partnership Unit; Distribution Amount Declared						$ 36.8750
Preferred Limited Partnership Distribution; Distribution Date			Jun. 17, 2019
Preferred Limited Partner Distribution: Record Date				Jun. 3, 2019