DCP Midstream (DCP-PC) 10-Q 3 Aug 23 2023 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2023	Jul. 28, 2023
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-32678
Entity Registrant Name	DCP MIDSTREAM, LP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	03-0567133
Entity Address, Address Line One	6900 E. Layton Ave
Entity Address, Address Line Two	Suite 900
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80237
City Area Code	(303)
Local Phone Number	595-3331
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001338065
Entity Common Stock, Shares Outstanding		208,677,458
Document Period End Date	true
Document Period End Date	Jun. 30, 2023
Series C Preferred Limited Partners [Member]
Title of 12(b) Security	7.95% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	DCP PRC
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 5	$ 1
Accounts receivable:
Trade, net of allowance for credit losses of $3 and $2 million, respectively	438	995
Other	2	3
Inventories	41	83
Unrealized gains on derivative instruments	60	140
Collateral cash deposits	3	93
Other	28	27
Total current assets	1,002	1,702
Property, plant and equipment, net	7,733	7,763
Intangible assets, net	32	34
Investments in unconsolidated affiliates	3,416	3,475
Unrealized gains on derivative instruments	17	26
Operating lease assets	109	112
Other long-term assets	183	222
Total assets	12,492	13,334
Accounts payable:
Trade	517	1,199
Other	30	29
Current debt	7	506
Unrealized losses on derivative instruments	36	148
Accrued interest	71	78
Accrued taxes	51	58
Accrued wages and benefits	32	72
Capital spending accrual	8	22
Other	139	137
Total current liabilities	1,144	2,504
Long-term debt	4,901	4,357
Unrealized losses on derivative instruments	13	35
Deferred income taxes	33	33
Operating lease liabilities	97	95
Other long-term liabilities	221	274
Total liabilities	6,509	7,298
Equity:
Limited partners (208,677,458 and 208,396,558 common units authorized, issued and outstanding, respectively)	5,859	5,755
Accumulated other comprehensive loss	(6)	(6)
Total partners’ equity	5,959	6,011
Noncontrolling interests	24	25
Total equity	5,983	6,036
Total liabilities and equity	12,492	13,334
Allowance for Doubtful Accounts Receivable, Current	$ 3	$ 2
Common unitholders, units issued (in shares)	208,677,458	208,396,558
Common unitholders, units outstanding (in shares)	208,677,458	208,396,558
Related Party
Accounts receivable:
Affiiates	$ 425	$ 360
Accounts payable:
Trade	253	255
Phillips 66 | Related Party
Accounts receivable:
Affiiates	398	343
Other	7	1
Accounts payable:
Trade	163	167
Accrued wages and benefits	32	0
Other	28	0
Long-term debt	100	0
Series B Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	0	156
Total equity	$ 0	$ 156
Preferred Units, Issued	0	6,450,000
Preferred Units, Outstanding	0	6,450,000
Series C Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	$ 106	$ 106
Total equity	$ 106	$ 106
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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating revenues:
Trading and marketing gains (losses), net	$ 20	$ (14)	$ 107	$ (249)
Total operating revenues	1,841	4,269	4,567	7,644
Operating costs and expenses:
Operating and maintenance expense	229	189	426	341
Depreciation and amortization expense	91	90	181	180
General and administrative expense	68	65	148	120
Other income, net	0	(8)	0	(8)
Asset Impairment	0	1	0	1
Loss (gain) on sale of assets, net	3	0	3	(7)
Restructuring costs	16	0	26	0
Total operating costs and expenses	1,819	3,981	4,424	7,346
Operating income	22	288	143	298
Earnings from unconsolidated affiliates	148	168	308	311
Interest expense, net	(75)	(70)	(143)	(141)
Income before income taxes	95	386	308	468
Income tax expense	0	(2)	(1)	(3)
Net income	95	384	307	465
Net income attributable to noncontrolling interests	(1)	(1)	(2)	(2)
Net income attributable to partners	94	383	305	463
Series A preferred limited partners' interest in net income	0	(9)	0	(18)
Series B preferred limited partners' interest in net income	(3)	(3)	(6)	(6)
Series C preferred limited partners' interest in net income	(2)	(3)	(4)	(5)
Net income allocable to limited partners	$ 84	$ 368	$ 290	$ 434
Net income per limited partner unit — basic and diluted	$ 0.40	$ 1.77	$ 1.39	$ 2.08
Weighted Average Limited Partnership Units Outstanding, Basic	208.7	208.4	208.6	208.4
Weighted Average Limited Partnership Units Outstanding, Diluted	208.7	208.5	208.6	208.6
Preferred Stock Redemption Premium	$ (5)	$ 0	$ (5)	$ 0
Series A Preferred Limited Partners [Member]
Operating costs and expenses:
Net income		9
Limited Partners
Operating costs and expenses:
Net income	89	368
Preferred Stock Redemption Premium	(5)
Natural Gas, NGLs and Condensate [Member] | Third Party
Operating revenues:
Sales of natural gas, NGLs and condensate	762	2,880	2,505	5,208
Operating costs and expenses:
Purchases and related costs	1,112	3,269	2,964	5,988
Transportation, Processing and Other [Member]
Operating revenues:
Sales of natural gas, NGLs and condensate	148	184	311	339
Affiliated Entity | Natural Gas, NGLs and Condensate [Member]
Operating revenues:
Sales of natural gas, NGLs and condensate	911	1,219	1,644	2,346
Operating costs and expenses:
Purchases and related costs	12	100	109	199
Affiliated Entity | Transportation Fees
Operating costs and expenses:
Purchases and related costs	$ 288	$ 275	$ 567	$ 532

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ 95	$ 384	$ 307	$ 465
Other comprehensive income:
Other comprehensive income	0	0	0	0
Total comprehensive income	95	384	307	465
Total comprehensive income attributable to noncontrolling interests	(1)	(1)	(2)	(2)
Total comprehensive income attributable to partners	$ 94	$ 383	$ 305	$ 463

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
OPERATING ACTIVITIES:
Net (loss) income	$ 95	$ 384	$ 307	$ 465
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	91	90	181	180
Earnings from unconsolidated affiliates	(148)	(168)	(308)	(311)
Distributions from unconsolidated affiliates			360	369
Net unrealized (gains) losses on derivative instruments	(7)	(101)	(47)	75
Loss (gain) on sale of assets, net	3	0	3	(7)
Asset Impairment	0	1	0	1
Other, net			39	14
Change in operating assets and liabilities, which (used) provided cash, net of effects of acquisitions:
Accounts receivable			492	(624)
Inventories			20	(31)
Accounts payable			(693)	606
Decrease in Other Operating Assets and Liabilities, Net			15	(163)
Net cash provided by operating activities			369	574
INVESTING ACTIVITIES:
Capital expenditures	(82)	(37)	(163)	(60)
Business Combination, Consideration Transferred			0	(16)
Payments to Acquire Equity Method Investments			(1)	(1)
Proceeds from Equity Method Investment, Distribution, Return of Capital			9	0
Proceeds from sale of assets			4	16
Net cash used in investing activities			(151)	(61)
FINANCING ACTIVITIES:
Proceeds from debt			2,576	2,690
Payments of debt			(2,441)	(2,998)
Distributions to preferred limited partners			(10)	(29)
Distributions to limited partners and general partner			(179)	(163)
Payments to Noncontrolling Interests			(3)	(2)
Payments for Repurchase of Redeemable Preferred Stock	(161)		(161)	0
Payments of Debt Issuance Costs			0	(4)
Net cash provided by (used in) financing activities			(218)	(506)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect			0	7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance			5	1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	5	$ 8	5	$ 8
Cash and cash equivalents, end of period	$ 5		$ 5

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]	Limited Partners	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests
Beginning balance at Dec. 31, 2021	$ 5,876	$ 489	$ 156	$ 106	$ 5,106	$ (6)	$ 25
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	81	9	3	2	66	0	1
Total Cash Distribution to Unitholders	(86)	0	(3)	(2)	(81)	0	0
Distributions to noncontrolling interests	(1)	0	0	0	0	0	(1)
Employee Benefits and Share-based Compensation	1	0	0	0	1	0	0
Ending balance at Mar. 31, 2022	5,871	498	156	106	5,092	(6)	25
Beginning balance at Dec. 31, 2021	5,876	489	156	106	5,106	(6)	25
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	465
Payments for Repurchase of Redeemable Preferred Stock	0
Preferred Stock Redemption Premium	0
Ending balance at Jun. 30, 2022	6,150	489	156	106	5,380	(6)	25
Beginning balance at Mar. 31, 2022	5,871	498	156	106	5,092	(6)	25
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	384	9	3	3	368	0	(1)
Preferred Stock Redemption Premium	0
Total Cash Distribution to Unitholders	(106)	(18)	(3)	(3)	(82)	0	0
Distributions to noncontrolling interests	(1)	0	0	0	0	0	(1)
Employee Benefits and Share-based Compensation	2	0	0	0	2	0	0
Ending balance at Jun. 30, 2022	6,150	$ 489	156	106	5,380	(6)	25
Beginning balance at Dec. 31, 2022	6,036		156	106	5,755	(6)	25
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	212		3	2	206	0	1
Total Cash Distribution to Unitholders	(95)		(3)	(2)	(90)	0	0
Distributions to noncontrolling interests	(2)		0	0	0	0	(2)
Employee Benefits and Share-based Compensation	(3)		0	0	(3)	0	0
Ending balance at Mar. 31, 2023	6,148		156	106	5,868	(6)	24
Beginning balance at Dec. 31, 2022	6,036		156	106	5,755	(6)	25
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	307
Payments for Repurchase of Redeemable Preferred Stock	(161)
Preferred Stock Redemption Premium	(5)
Ending balance at Jun. 30, 2023	5,983		0	106	5,859	(6)	24
Beginning balance at Mar. 31, 2023	6,148		156	106	5,868	(6)	24
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	95		3	2	89	0	1
Payments for Repurchase of Redeemable Preferred Stock	(161)
Redemption of Series B preferred limited partners' units carrying value			(156)
Preferred Stock Redemption Premium	(5)				(5)
Total Cash Distribution to Unitholders	(94)		(3)	(2)	(89)	0	0
Distributions to noncontrolling interests	(1)		0	0	0	0	(1)
Employee Benefits and Share-based Compensation	(4)		0	0	(4)	0	0
Ending balance at Jun. 30, 2023	$ 5,983		$ 0	$ 106	$ 5,859	$ (6)	$ 24

Description of Business and Bas

Description of Business and Basis of Presentation (Notes)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	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 15 "Business Segments" in the Notes to the Condensed Consolidated Financial Statements in Item 1. "Financial Statements". Our operations and activities are managed by our general partner, DCP Midstream GP, LP (“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. Phillips 66 has the authority to conduct, direct and manage the activities of DCP Midstream, LLC associated with the Partnership and our general partner, and, therefore, effectively controls our business and affairs. On January 5, 2023, the Partnership, GP LP, the General Partner, Phillips 66, Phillips 66 Project Development Inc., a Delaware corporation and indirect wholly owned subsidiary of Phillips 66 (“PDI”), and Dynamo Merger Sub LLC, a Delaware limited liability company and wholly owned subsidiary of PDI (“Merger Sub”), entered into an Agreement and Plan of Merger (the "Merger Agreement"), pursuant to which Merger Sub merged with and into the Partnership, with the Partnership surviving as a Delaware limited partnership (the “Merger”). The Merger was completed on June 15, 2023 in accordance with the terms of the Merger Agreement. Under the terms of the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each common unit representing a limited partner interest in the Partnership (each, a “Common Unit”) issued and outstanding as of immediately prior to the Effective Time (other than the Sponsor Owned Units, as defined below) (each, a “Public Common Unit”) was converted into the right to receive $41.75 per Public Common Unit in cash, without any interest thereon (the “Merger Consideration”). The Common Units owned by DCP Midstream, LLC and the General Partner (collectively, the “Sponsor Owned Units”) were unaffected by the Merger and remained outstanding immediately following the Merger as Common Units of the Partnership. Following the Merger, the Common Units were delisted from the New York Stock Exchange (“NYSE”) and a Form 15 has been filed to deregister the Common Units under the Securities Exchange Act of 1934, as amended. As a result of the Merger, Phillips 66’s economic interest in the Partnership increased from 43.3% to approximately 86.8%. Enbridge's economic interest in the Partnership was unchanged, and remains at approximately 13.2%. 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 GAAP. All intercompany balances and transactions have been eliminated in consolidation.

Revenue Recognition (Notes)

Revenue Recognition (Notes)	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from External Customers by Products and Services [Table Text Block]	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 June 30, 2023 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 418 $ 343 $ (321) $ 440 Sales of NGLs and condensate (a) 1,106 778 (651) 1,233 Transportation, processing and other 18 130 — 148 Trading and marketing gains (losses), net (b) 19 1 — 20 Total operating revenues $ 1,561 $ 1,252 $ (972) $ 1,841 Six Months Ended June 30, 2023 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 1,220 $ 1,023 $ (990) $ 1,253 Sales of NGLs and condensate (a) 2,634 1,676 (1,414) 2,896 Transportation, processing and other 37 274 — 311 Trading and marketing gains, net (b) 62 45 — 107 Total operating revenues $ 3,953 $ 3,018 $ (2,404) $ 4,567 (a) Includes $444 million and $923 million for the three and six months ended June 30, 2023, respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our Logistics and Marketing segment. For the three and six months ended June 30, 2023, these revenues are net of $868 million and $1,593 million, respectively, of buy-sell purchases related to buy-sell revenues of $954 million and $1,751 million, respectively, which are not within the scope of Topic 606. (b) Not within the scope of Topic 606. Three Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 1,436 $ 1,238 $ (1,169) $ 1,505 Sales of NGLs and condensate (a) 2,333 1,579 (1,318) 2,594 Transportation, processing and other 18 166 — 184 Trading and marketing gains (losses), net (b) 2 (16) — (14) Total operating revenues $ 3,789 $ 2,967 $ (2,487) $ 4,269 Six Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 2,499 $ 2,120 $ (1,990) $ 2,629 Sales of NGLs and condensate (a) 4,455 2,861 (2,391) 4,925 Transportation, processing and other 37 302 — 339 Trading and marketing losses, net (b) (39) (210) — (249) Total operating revenues $ 6,952 $ 5,073 $ (4,381) $ 7,644 (a) Includes $708 million and $1,384 million for the three and six months ended June 30, 2022, respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our Logistics and Marketing segment. For the three and six months ended June 30, 2022, these revenues are net of $1,005 million and $1,761 million, respectively, of buy-sell purchases related to buy-sell revenues of $1,089 million and $1,940 million, respectively, which are not within the scope of 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 $349 million as of June 30, 2023. Our remaining performance obligations primarily consist of minimum volume commitment fee arrangements and are expected to be recognized through 2031 with a weighted average remaining life of three years as of June 30, 2023. As a practical expedient permitted by Topic 606, this amount excludes variable consideration as well as remaining performance obligations that have original expected durations of one year or less, as applicable. Our remaining performance obligations also exclude estimates of variable rate escalation clauses in our contracts with customers.

Agreements and Transactions wit

Agreements and Transactions with Affiliates (Notes)	6 Months Ended
	Jun. 30, 2023
Related Party Transactions [Abstract]
Agreements and Transactions with Affiliates	Agreements and Transactions with Affiliates Phillips 66 Intercompany Credit Agreement We entered into an Intercompany Credit Agreement with Phillips 66 on June 15, 2023. For more information regarding the terms and conditions of the Intercompany Credit Agreement, see Note 8 "Debt" in the Notes to the Condensed Consolidated Financial Statements in Item 1. "Financial Statements". DCP Midstream, LLC Services Agreement and Other General and Administrative Charges 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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) Employee related costs charged by DCP Midstream, LLC Operating and maintenance expense $ 46 $ 42 $ 89 $ 82 General and administrative expense $ 29 $ 42 $ 87 $ 75 Restructuring costs $ 16 $ — $ 26 $ — Summary of Transactions with Affiliates The following table summarizes our transactions with affiliates: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) Phillips 66 (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ 896 $ 1,197 1197 $ 1,600 $ 2,292 Purchases and related costs from affiliates $ 2 $ 65 $ 77 $ 127 Transportation and related costs from affiliates $ 46 $ 47 $ 87 $ 90 Operating and maintenance and general administrative expenses $ 6 $ 4 $ 10 $ 7 Enbridge (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ 1 $ (2) $ 2 $ (2) Purchases and related costs from affiliates $ — $ — $ — $ 13 Transportation and related costs from affiliates $ 1 $ 1 $ 1 $ 1 Operating and maintenance and general administrative expenses $ 1 $ — $ 1 $ — Unconsolidated affiliates: Sales of natural gas, NGLs and condensate to affiliates $ 14 $ 24 $ 42 $ 56 Transportation, processing, and other to affiliates $ 4 $ 3 $ 8 $ 7 Purchases and related costs from affiliates $ 10 $ 35 $ 32 $ 59 Transportation and related costs from affiliates $ 241 $ 227 $ 479 $ 441 We had balances with affiliates as follows: June 30, 2023 December 31, 2022 (millions) Phillips 66 (including its affiliates): Accounts receivable $ 398 $ 343 Other assets $ 7 $ 1 Accounts payable $ 163 $ 167 Accrued wages and benefits $ 32 $ — Other liabilities $ 28 $ — Long-term debt $ 100 $ — Enbridge (including its affiliates): Accounts receivable $ — $ 1 Accounts payable $ — $ 1 Unconsolidated affiliates: Accounts receivable $ 27 $ 16 Accounts payable $ 90 $ 87

Inventories (Notes)

Inventories (Notes)	6 Months Ended
	Jun. 30, 2023
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories were as follows: June 30, 2023 December 31, 2022 (millions) Natural gas $ 20 $ 47 NGLs 21 36 Total inventories $ 41 $ 83

Property, Plant and Equipment (

Property, Plant and Equipment (Notes)	6 Months Ended
	Jun. 30, 2023
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 June 30, 2023 December 31, 2022 (millions) Gathering and transmission systems 20 — 50 Years $ 7,955 $ 7,865 Processing, storage and terminal facilities 35 — 60 Years 5,175 5,138 Other 3 — 30 Years 545 563 Finance lease assets 5 — 35 Years 32 32 Construction work in progress 196 183 Property, plant and equipment 13,903 13,781 Accumulated depreciation (6,170) (6,018) Property, plant and equipment, net $ 7,733 $ 7,763 Construction projects with capitalized interest were immaterial during the six months ended June 30, 2023 and 2022. Depreciation expense was $90 million and $88 million for the three months ended June 30, 2023 and 2022, respectively, and $179 million and $177 million for the six months ended June 30, 2023 and 2022, respectively.

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates (Notes)	6 Months Ended
	Jun. 30, 2023
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 June 30, 2023 December 31, 2022 (millions) DCP Sand Hills Pipeline, LLC 66.67% $ 1,637 $ 1,653 DCP Southern Hills Pipeline, LLC 66.67% 705 713 Gulf Coast Express LLC 25.00% 392 408 Front Range Pipeline LLC 33.33% 187 191 Texas Express Pipeline LLC 10.00% 88 91 Mont Belvieu 1 Fractionator 20.00% 9 7 Discovery Producer Services LLC 40.00% 208 219 Cheyenne Connector, LLC 50.00% 141 143 Mont Belvieu Enterprise Fractionator 12.50% 28 28 Other Various 21 22 Total investments in unconsolidated affiliates $ 3,416 $ 3,475 Earnings from investments in unconsolidated affiliates were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) DCP Sand Hills Pipeline, LLC $ 78 $ 104 $ 165 $ 175 DCP Southern Hills Pipeline, LLC 27 21 52 45 Gulf Coast Express LLC 18 16 35 32 Front Range Pipeline LLC 11 11 22 21 Texas Express Pipeline LLC 5 5 10 10 Mont Belvieu 1 Fractionator 4 3 8 7 Discovery Producer Services LLC 1 3 7 9 Cheyenne Connector, LLC 3 3 6 7 Mont Belvieu Enterprise Fractionator 1 2 2 4 Other — — 1 1 Total earnings from unconsolidated affiliates $ 148 $ 168 $ 308 $ 311 The following tables summarize the combined financial information of our investments in unconsolidated affiliates: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) (millions) Statements of operations: Operating revenue $ 541 $ 626 $ 1,136 $ 1,189 Operating expenses $ 214 $ 246 $ 436 $ 463 Net income $ 328 $ 380 $ 707 $ 724

Fair Value Measurement (Notes)

Fair Value Measurement (Notes)	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Derivatives and Fair Value	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. The following table presents the financial instruments carried at fair value on a recurring basis as of June 30, 2023 and December 31, 2022, by condensed consolidated balance sheet caption and by valuation hierarchy, as described above: June 30, 2023 December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (millions) Current assets: Commodity derivatives $ 1 $ 49 $ 10 $ 60 $ 2 $ 121 $ 17 $ 140 Short-term investments (a) $ — $ — $ — $ — $ — $ 1 $ — $ 1 Long-term assets: Commodity derivatives $ — $ 16 $ 1 $ 17 $ — $ 23 $ 3 $ 26 Investments in marketable securities (a) $ — $ — $ — $ — $ 42 $ — $ — $ 42 Current liabilities: Commodity derivatives $ (1) $ (31) $ (4) $ (36) $ (4) $ (142) $ (2) $ (148) Long-term liabilities: Commodity derivatives $ — $ (12) $ (1) $ (13) $ — $ (32) $ (3) $ (35) (a) zero and $1 million recorded within "Other" current assets and zero and $42 million recorded within "Other long-term assets" as of June 30, 2023 and December 31, 2022, respectively. Changes in Level 3 Fair Value Measurements The table below illustrates a rollforward of the amounts included in our condensed consolidated balance sheets for derivative financial instruments that we have classified within Level 3. 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 June 30, 2023 (a): Beginning balance $ 15 $ 1 $ (1) $ (1) Net unrealized gains (losses) included in earnings 6 — (6) (1) Transfers out of Level 3 (9) (1) 4 1 Settlements (2) 1 (1) — Ending balance $ 10 $ 1 $ (4) $ (1) Net unrealized gains (losses) on derivatives still held included in earnings $ 4 $ — $ (3) $ — Three months ended June 30, 2022 (a): Beginning balance $ 2 $ 4 $ (10) $ (5) Net unrealized gains included in earnings 3 2 5 — Transfers out of Level 3 (1) — 2 1 Settlements (1) — — — Ending balance $ 3 $ 6 $ (3) $ (4) Net unrealized gains (losses) on derivatives still held included in earnings $ 3 $ 3 $ 5 $ (6) Commodity Derivative Instruments Current Long-Term Current Long-Term (millions) Six months ended June 30, 2023 (a): Beginning balance $ 17 $ 3 $ (2) $ (3) Net unrealized gains (losses) included in earnings 5 — (2) 1 Transfers out of Level 3 (8) (2) 1 1 Settlements (4) — (1) — Ending balance $ 10 $ 1 $ (4) $ (1) Net unrealized gains (losses) on derivatives still held included in earnings $ 6 $ 1 $ (3) $ (1) Six months ended June 30, 2022 (a): Beginning balance $ — $ 2 $ (3) $ (4) Net unrealized gains (losses) included in earnings 3 6 (6) (6) Transfers out of Level 3 — (2) 4 6 Settlements — — 2 — Ending balance $ 3 $ 6 $ (3) $ (4) Net unrealized gains (losses) on derivatives still held included in earnings $ 3 $ 4 $ (2) $ (3) (a) There were no purchases, issuances or sales of derivatives or transfers into Level 3 for the three and six months ended June 30, 2023 and 2022. 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. June 30, 2023 Product Group Fair Value Valuation Techniques Unobservable Input Forward Weighted Average (a) (millions) Assets NGLs $ 10 Market approach Longer dated forward curve prices $0.24-$1.29 $0.68 Per gallon Natural gas $ 1 Market approach Longer dated forward curve prices $2.73-$4.71 $1.96 Per MMBtu Liabilities NGLs $ (4) Market approach Longer dated forward curve prices $0.24-$1.33 $0.81 Per gallon Natural gas $ (1) Market approach Longer dated forward curve prices $2.73-$4.71 $3.16 Per MMBtu (a) Unobservable inputs were weighted by the instrument's notional amounts. Nonfinancial Assets and Liabilities We utilize fair value to perform impairment tests as required on our long-lived assets and equity investments in unconsolidated affiliates. 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. During the three and six months ended June 30, 2023, we recognized a $10 million impairment associated with an office lease that we vacated and partially sublet as part of our integration with Phillips 66 during the three months ended June 30, 2023. This impairment is recorded within restructuring costs in our condensed consolidated statements of operations and other, net within our condensed consolidated statements of cash flows. Estimated Fair Value of Financial Instruments 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 based on quotes obtained from bond dealers. The carrying value of borrowings under the Credit Agreement and the Securitization Facility approximate 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 June 30, 2023 and December 31, 2022, the carrying value and fair value of our total debt, including current maturities, were as follows: June 30, 2023 December 31, 2022 Carrying Value (a) Fair Value Carrying Value (a) Fair Value (millions) Total debt $ 5,013 $ 4,976 $ 4,874 $ 4,772 (a) Excludes unamortized issuance costs and finance lease liabilities.

Debt (Notes)

Debt (Notes)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Debt	Debt Junior Notes Redemption On May 19, 2023, we redeemed, at par, prior to maturity all $550 million of aggregate principal amount outstanding of our 5.850% Junior Notes due May 2043, using borrowings under our Credit Facility and Securitization Facility. Senior Notes Redemption On March 15, 2023, we repaid, at par, all $500 million of aggregate principal amount outstanding of our 3.875% Senior Notes due March 15, 2023, using borrowings under our Credit Facility and Securitization Facility. Intercompany Credit Agreement On June 15, 2023, we and our wholly owned subsidiary, DCP Midstream Operating, LP, entered into a new five-year revolving Intercompany Credit Agreement with Phillips 66, as lender. The Intercompany Credit Agreement provides up to $1 billion of borrowing capacity, with an option to increase the commitment by an aggregate principal amount of up to $500 million, subject to lender approval. At our election, the Intercompany Credit Agreement bears interest at either the adjusted term SOFR rate or the base rate plus, in each case, an applicable margin based on our credit rating. A ratings-based pricing grid determines our cost of borrowing under the Intercompany Credit Agreement. Indebtedness under the Intercompany Credit Agreement bears interest at either: (1) SOFR, plus an applicable margin of 1.075% based on our current credit rating, plus an adjustment of 0.10%; or (2) (a) the base rate, which shall be the higher of the prime rate, the Federal Funds rate plus 0.50% or the SOFR Market Index rate plus 1.00%, plus (b) an applicable margin of 0.075% based on our current credit rating. Based on our current credit rating, the Intercompany Credit Agreement incurs an annual facility fee of 0.175%. As of June 30, 2023, we had unused borrowing capacity of $900 million, net of $100 million of outstanding borrowings, under the Intercompany Credit Agreement, of which $900 million would have been available to borrow for working capital and other general partnership purposes based on the financial covenants set forth in the Intercompany Credit Agreement. Except in the case of a default, amounts borrowed under our Intercompany Credit Agreement will not become due prior to the June 15, 2028 maturity date. Credit Agreement We are party to a $1.4 billion unsecured revolving Credit Facility governed by the Credit Agreement that bears interest at either the term SOFR rate or the base rate plus, in each case, an applicable margin based on our credit rating. The Credit Agreement matures on March 18, 2027. The Credit Agreement also includes sustainability linked key performance indicators that increase or decrease the applicable margin and facility fee payable thereunder based on our safety performance relative to our peers and year-over-year change in our greenhouse gas emissions intensity rate. As of June 30, 2023, we had unused borrowing capacity of $548 million, net of $850 million of outstanding borrowings and $2 million of letters of credit, under the Credit Agreement, of which $548 million would have been available to borrow for working capital and other general partnership purposes based on the financial covenants set forth in the Credit Agreement. Except in the case of a default, amounts borrowed under our Credit Agreement will not become due prior to the March 18, 2027 maturity date. Accounts Receivable Securitization Facility The Securitization Facility provides for up to $350 million of borrowing capacity through August 2024 at an adjusted SOFR rate and includes an uncommitted option to increase the total commitments under the Securitization Facility by up to an additional $400 million. 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, a bankruptcy-remote special purpose entity created for the sole purpose of the Securitization Facility. As of June 30, 2023, DCP Receivables had approximately $785 million of our accounts receivable securing borrowings of $280 million under the Securitization Facility. The maturities of our debt as of June 30, 2023 are as follows: Debt (millions) 2023 $ — 2024 280 2025 825 2026 — 2027 1,350 Thereafter 2,550 Total debt $ 5,005

Risk Management and Hedging Act

Risk Management and Hedging Activities (Notes)	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Risk Management and Hedging Activities	Risk Management and Hedging ActivitiesOur 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 June 30, 2023, we had cash deposits of $3 million, included in collateral cash deposits in our condensed consolidated balance sheets. Additionally, as of June 30, 2023, we held letters of credit of $23 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. Offsetting Certain of our financial 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: June 30, 2023 December 31, 2022 Gross Amounts Amounts Not Net Gross Amounts Amounts Not Net (millions) Assets: Commodity derivatives $ 77 $ (8) $ 69 $ 166 $ — $ 166 Liabilities: Commodity derivatives $ (49) $ 8 $ (41) $ (183) $ — $ (183) 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 June 30, 2023 and December 31, 2022. Balance Sheet Line Item June 30, December 31, Balance Sheet Line Item June 30, 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 $ 60 $ 140 Unrealized losses on derivative instruments — current $ (36) $ (148) Unrealized gains on derivative instruments — long-term 17 26 Unrealized losses on derivative instruments — long-term (13) (35) Total $ 77 $ 166 Total $ (49) $ (183) For the six months ended June 30, 2023 and 2022, 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. 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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) (millions) Realized gains (losses) $ 13 $ (115) $ 60 $ (174) Unrealized gains (losses) 7 101 47 (75) Trading and marketing gains (losses), net $ 20 $ (14) $ 107 $ (249) We do not have any derivative financial instruments that are designated 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. June 30, 2023 Crude Oil Natural Gas Natural Gas Natural Gas Year of Expiration Net Short Net Short Position Net Short Net Long (Short) Position 2023 — (16,830,500) (2,750,000) 1,280,000 2024 — (15,966,800) — (235,000) 2025 — (4,140,000) — 2,985,000 2026 — — — 535,000 June 30, 2022 Crude Oil Natural Gas Natural Gas Natural Gas Year of Expiration Net Short Net Short Position Net Short Net (Short) Long 2022 (849,000) (42,566,900) (5,347,476) (2,915,000) 2023 (1,526,000) (26,655,000) (4,281,200) (16,572,500) 2024 (720,000) (8,235,000) (1,337,000) (5,940,000) 2025 — (7,300,000) (1,441,000) (980,000) 2026 — — (1,440,000) 535,000 2027 — — (600,000) —

Partnership Equity and Distribu

Partnership Equity and Distributions (Notes)	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Partnership Equity and Distributions	Partnership Equity and Distributions Common Units — Following the completion of the Merger on June 15, 2023, all of the Common Units of the Partnership are owned by DCP Midstream, LLC, DCP Midstream GP, LP and Phillips 66 Project Development Inc., an indirect wholly owned subsidiary of Phillips 66. Former holders of Public Common Units ceased to have any rights as holders of Common Units at the Effective Time, other than the right to receive the Merger Consideration in accordance with the Merger Agreement. The Common Units were delisted from the NYSE and we filed to suspend our reporting obligations with respect to the Common Units under Sections 13 and 15(d) of the Securities Exchange Act of 1934, as amended. Preferred Units — On June 15, 2023 we paid $161 million to redeem in full the outstanding Series B Preferred Units at a redemption price of $25 per unit using cash on hand and borrowings under our Securitization Facility. The difference between the redemption price of the Series B Preferred Units and the carrying value on the balance sheet resulted in an approximately $5 million reduction to net income allocable to limited partners. The carrying value represented the original issuance proceeds, net of underwriting fees and offering costs for the Series B Preferred Units. Following the redemption, the Series B Preferred Units were delisted from the NYSE and we filed to suspend our reporting obligations with respect to the Series B Preferred Units under Sections 13 and 15(d) of the Securities Exchange Act of 1934, as amended. Distributions — The following table presents our cash distributions paid in 2023: Payment Date Per Unit Total Cash (millions) Distributions to common unitholders May 15, 2023 $ 0.43 $ 89 February 14, 2023 $ 0.43 $ 90 Distributions to Series B Preferred unitholders June 15, 2023 $ 0.4922 $ 3 March 15, 2023 $ 0.4922 $ 3 Distributions to Series C Preferred unitholders April 17, 2023 $ 0.4969 $ 2 January 17, 2023 $ 0.4969 $ 2

Equity-Based Compensation (Note

Equity-Based Compensation (Notes)	6 Months Ended
	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Equity-Based Compensation	Equity-Based CompensationAs of December 31, 2022, we had 327,190 Strategic Performance Units ("SPUs") and 532,432 Phantom Units outstanding. Pursuant to the terms of the Merger Agreement, the majority of these SPUs and Phantom Units were forfeited and as of June 30, 2023, there were an immaterial number of SPUs and Phantom Units outstanding.

Net Income or Loss per Limited

Net Income or Loss per Limited Partner Unit (Notes)	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Net Income or Loss per Limited Partner Unit	Net Income or Loss per Limited Partner Unit Prior to June 15, 2023, we had restricted phantom units outstanding, and we had the ability to elect to settle certain of the restricted phantom units in either cash or common units at our discretion. As of June 30, 2023, there were no outstanding equity classified restricted phantom units. Basic and diluted net income per limited partner unit was calculated as follows for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions, except per unit amounts) Net income allocable to limited partners $ 84 $ 368 $ 290 $ 434 Weighted average limited partner units outstanding, basic 208,662,361 208,379,466 208,609,415 208,381,451 Dilutive effects of nonvested restricted phantom units 8,327 142,150 24,353 235,749 Weighted average limited partner units outstanding, diluted 208,670,688 208,521,616 208,633,768 208,617,200 Net income per limited partner unit, basic and diluted $ 0.40 $ 1.77 $ 1.39 $ 2.08

Commitments and Contingent Liab

Commitments and Contingent Liabilities (Notes)	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities Litigation — We are not a party to any material 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. Environment, Health and Safety — 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 the environment, health and safety. 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 health and safety, public health and 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, health and safety standards applicable to workers and the public, 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 as well as general oil and gas production facilities and the real or perceived environmental or public health impacts of these activities, 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 agencies regarding the emission of greenhouse gases and other air emissions associated with our operations or the materials managed as part of our business, 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 as a party under federal, state, and local laws regulating the discharge of materials into the environment. We have elected to disclose matters where we reasonably believe such proceeding would result in monetary sanctions, exclusive of interest and costs, of $1 million or more. 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 on our results of operations, financial position, or cash flows: • In 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, which we had self-disclosed to CDPHE in December 2017. Following information exchanges and discussions with CDPHE, 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. A revised air permit was issued in May 2019, but the parties had not yet entered into a final settlement agreement to complete the matter. Subsequently, in July 2020 CDPHE issued a Notice of Violation in relation to amine treater emissions at this gas processing plant, which we had self-disclosed to CDPHE in April 2020. We are still exchanging information and holding discussions with CDPHE as to this and the foregoing flare-related enforcement matter, including possible settlement terms, although these matters, which have since been combined, may end up in formal legal proceedings. It is possible that resolution of this matter may include an administrative penalty and economic benefit payment, further revising the facility air permit, or installation of emissions management equipment, or a combination of these, that could, in the aggregate, exceed the disclosure threshold amount described above,

Restructuring (Notes)

Restructuring (Notes)	6 Months Ended
	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	Restructuring Costs We undertook restructuring actions, as well as other transformation and integration efforts, as part of our integration with Phillips 66. During the three and six months ended June 30, 2023, we incurred $16 million and $26 million, respectively, in impairment, severance and other employee related costs. The following table presents a rollforward of the Company's restructuring liability as of June 30, 2023, which is primarily included in Other current liabilities in the condensed consolidated balance sheets: (millions) Balance as of January 1, 2023 $ 15 Severance and employee related charges 16 Cash payments (30) Balance as of June 30, 2023 $ 1

Business Segments (Notes)

Business Segments (Notes)	6 Months Ended
	Jun. 30, 2023
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. Adjusted 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 the 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, 2022. Our Logistics and Marketing segment includes transporting, trading, marketing, storing natural gas and NGLs, and fractionating NGLs. 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 June 30, 2023 Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 1,561 $ 1,252 $ — $ (972) $ 1,841 Adjusted gross margin (a) $ 58 $ 371 $ — $ — $ 429 Operating and maintenance expense (8) (216) (5) — (229) General and administrative expense (1) (4) (63) — (68) Depreciation and amortization expense (4) (84) (3) — (91) Loss on sale of assets, net — (3) — — (3) Restructuring costs — — (16) — (16) Earnings from unconsolidated affiliates 147 1 — — 148 Interest expense — — (75) — (75) Net income (loss) $ 192 $ 65 $ (162) $ — $ 95 Net income attributable to noncontrolling interests — (1) — — (1) Net income (loss) attributable to partners $ 192 $ 64 $ (162) $ — $ 94 Non-cash derivative mark-to-market $ 17 $ (10) $ — $ — $ 7 Capital expenditures $ 1 $ 81 $ — $ — $ 82 Six Months Ended June 30, 2023: Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 3,953 $ 3,018 $ — $ (2,404) $ 4,567 Adjusted gross margin (a) $ 112 $ 815 $ — $ — $ 927 Operating and maintenance expense (17) (398) (11) — (426) General and administrative expense (3) (8) (137) — (148) Depreciation and amortization expense (6) (168) (7) — (181) Loss on sale of assets, net — (3) — — (3) Restructuring costs — — (26) — (26) Earnings from unconsolidated affiliates 301 7 — — 308 Interest expense — — (143) — (143) Income tax expense — — (1) — (1) Net income (loss) $ 387 $ 245 $ (325) $ — $ 307 Net income attributable to noncontrolling interests — (2) — — (2) Net income (loss) attributable to partners $ 387 $ 243 $ (325) $ — $ 305 Non-cash derivative mark-to-market $ 12 $ 35 $ — $ — $ 47 Non-cash lower of cost or net realizable value adjustments $ 22 $ — $ — $ — $ 22 Capital expenditures $ 1 $ 160 $ 2 $ — $ 163 Three Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 3,789 $ 2,967 $ — $ (2,487) $ 4,269 Adjusted gross margin (a) $ 40 $ 585 $ — $ — $ 625 Operating and maintenance expense (9) (175) (5) — (189) General and administrative expense (2) (5) (58) — (65) Depreciation and amortization expense (3) (82) (5) — (90) Asset impairments — (1) — — (1) Other income (expense), net 10 (2) — — 8 Earnings from unconsolidated affiliates 165 3 — — 168 Interest expense — — (70) — (70) Income tax expense — — (2) — (2) Net income (loss) $ 201 $ 323 $ (140) $ — $ 384 Net income attributable to noncontrolling interests — (1) — — (1) Net income (loss) attributable to partners $ 201 $ 322 $ (140) $ — $ 383 Non-cash derivative mark-to-market $ 26 $ 75 $ — $ — $ 101 Capital expenditures $ 4 $ 31 $ 2 $ — $ 37 Investments in unconsolidated affiliates, net $ — $ — $ — $ — $ — Six Months Ended June 30, 2022: Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 6,952 $ 5,073 $ — $ (4,381) $ 7,644 Adjusted gross margin (a) $ 56 $ 869 $ — $ — $ 925 Operating and maintenance expense (17) (315) (9) — (341) General and administrative expense (3) (9) (108) — (120) Depreciation and amortization expense (6) (163) (11) — (180) Asset impairments — (1) — — (1) Other income (expense), net 10 (2) — — 8 Gain on sale of assets, net — 7 — — 7 Earnings from unconsolidated affiliates 302 9 — — 311 Interest expense — — (141) — (141) Income tax expense — — (3) — (3) Net income (loss) $ 342 $ 395 $ (272) $ — $ 465 Net income attributable to noncontrolling interests — (2) — — (2) Net income (loss) attributable to partners $ 342 $ 393 $ (272) $ — $ 463 Non-cash derivative mark-to-market $ (19) $ (56) $ — $ — $ (75) Capital expenditures $ 6 $ 51 $ 3 $ — $ 60 Investments in unconsolidated affiliates, net $ — $ 1 $ — $ — $ 1 June 30, December 31, 2023 2022 (millions) Segment long-term assets: Gathering and Processing $ 7,573 $ 7,594 Logistics and Marketing 3,754 3,814 Other (b) 163 224 Total long-term assets 11,490 11,632 Current assets 1,002 1,702 Total assets $ 12,492 $ 13,334 (a) Adjusted gross margin consists of total operating revenues, including commodity derivative activity, less purchases and related costs. Adjusted 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, adjusted gross margin should not be considered an alternative to, or more meaningful than, net income, net cash provided by operating activities or gross margin as determined in accordance with GAAP. Our adjusted gross margin may not be comparable to similarly titled measures of other companies because other entities may not calculate adjusted gross margin in the same manner.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information (Notes)	6 Months Ended
	Jun. 30, 2023
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Six Months Ended June 30, 2023 2022 (millions) Cash paid for interest: Cash paid for interest, net of amounts capitalized $ 145 $ 138 Cash paid for income taxes, net of income tax refunds $ 2 $ — Non-cash investing and financing activities: Property, plant and equipment acquired with accounts payable and accrued liabilities $ 24 $ 12 Other non-cash changes in property, plant and equipment $ — $ (2) Other non-cash activities: Right-of-use assets obtained in exchange for operating and finance lease liabilities $ 22 $ 14

Subsequent Events (Notes)

Subsequent Events (Notes)	6 Months Ended
	Jun. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Distributions — On July 14, 2023, we announced that the board of directors of the General Partner declared a quarterly distribution on our Common Units of $0.43 per Common Unit. The distribution will be paid on August 11, 2023 to unitholders of record on July 31, 2023. Also on July 14, 2023, the board of directors of the General Partner declared a quarterly distribution on our Series C Preferred Units of $0.4969 per unit. The Series C distribution will be paid on October 16, 2023 to unitholders of record on October 2, 2023.

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Description and Basis of Presentation [Text Block]	The condensed consolidated financial statements have been prepared in accordance with GAAP. All intercompany balances and transactions have been eliminated in consolidation.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	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 June 30, 2023 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 418 $ 343 $ (321) $ 440 Sales of NGLs and condensate (a) 1,106 778 (651) 1,233 Transportation, processing and other 18 130 — 148 Trading and marketing gains (losses), net (b) 19 1 — 20 Total operating revenues $ 1,561 $ 1,252 $ (972) $ 1,841 Six Months Ended June 30, 2023 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 1,220 $ 1,023 $ (990) $ 1,253 Sales of NGLs and condensate (a) 2,634 1,676 (1,414) 2,896 Transportation, processing and other 37 274 — 311 Trading and marketing gains, net (b) 62 45 — 107 Total operating revenues $ 3,953 $ 3,018 $ (2,404) $ 4,567 (a) Includes $444 million and $923 million for the three and six months ended June 30, 2023, respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our Logistics and Marketing segment. For the three and six months ended June 30, 2023, these revenues are net of $868 million and $1,593 million, respectively, of buy-sell purchases related to buy-sell revenues of $954 million and $1,751 million, respectively, which are not within the scope of Topic 606. (b) Not within the scope of Topic 606. Three Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 1,436 $ 1,238 $ (1,169) $ 1,505 Sales of NGLs and condensate (a) 2,333 1,579 (1,318) 2,594 Transportation, processing and other 18 166 — 184 Trading and marketing gains (losses), net (b) 2 (16) — (14) Total operating revenues $ 3,789 $ 2,967 $ (2,487) $ 4,269 Six Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 2,499 $ 2,120 $ (1,990) $ 2,629 Sales of NGLs and condensate (a) 4,455 2,861 (2,391) 4,925 Transportation, processing and other 37 302 — 339 Trading and marketing losses, net (b) (39) (210) — (249) Total operating revenues $ 6,952 $ 5,073 $ (4,381) $ 7,644 (a) Includes $708 million and $1,384 million for the three and six months ended June 30, 2022, respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our Logistics and Marketing segment. For the three and six months ended June 30, 2022, these revenues are net of $1,005 million and $1,761 million, respectively, of buy-sell purchases related to buy-sell revenues of $1,089 million and $1,940 million, respectively, which are not within the scope of 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 $349 million as of June 30, 2023. Our remaining performance obligations primarily consist of minimum volume commitment fee arrangements and are expected to be recognized through 2031 with a weighted average remaining life of three years as of June 30, 2023. As a practical expedient permitted by Topic 606, this amount excludes variable consideration as well as remaining performance obligations that have original expected durations of one year or less, as applicable. Our remaining performance obligations also exclude estimates of variable rate escalation clauses in our contracts with customers.
Revenue from External Customers by Products and Services [Table Text Block]	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 June 30, 2023 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 418 $ 343 $ (321) $ 440 Sales of NGLs and condensate (a) 1,106 778 (651) 1,233 Transportation, processing and other 18 130 — 148 Trading and marketing gains (losses), net (b) 19 1 — 20 Total operating revenues $ 1,561 $ 1,252 $ (972) $ 1,841 Six Months Ended June 30, 2023 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 1,220 $ 1,023 $ (990) $ 1,253 Sales of NGLs and condensate (a) 2,634 1,676 (1,414) 2,896 Transportation, processing and other 37 274 — 311 Trading and marketing gains, net (b) 62 45 — 107 Total operating revenues $ 3,953 $ 3,018 $ (2,404) $ 4,567 (a) Includes $444 million and $923 million for the three and six months ended June 30, 2023, respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our Logistics and Marketing segment. For the three and six months ended June 30, 2023, these revenues are net of $868 million and $1,593 million, respectively, of buy-sell purchases related to buy-sell revenues of $954 million and $1,751 million, respectively, which are not within the scope of Topic 606. (b) Not within the scope of Topic 606. Three Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 1,436 $ 1,238 $ (1,169) $ 1,505 Sales of NGLs and condensate (a) 2,333 1,579 (1,318) 2,594 Transportation, processing and other 18 166 — 184 Trading and marketing gains (losses), net (b) 2 (16) — (14) Total operating revenues $ 3,789 $ 2,967 $ (2,487) $ 4,269 Six Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Eliminations Total (millions) Sales of natural gas $ 2,499 $ 2,120 $ (1,990) $ 2,629 Sales of NGLs and condensate (a) 4,455 2,861 (2,391) 4,925 Transportation, processing and other 37 302 — 339 Trading and marketing losses, net (b) (39) (210) — (249) Total operating revenues $ 6,952 $ 5,073 $ (4,381) $ 7,644 (a) Includes $708 million and $1,384 million for the three and six months ended June 30, 2022, respectively, of revenues from physical sales contracts and buy-sell exchange transactions in our Logistics and Marketing segment. For the three and six months ended June 30, 2022, these revenues are net of $1,005 million and $1,761 million, respectively, of buy-sell purchases related to buy-sell revenues of $1,089 million and $1,940 million, respectively, which are not within the scope of 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 $349 million as of June 30, 2023. Our remaining performance obligations primarily consist of minimum volume commitment fee arrangements and are expected to be recognized through 2031 with a weighted average remaining life of three years as of June 30, 2023. As a practical expedient permitted by Topic 606, this amount excludes variable consideration as well as remaining performance obligations that have original expected durations of one year or less, as applicable. Our remaining performance obligations also exclude estimates of variable rate escalation clauses in our contracts with customers.

Agreements and Transactions w_2

Agreements and Transactions with Affiliates (Tables)	6 Months Ended
	Jun. 30, 2023
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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) Employee related costs charged by DCP Midstream, LLC Operating and maintenance expense $ 46 $ 42 $ 89 $ 82 General and administrative expense $ 29 $ 42 $ 87 $ 75 Restructuring costs $ 16 $ — $ 26 $ —
Summary of Transactions with Affiliates	The following table summarizes our transactions with affiliates: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) Phillips 66 (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ 896 $ 1,197 1197 $ 1,600 $ 2,292 Purchases and related costs from affiliates $ 2 $ 65 $ 77 $ 127 Transportation and related costs from affiliates $ 46 $ 47 $ 87 $ 90 Operating and maintenance and general administrative expenses $ 6 $ 4 $ 10 $ 7 Enbridge (including its affiliates): Sales of natural gas, NGLs and condensate to affiliates $ 1 $ (2) $ 2 $ (2) Purchases and related costs from affiliates $ — $ — $ — $ 13 Transportation and related costs from affiliates $ 1 $ 1 $ 1 $ 1 Operating and maintenance and general administrative expenses $ 1 $ — $ 1 $ — Unconsolidated affiliates: Sales of natural gas, NGLs and condensate to affiliates $ 14 $ 24 $ 42 $ 56 Transportation, processing, and other to affiliates $ 4 $ 3 $ 8 $ 7 Purchases and related costs from affiliates $ 10 $ 35 $ 32 $ 59 Transportation and related costs from affiliates $ 241 $ 227 $ 479 $ 441 We had balances with affiliates as follows: June 30, 2023 December 31, 2022 (millions) Phillips 66 (including its affiliates): Accounts receivable $ 398 $ 343 Other assets $ 7 $ 1 Accounts payable $ 163 $ 167 Accrued wages and benefits $ 32 $ — Other liabilities $ 28 $ — Long-term debt $ 100 $ — Enbridge (including its affiliates): Accounts receivable $ — $ 1 Accounts payable $ — $ 1 Unconsolidated affiliates: Accounts receivable $ 27 $ 16 Accounts payable $ 90 $ 87

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2023
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories were as follows: June 30, 2023 December 31, 2022 (millions) Natural gas $ 20 $ 47 NGLs 21 36 Total inventories $ 41 $ 83

Property, Plant and Equipment_2

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2023
Property, Plant and Equipment [Abstract]
Classification of Property, Plant and Equipment	A summary of property, plant and equipment by classification is as follows: Depreciable June 30, 2023 December 31, 2022 (millions) Gathering and transmission systems 20 — 50 Years $ 7,955 $ 7,865 Processing, storage and terminal facilities 35 — 60 Years 5,175 5,138 Other 3 — 30 Years 545 563 Finance lease assets 5 — 35 Years 32 32 Construction work in progress 196 183 Property, plant and equipment 13,903 13,781 Accumulated depreciation (6,170) (6,018) Property, plant and equipment, net $ 7,733 $ 7,763

Investments in Unconsolidated_2

Investments in Unconsolidated Affiliates (Tables)	6 Months Ended
	Jun. 30, 2023
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 June 30, 2023 December 31, 2022 (millions) DCP Sand Hills Pipeline, LLC 66.67% $ 1,637 $ 1,653 DCP Southern Hills Pipeline, LLC 66.67% 705 713 Gulf Coast Express LLC 25.00% 392 408 Front Range Pipeline LLC 33.33% 187 191 Texas Express Pipeline LLC 10.00% 88 91 Mont Belvieu 1 Fractionator 20.00% 9 7 Discovery Producer Services LLC 40.00% 208 219 Cheyenne Connector, LLC 50.00% 141 143 Mont Belvieu Enterprise Fractionator 12.50% 28 28 Other Various 21 22 Total investments in unconsolidated affiliates $ 3,416 $ 3,475
Schedule Of Earnings From Investment In Unconsolidated Affiliates [Table Text Block]	Earnings from investments in unconsolidated affiliates were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) DCP Sand Hills Pipeline, LLC $ 78 $ 104 $ 165 $ 175 DCP Southern Hills Pipeline, LLC 27 21 52 45 Gulf Coast Express LLC 18 16 35 32 Front Range Pipeline LLC 11 11 22 21 Texas Express Pipeline LLC 5 5 10 10 Mont Belvieu 1 Fractionator 4 3 8 7 Discovery Producer Services LLC 1 3 7 9 Cheyenne Connector, LLC 3 3 6 7 Mont Belvieu Enterprise Fractionator 1 2 2 4 Other — — 1 1 Total earnings from unconsolidated affiliates $ 148 $ 168 $ 308 $ 311
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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) (millions) Statements of operations: Operating revenue $ 541 $ 626 $ 1,136 $ 1,189 Operating expenses $ 214 $ 246 $ 436 $ 463 Net income $ 328 $ 380 $ 707 $ 724

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
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 June 30, 2023 (a): Beginning balance $ 15 $ 1 $ (1) $ (1) Net unrealized gains (losses) included in earnings 6 — (6) (1) Transfers out of Level 3 (9) (1) 4 1 Settlements (2) 1 (1) — Ending balance $ 10 $ 1 $ (4) $ (1) Net unrealized gains (losses) on derivatives still held included in earnings $ 4 $ — $ (3) $ — Three months ended June 30, 2022 (a): Beginning balance $ 2 $ 4 $ (10) $ (5) Net unrealized gains included in earnings 3 2 5 — Transfers out of Level 3 (1) — 2 1 Settlements (1) — — — Ending balance $ 3 $ 6 $ (3) $ (4) Net unrealized gains (losses) on derivatives still held included in earnings $ 3 $ 3 $ 5 $ (6) Commodity Derivative Instruments Current Long-Term Current Long-Term (millions) Six months ended June 30, 2023 (a): Beginning balance $ 17 $ 3 $ (2) $ (3) Net unrealized gains (losses) included in earnings 5 — (2) 1 Transfers out of Level 3 (8) (2) 1 1 Settlements (4) — (1) — Ending balance $ 10 $ 1 $ (4) $ (1) Net unrealized gains (losses) on derivatives still held included in earnings $ 6 $ 1 $ (3) $ (1) Six months ended June 30, 2022 (a): Beginning balance $ — $ 2 $ (3) $ (4) Net unrealized gains (losses) included in earnings 3 6 (6) (6) Transfers out of Level 3 — (2) 4 6 Settlements — — 2 — Ending balance $ 3 $ 6 $ (3) $ (4) Net unrealized gains (losses) on derivatives still held included in earnings $ 3 $ 4 $ (2) $ (3) (a) There were no purchases, issuances or sales of derivatives or transfers into Level 3 for the three and six months ended June 30, 2023 and 2022.
Schedule of Valuation Processes	June 30, 2023 Product Group Fair Value Valuation Techniques Unobservable Input Forward Weighted Average (a) (millions) Assets NGLs $ 10 Market approach Longer dated forward curve prices $0.24-$1.29 $0.68 Per gallon Natural gas $ 1 Market approach Longer dated forward curve prices $2.73-$4.71 $1.96 Per MMBtu Liabilities NGLs $ (4) Market approach Longer dated forward curve prices $0.24-$1.33 $0.81 Per gallon Natural gas $ (1) Market approach Longer dated forward curve prices $2.73-$4.71 $3.16 Per MMBtu
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]	June 30, 2023 and December 31, 2022, the carrying value and fair value of our total debt, including current maturities, were as follows: June 30, 2023 December 31, 2022 Carrying Value (a) Fair Value Carrying Value (a) Fair Value (millions) Total debt $ 5,013 $ 4,976 $ 4,874 $ 4,772
Financial Instruments Carried at Fair Value	June 30, 2023 December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (millions) Current assets: Commodity derivatives $ 1 $ 49 $ 10 $ 60 $ 2 $ 121 $ 17 $ 140 Short-term investments (a) $ — $ — $ — $ — $ — $ 1 $ — $ 1 Long-term assets: Commodity derivatives $ — $ 16 $ 1 $ 17 $ — $ 23 $ 3 $ 26 Investments in marketable securities (a) $ — $ — $ — $ — $ 42 $ — $ — $ 42 Current liabilities: Commodity derivatives $ (1) $ (31) $ (4) $ (36) $ (4) $ (142) $ (2) $ (148) Long-term liabilities: Commodity derivatives $ — $ (12) $ (1) $ (13) $ — $ (32) $ (3) $ (35)

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Future Maturities of Long-Term Debt	The maturities of our debt as of June 30, 2023 are as follows: Debt (millions) 2023 $ — 2024 280 2025 825 2026 — 2027 1,350 Thereafter 2,550 Total debt $ 5,005

Risk Management and Hedging A_2

Risk Management and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Gross and Net Amounts of Derivative Instruments	June 30, 2023 December 31, 2022 Gross Amounts Amounts Not Net Gross Amounts Amounts Not Net (millions) Assets: Commodity derivatives $ 77 $ (8) $ 69 $ 166 $ — $ 166 Liabilities: Commodity derivatives $ (49) $ 8 $ (41) $ (183) $ — $ (183)
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 June 30, 2023 and December 31, 2022. Balance Sheet Line Item June 30, December 31, Balance Sheet Line Item June 30, 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 $ 60 $ 140 Unrealized losses on derivative instruments — current $ (36) $ (148) Unrealized gains on derivative instruments — long-term 17 26 Unrealized losses on derivative instruments — long-term (13) (35) Total $ 77 $ 166 Total $ (49) $ (183)
Schedule of Changes in Derivative Instruments Not Designated as Hedging Instruments	Commodity Derivatives: Statements of Operations Line Item Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions) (millions) Realized gains (losses) $ 13 $ (115) $ 60 $ (174) Unrealized gains (losses) 7 101 47 (75) Trading and marketing gains (losses), net $ 20 $ (14) $ 107 $ (249)
Schedule of Net Long or Short Positions Expected to be Realized	June 30, 2023 Crude Oil Natural Gas Natural Gas Natural Gas Year of Expiration Net Short Net Short Position Net Short Net Long (Short) Position 2023 — (16,830,500) (2,750,000) 1,280,000 2024 — (15,966,800) — (235,000) 2025 — (4,140,000) — 2,985,000 2026 — — — 535,000 June 30, 2022 Crude Oil Natural Gas Natural Gas Natural Gas Year of Expiration Net Short Net Short Position Net Short Net (Short) Long 2022 (849,000) (42,566,900) (5,347,476) (2,915,000) 2023 (1,526,000) (26,655,000) (4,281,200) (16,572,500) 2024 (720,000) (8,235,000) (1,337,000) (5,940,000) 2025 — (7,300,000) (1,441,000) (980,000) 2026 — — (1,440,000) 535,000 2027 — — (600,000) —

Partnership Equity and Distri_2

Partnership Equity and Distributions (Tables)	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Cash Distribution	Payment Date Per Unit Total Cash (millions) Distributions to common unitholders May 15, 2023 $ 0.43 $ 89 February 14, 2023 $ 0.43 $ 90 Distributions to Series B Preferred unitholders June 15, 2023 $ 0.4922 $ 3 March 15, 2023 $ 0.4922 $ 3 Distributions to Series C Preferred unitholders April 17, 2023 $ 0.4969 $ 2 January 17, 2023 $ 0.4969 $ 2

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (millions, except per unit amounts) Net income allocable to limited partners $ 84 $ 368 $ 290 $ 434 Weighted average limited partner units outstanding, basic 208,662,361 208,379,466 208,609,415 208,381,451 Dilutive effects of nonvested restricted phantom units 8,327 142,150 24,353 235,749 Weighted average limited partner units outstanding, diluted 208,670,688 208,521,616 208,633,768 208,617,200 Net income per limited partner unit, basic and diluted $ 0.40 $ 1.77 $ 1.39 $ 2.08

Restructuring (Tables)

Restructuring (Tables)	6 Months Ended
	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following table presents a rollforward of the Company's restructuring liability as of June 30, 2023, which is primarily included in Other current liabilities in the condensed consolidated balance sheets: (millions) Balance as of January 1, 2023 $ 15 Severance and employee related charges 16 Cash payments (30) Balance as of June 30, 2023 $ 1

Business Segments (Tables)

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Segment Information	Three Months Ended June 30, 2023 Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 1,561 $ 1,252 $ — $ (972) $ 1,841 Adjusted gross margin (a) $ 58 $ 371 $ — $ — $ 429 Operating and maintenance expense (8) (216) (5) — (229) General and administrative expense (1) (4) (63) — (68) Depreciation and amortization expense (4) (84) (3) — (91) Loss on sale of assets, net — (3) — — (3) Restructuring costs — — (16) — (16) Earnings from unconsolidated affiliates 147 1 — — 148 Interest expense — — (75) — (75) Net income (loss) $ 192 $ 65 $ (162) $ — $ 95 Net income attributable to noncontrolling interests — (1) — — (1) Net income (loss) attributable to partners $ 192 $ 64 $ (162) $ — $ 94 Non-cash derivative mark-to-market $ 17 $ (10) $ — $ — $ 7 Capital expenditures $ 1 $ 81 $ — $ — $ 82 Six Months Ended June 30, 2023: Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 3,953 $ 3,018 $ — $ (2,404) $ 4,567 Adjusted gross margin (a) $ 112 $ 815 $ — $ — $ 927 Operating and maintenance expense (17) (398) (11) — (426) General and administrative expense (3) (8) (137) — (148) Depreciation and amortization expense (6) (168) (7) — (181) Loss on sale of assets, net — (3) — — (3) Restructuring costs — — (26) — (26) Earnings from unconsolidated affiliates 301 7 — — 308 Interest expense — — (143) — (143) Income tax expense — — (1) — (1) Net income (loss) $ 387 $ 245 $ (325) $ — $ 307 Net income attributable to noncontrolling interests — (2) — — (2) Net income (loss) attributable to partners $ 387 $ 243 $ (325) $ — $ 305 Non-cash derivative mark-to-market $ 12 $ 35 $ — $ — $ 47 Non-cash lower of cost or net realizable value adjustments $ 22 $ — $ — $ — $ 22 Capital expenditures $ 1 $ 160 $ 2 $ — $ 163 Three Months Ended June 30, 2022 Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 3,789 $ 2,967 $ — $ (2,487) $ 4,269 Adjusted gross margin (a) $ 40 $ 585 $ — $ — $ 625 Operating and maintenance expense (9) (175) (5) — (189) General and administrative expense (2) (5) (58) — (65) Depreciation and amortization expense (3) (82) (5) — (90) Asset impairments — (1) — — (1) Other income (expense), net 10 (2) — — 8 Earnings from unconsolidated affiliates 165 3 — — 168 Interest expense — — (70) — (70) Income tax expense — — (2) — (2) Net income (loss) $ 201 $ 323 $ (140) $ — $ 384 Net income attributable to noncontrolling interests — (1) — — (1) Net income (loss) attributable to partners $ 201 $ 322 $ (140) $ — $ 383 Non-cash derivative mark-to-market $ 26 $ 75 $ — $ — $ 101 Capital expenditures $ 4 $ 31 $ 2 $ — $ 37 Investments in unconsolidated affiliates, net $ — $ — $ — $ — $ — Six Months Ended June 30, 2022: Logistics and Marketing Gathering and Processing Other Eliminations Total (millions) Total operating revenue $ 6,952 $ 5,073 $ — $ (4,381) $ 7,644 Adjusted gross margin (a) $ 56 $ 869 $ — $ — $ 925 Operating and maintenance expense (17) (315) (9) — (341) General and administrative expense (3) (9) (108) — (120) Depreciation and amortization expense (6) (163) (11) — (180) Asset impairments — (1) — — (1) Other income (expense), net 10 (2) — — 8 Gain on sale of assets, net — 7 — — 7 Earnings from unconsolidated affiliates 302 9 — — 311 Interest expense — — (141) — (141) Income tax expense — — (3) — (3) Net income (loss) $ 342 $ 395 $ (272) $ — $ 465 Net income attributable to noncontrolling interests — (2) — — (2) Net income (loss) attributable to partners $ 342 $ 393 $ (272) $ — $ 463 Non-cash derivative mark-to-market $ (19) $ (56) $ — $ — $ (75) Capital expenditures $ 6 $ 51 $ 3 $ — $ 60 Investments in unconsolidated affiliates, net $ — $ 1 $ — $ — $ 1 June 30, December 31, 2023 2022 (millions) Segment long-term assets: Gathering and Processing $ 7,573 $ 7,594 Logistics and Marketing 3,754 3,814 Other (b) 163 224 Total long-term assets 11,490 11,632 Current assets 1,002 1,702 Total assets $ 12,492 $ 13,334 (a) Adjusted gross margin consists of total operating revenues, including commodity derivative activity, less purchases and related costs. Adjusted 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, adjusted gross margin should not be considered an alternative to, or more meaningful than, net income, net cash provided by operating activities or gross margin as determined in accordance with GAAP. Our adjusted gross margin may not be comparable to similarly titled measures of other companies because other entities may not calculate adjusted gross margin in the same manner.

Statement of Cash Flows, Supple

Statement of Cash Flows, Supplemental Disclosures (Tables)	6 Months Ended
	Jun. 30, 2023
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Summary of Supplemental Cash Flow Information	Six Months Ended June 30, 2023 2022 (millions) Cash paid for interest: Cash paid for interest, net of amounts capitalized $ 145 $ 138 Cash paid for income taxes, net of income tax refunds $ 2 $ — Non-cash investing and financing activities: Property, plant and equipment acquired with accounts payable and accrued liabilities $ 24 $ 12 Other non-cash changes in property, plant and equipment $ — $ (2) Other non-cash activities: Right-of-use assets obtained in exchange for operating and finance lease liabilities $ 22 $ 14

Description of Business and B_3

Description of Business and Basis of Presentation - Additional Information (Detail) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Jun. 15, 2023
Business Acquisition [Line Items]
Business Acquisition, Share Price			$ 41.75
Investments in Greater Than 20%
Business Acquisition [Line Items]
Equity method ownership investment (as percent)	20%
Investments in Less Than 20%
Business Acquisition [Line Items]
Equity method ownership investment (as percent)	20%
DCP Midstream, LLC | DCP Midstream GP, LLC
Business Acquisition [Line Items]
Ownership interest percentage by parent	100%
Phillips 66 | DCP Midstream LP
Business Acquisition [Line Items]
Ownership interest percentage by parent		43.30%
Limited Liability Company (LLC) Or Limited Partnership (LP) Managing Member Or General Partner Ownership Interest Post Merger	86.80%
Enbridge | DCP Midstream LP
Business Acquisition [Line Items]
Limited Liability Company (LLC) Or Limited Partnership (LP) Managing Member Or General Partner Ownership Interest Post Merger	13.20%	13.20%

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Trading and marketing gains (losses), net	$ 20	$ (14)	$ 107	$ (249)
Total operating revenues	1,841	4,269	4,567	7,644
Revenue, Remaining Performance Obligation, Amount	349		$ 349
Revenue, Performance Obligation, Description of Timing			three years
Revenue from contract with customer not within the scope of Topic 606	444	708	$ 923	1,384
Buy-Sell Purchases	868	1,005	1,593	1,761
Buy-Sell Revenues	954	1,089	1,751	1,940
Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	440	1,505	1,253	2,629
NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	1,233	2,594	2,896	4,925
Transportation, Processing and Other [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	148	184	311	339
Gathering and Processing
Disaggregation of Revenue [Line Items]
Trading and marketing gains (losses), net	1	(16)	45	(210)
Total operating revenues	1,252	2,967	3,018	5,073
Gathering and Processing | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	343	1,238	1,023	2,120
Gathering and Processing | NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	778	1,579	1,676	2,861
Gathering and Processing | Transportation, Processing and Other [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	130	166	274	302
Logistics and Marketing
Disaggregation of Revenue [Line Items]
Trading and marketing gains (losses), net	19	2	62	(39)
Total operating revenues	1,561	3,789	3,953	6,952
Logistics and Marketing | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	418	1,436	1,220	2,499
Logistics and Marketing | NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	1,106	2,333	2,634	4,455
Logistics and Marketing | Transportation, Processing and Other [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	18	18	37	37
Eliminations
Disaggregation of Revenue [Line Items]
Trading and marketing gains (losses), net	0	0	0	0
Total operating revenues	(972)	(2,487)	(2,404)	(4,381)
Eliminations | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	(321)	(1,169)	(990)	(1,990)
Eliminations | NGLs and Condensate [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate	$ (651)	(1,318)	(1,414)	(2,391)
Eliminations | Transportation, Processing and Other [Member]
Disaggregation of Revenue [Line Items]
Sales of natural gas, NGLs and condensate		$ 0	$ 0	$ 0

Agreements and Transactions w_3

Agreements and Transactions with Affiliates - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Expense
Related Party Transaction [Line Items]
Employee related costs	$ 46	$ 42	$ 89	$ 82
General and Administrative Expense
Related Party Transaction [Line Items]
Employee related costs	29	42	87	75
Restructuring costs
Related Party Transaction [Line Items]
Employee related costs	$ 16	$ 0	$ 26	$ 0

Agreements and Transactions w_4

Agreements and Transactions with Affiliates - Transactions with Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Operating and maintenance expense	$ 229	$ 189	$ 426	$ 341
Affiliated Entity | Phillips 66
Related Party Transaction [Line Items]
Operating and maintenance expense	6	4	10	7
Natural Gas, NGLs and Condensate [Member] | Affiliated Entity | Unconsolidated Affiliates
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	14	24	42	56
Purchases and related costs	10	35	32	59
Natural Gas, NGLs and Condensate [Member] | Affiliated Entity | Phillips 66
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	896	1,197	1,600	2,292
Purchases and related costs	2	65	77	127
Natural Gas, NGLs and Condensate [Member] | Affiliated Entity | Enbridge
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	1	(2)	2	(2)
Purchases and related costs	0	0	0	13
Operating and maintenance expense	1	0	1	0
Transportation, Processing and Other [Member]
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	148	184	311	339
Transportation, Processing and Other [Member] | Affiliated Entity | Unconsolidated Affiliates
Related Party Transaction [Line Items]
Sales of natural gas, NGLs and condensate	4	3	8	7
Purchases and related costs	241	227	479	441
Transportation, Processing and Other [Member] | Affiliated Entity | Phillips 66
Related Party Transaction [Line Items]
Purchases and related costs	46	47	87	90
Transportation, Processing and Other [Member] | Affiliated Entity | Enbridge
Related Party Transaction [Line Items]
Purchases and related costs	$ 1	$ 1	$ 1	$ 1

Agreements and Transactions w_5

Agreements and Transactions with Affiliates - Balances with Affiliates (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Long-term debt	$ 4,901	$ 4,357
Accounts Payable	517	1,199
Other	28	27
Accrued wages and benefits	32	72
Other	139	137
Related Party
Related Party Transaction [Line Items]
Accounts Receivable	425	360
Accounts Payable	253	255
Phillips 66 | Related Party
Related Party Transaction [Line Items]
Long-term debt	100	0
Accounts Receivable	398	343
Accounts Payable	163	167
Other	7	1
Accrued wages and benefits	32	0
Other	28	0
Enbridge | Related Party
Related Party Transaction [Line Items]
Accounts Receivable	0	1
Accounts Payable	0	1
Unconsolidated Affiliates | Related Party
Related Party Transaction [Line Items]
Accounts Receivable	27	16
Accounts Payable	$ 90	$ 87

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Components Of Inventory [Line Items]
Total inventories	$ 41	$ 83
Natural Gas [Member]
Components Of Inventory [Line Items]
Total inventories	20	47
Natural Gas Liquids
Components Of Inventory [Line Items]
Total inventories	$ 21	$ 36

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Inventory Disclosure [Abstract]
Lower of cost or net realizable value adjustment	$ 22	$ 0

Property, Plant and Equipment -

Property, Plant and Equipment - Classification of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 13,903	$ 13,781
Accumulated depreciation	(6,170)	(6,018)
Property, plant and equipment, net	7,733	7,763
Gathering and transmission systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,955	7,865
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	$ 5,175	5,138
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	$ 545	563
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
Finance lease assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 32	32
Finance lease assets [Member] | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	5 years
Finance lease assets [Member] | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life of property, plant and equipment	35 years
Construction work in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 196	$ 183

Property, Plant and Equipment_3

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 90	$ 88	$ 179	$ 177

Investments In Unconsolidated_3

Investments In Unconsolidated Affiliates - Investments In Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 3,416	$ 3,475
DCP Sand Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	66.67%
Investments in unconsolidated affiliates	$ 1,637	1,653
DCP Southern Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	66.67%
Investments in unconsolidated affiliates	$ 705	713
Front Range Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	33.33%
Investments in unconsolidated affiliates	$ 187	191
Gulf Coast Express [Member]
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	25%
Investments in unconsolidated affiliates	$ 392	408
Texas Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	10%
Investments in unconsolidated affiliates	$ 88	91
Cheyenne Connector
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	50%
Investments in unconsolidated affiliates	$ 141	143
Mont Belvieu Enterprise Fractionator
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	12.50%
Investments in unconsolidated affiliates	$ 28	28
Mont Belvieu 1 Fractionator
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	20%
Investments in unconsolidated affiliates	$ 9	7
Discovery Producer Services LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership investment (as percent)	40%
Investments in unconsolidated affiliates	$ 208	219
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 21	$ 22

Investments in Unconsolidated_4

Investments in Unconsolidated Affiliates - Earnings from Investments in Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	$ 148	$ 168	$ 308	$ 311
DCP Sand Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	78	104	165	175
DCP Southern Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	27	21	52	45
Front Range Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	11	11	22	21
Gulf Coast Express [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	18	16	35	32
Texas Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	5	5	10	10
Cheyenne Connector
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	3	3	6	7
Mont Belvieu Enterprise Fractionator
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	1	2	2	4
Mont Belvieu 1 Fractionator
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	4	3	8	7
Discovery Producer Services LLC
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	1	3	7	9
Other
Schedule of Equity Method Investments [Line Items]
Earnings from unconsolidated affiliates	$ 0	$ 0	$ 1	$ 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				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Equity Method Statement of Operations [Line Items]
Total operating revenues	$ 1,841		$ 4,269		$ 4,567	$ 7,644
Net (loss) income	95	$ 212	384	$ 81	307	465
Unconsolidated Affiliates
Schedule of Equity Method Statement of Operations [Line Items]
Total operating revenues	541		626		1,136	1,189
Operating Expenses	214		246		436	463
Net (loss) income	$ 328		$ 380		$ 707	$ 724

Fair Value Measurement - Financ

Fair Value Measurement - Financial Instruments Carried at Fair Value (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 10	$ 3	$ 10	$ 3	$ 15	$ 17	$ 2	$ 0
Transfers out of Level 3	(9)	1	(8)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(2)	(1)	(4)	0
Net realized and unrealized gains (losses) included in earnings	6	3	5	3
Net unrealized gains (losses) on derivatives still held included in earnings	4	3	6	3
Current Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	60		60			140
Current Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			1
Long- Term Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	1	6	1	6	1	3	4	2
Transfers out of Level 3	(1)	0	(2)	(2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	1	0	0	0
Net realized and unrealized gains (losses) included in earnings	0	2	0	6
Net unrealized gains (losses) on derivatives still held included in earnings	0	3	1	4
Long- Term Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	17		17			26
Long- Term Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			42
Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value	(4)	(3)	(4)	(3)	(1)	(2)	(10)	(3)
Settlements	(1)	0	(1)	2
Net realized and unrealized (losses) gains included in earnings	(6)	5	(2)	(6)
Net unrealized gains (losses) on derivatives still held included in earnings	(3)	5	(3)	(2)
Transfers out of Level 3	4	2	1	4
Current Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	36		36			148
Long- Term Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value	(1)	(4)	(1)	(4)	$ (1)	(3)	$ (5)	$ (4)
Settlements	0	0	0	0
Net realized and unrealized (losses) gains included in earnings	(1)	0	1	(6)
Net unrealized gains (losses) on derivatives still held included in earnings	0	(6)	(1)	(3)
Transfers out of Level 3	1	$ 1	1	$ 6
Long- Term Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	13		13			35
Level 1 | Current Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	1		1			2
Level 1 | Current Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			0
Level 1 | Long- Term Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	0		0			0
Level 1 | Long- Term Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			42
Level 1 | Current Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	1		1			4
Level 1 | Long- Term Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	0		0			0
Level 2 | Current Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	49		49			121
Level 2 | Current Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			1
Level 2 | Long- Term Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	16		16			23
Level 2 | Long- Term Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			0
Level 2 | Current Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	31		31			142
Level 2 | Long- Term Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	12		12			32
Level 3 | Current Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	10		10			17
Level 3 | Current Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			0
Level 3 | Long- Term Assets | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - assets	1		1			3
Level 3 | Long- Term Assets | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted Investments, at Fair Value	0		0			0
Level 3 | Current Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	4		4			2
Level 3 | Long- Term Liabilities | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivatives - liabilities	$ 1		$ 1			$ 3

Fair Value Measurement - Conden

Fair Value Measurement - Condensed Consolidated Balance Sheets for Derivative Financial Instruments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Current Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 15	$ 2	$ 17	$ 0
Net realized and unrealized gains (losses) included in earnings	6	3	5	3
Transfers out of Level 3	(9)	1	(8)	0
Settlements	(2)	(1)	(4)	0
Ending balance	10	3	10	3
Net unrealized gains (losses) on derivatives still held included in earnings	4	3	6	3
Long- Term Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1	4	3	2
Net realized and unrealized gains (losses) included in earnings	0	2	0	6
Transfers out of Level 3	(1)	0	(2)	(2)
Settlements	1	0	0	0
Ending balance	1	6	1	6
Net unrealized gains (losses) on derivatives still held included in earnings	0	3	1	4
Current Liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net unrealized gains (losses) on derivatives still held included in earnings	(3)	5	(3)	(2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(1)	(10)	(2)	(3)
Net realized and unrealized (losses) gains included in earnings	(6)	5	(2)	(6)
Transfers out of Level 3	4	2	1	4
Settlements	(1)	0	(1)	2
Ending Balance	(4)	(3)	(4)	(3)
Long- Term Liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net unrealized gains (losses) on derivatives still held included in earnings	0	(6)	(1)	(3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(1)	(5)	(3)	(4)
Net realized and unrealized (losses) gains included in earnings	(1)	0	1	(6)
Transfers out of Level 3	1	1	1	6
Settlements	0	0	0	0
Ending Balance	$ (1)	$ (4)	$ (1)	$ (4)

Schedule of Valuation Processes

Schedule of Valuation Processes (Detail) - Level 3 - Market Approach Valuation Technique $ in Millions	Jun. 30, 2023 USD ($) $ / gal
Derivative Liabilities | Natural Gas Liquids
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Liabilities, fair value | $	$ (4)
Derivative Liabilities | Natural Gas Liquids | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	0.24
Derivative Liabilities | Natural Gas Liquids | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	1.33
Derivative Liabilities | Natural Gas Liquids | Weighted Average [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	0.81
Derivative Liabilities | Natural Gas [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Liabilities, fair value | $	$ (1)
Derivative Liabilities | Natural Gas [Member] | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	2.73
Derivative Liabilities | Natural Gas [Member] | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	4.71
Derivative Liabilities | Natural Gas [Member] | Weighted Average [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	3.16
Derivative Assets | Natural Gas Liquids
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Assets | $	$ 10
Derivative Assets | Natural Gas Liquids | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	0.24
Derivative Assets | Natural Gas Liquids | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	1.29
Derivative Assets | Natural Gas Liquids | Weighted Average [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	0.68
Derivative Assets | Natural Gas [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Assets | $	$ 1
Derivative Assets | Natural Gas [Member] | Minimum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	2.73
Derivative Assets | Natural Gas [Member] | Maximum
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	4.71
Derivative Assets | Natural Gas [Member] | Weighted Average [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Forward curve prices	1.96

Fair Value Measures and Disclos

Fair Value Measures and Disclosures (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Operating Lease, Impairment Loss	$ 10	$ 10

Carrying Value and Fair Value o

Carrying Value and Fair Value of Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Total Debt, Carrying Value	$ 5,013	$ 4,874
Total Debt, Fair Value	$ 4,976	$ 4,772

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($) $ in Millions			6 Months Ended
	May 19, 2023	Mar. 15, 2023	Jun. 30, 2023
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Accounts Recievable included in the Securitization Transaction			$ 785
Line of Credit Facility, Current Borrowing Capacity			350
Line of credit uncommitted option to increase			400
Accounts Receivable Securitization Agreement			280
Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			1,400
Letter of credit amount outstanding			(2)
Debt covenants, maximum borrowing amount			548
Credit Facility Outstanding Borrowings			(850)
Intercompany Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,000
Basis spread determined by credit rating			0.075%
Commitment fee percentage			0.175%
Debt covenants, maximum borrowing amount			$ 900
Line of credit uncommitted option to increase			500
Credit Facility Outstanding Borrowings			$ (100)
Intercompany Credit Agreement | Federal Funds Rate
Debt Instrument [Line Items]
Variable rate basis spread			0.50%
Intercompany Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Variable rate basis spread			1.075%
Intercompany Credit Agreement | SOFR Plus
Debt Instrument [Line Items]
Variable rate basis spread			1%
Intercompany Credit Agreement | Adjustment to applicable margin
Debt Instrument [Line Items]
Variable rate basis spread			0.10%
Issued March 2013, interest at 3.875% payable semi-annually, due March 2023 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.875%
Extinguishment of Debt, Amount		$ 500
Issued May 2013, interest at 5.850% payable semi-annually, due May 2043 | Junior subordinated notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.85%
Extinguishment of Debt, Amount	$ 550

Debt - Future Maturities of Lon

Debt - Future Maturities of Long-Term Debt (Detail) $ in Millions	Jun. 30, 2023 USD ($)
Maturities of Long-term Debt [Abstract]
2023	$ 0
2024	280
2025	825
2026	0
2027	1,350
Thereafter	2,550
Long Term Debt Maturities Repayments Of Principal Total	$ 5,005

Risk Management and Hedging A_3

Risk Management and Hedging Activities - Additional Information (Detail) $ in Millions	Jun. 30, 2023 USD ($)
Derivative [Line Items]
Collateral, cash deposits	$ 3
Letters of credit received	$ 23

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	Jun. 30, 2023	Dec. 31, 2022
Offsetting Assets [Line Items]
Commodity derivatives - assets	$ 77	$ 166
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(8)	0
Derivative Asset	69	166
Commodity derivatives - liabilities	(49)	(183)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	8	0
Derivative Liability	$ (41)	$ (183)

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	Jun. 30, 2023	Dec. 31, 2022
Derivative Asset [Abstract]
Derivative Instruments and Hedges, Current Assets	$ 60	$ 140
Derivative Instruments and Hedges, Assets, Noncurrent	17	26
Derivative Liability [Abstract]
Derivative Instruments and Hedges, Current Liabilities	36	148
Derivative Instruments and Hedges, Liabilities, Noncurrent	13	35
Commodity derivatives | Derivative Asset Not Designated As Hedging Instruments [Member]
Derivative Asset [Abstract]
Derivative Instruments and Hedges, Current Assets	60	140
Derivative Instruments and Hedges, Assets, Noncurrent	17	26
Derivative Instruments Not Designated as Hedging Instruments, Total Assets, at Fair Value	77	166
Commodity derivatives | Derivative Liabilities Not Designated As Hedging Instruments [Member]
Derivative Liability [Abstract]
Derivative Instruments and Hedges, Current Liabilities	36	148
Derivative Instruments and Hedges, Liabilities, Noncurrent	13	35
Derivative Instruments Not Designated as Hedging Instruments, Total Liabilities, at Fair Value	$ 49	$ 183

Risk Management and Hedging A_6

Risk Management and Hedging Activities - Schedule of Changes in Derivative Instruments not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative [Line Items]
Trading and marketing (losses) gains, net	$ 20	$ (14)	$ 107	$ (249)
Derivative Assets Not Designated As Hedging Instruments | Commodity derivatives
Derivative [Line Items]
Realized gains	13	(115)	60	(174)
Unrealized gains (losses)	7	101	47	(75)
Trading and marketing (losses) gains, net	$ 20	$ (14)	$ 107	$ (249)

Risk Management and Hedging A_7

Risk Management and Hedging Activities - Schedule of Net Long or Short Positions Expected to be Realized (Detail)	6 Months Ended
	Jun. 30, 2023 MMBTU bbl	Jun. 30, 2022 MMBTU bbl
Crude Oil
Net (Short) Position, Volume [Abstract]
Net (Short) Position (Bbls), Year One | bbl	0	(849,000)
Net (Short) Position (Bbls), Year Two | bbl	0	(1,526,000)
Net (Short) Position (Bbls), Year Three | bbl	0	(720,000)
Net (Short) Position (Bbls), Year Four | bbl	0	0
Net Long (Short) Position (Bbls), Year Five | bbl		0
Net (Short) Positions (Bbls), Year Six | bbl		0
Natural Gas [Member]
Net Long (Short) Position, MMBtu [Abstract]
Net (Short) Long Position (MMBtu), Year One | MMBTU	(16,830,500)	(42,566,900)
Net (Short) Long Position (MMBtu), Year Two | MMBTU	(15,966,800)	(26,655,000)
Net Long Position (MMBtu), Year Three | MMBTU	(4,140,000)	(8,235,000)
Net Long Position (MMBtu), Year Four | MMBTU	0	(7,300,000)
Net Long Position (MMBtu), Year Five | MMBTU		0
Net Long (Short) Positions (MMBtu), year Six | MMBTU	0
Natural Gas Liquids
Net (Short) Position, Volume [Abstract]
Net (Short) Position (Bbls), Year One | bbl	(2,750,000)	(5,347,476)
Net (Short) Position (Bbls), Year Two | bbl	0	(4,281,200)
Net (Short) Position (Bbls), Year Three | bbl	0	(1,337,000)
Net (Short) Position (Bbls), Year Four | bbl	0	(1,441,000)
Net Long (Short) Position (Bbls), Year Five | bbl		(1,440,000)
Net (Short) Positions (Bbls), Year Six | bbl		(600,000)
Natural Gas Basis Swaps
Net Long (Short) Position, MMBtu [Abstract]
Net (Short) Long Position (MMBtu), Year One | MMBTU	1,280,000	(2,915,000)
Net (Short) Long Position (MMBtu), Year Two | MMBTU	(235,000)	(16,572,500)
Net Long Position (MMBtu), Year Three | MMBTU	2,985,000	(5,940,000)
Net Long Position (MMBtu), Year Four | MMBTU	535,000	(980,000)
Net Long Position (MMBtu), Year Five | MMBTU		535,000
Net Long (Short) Positions (MMBtu), year Six | MMBTU		0

Partnership Equity and Distri_3

Partnership Equity and Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended				6 Months Ended
	Apr. 17, 2023	Jan. 17, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 15, 2023
Partnership Equity And Distribution [Line Items]
Payments for Repurchase of Redeemable Preferred Stock			$ (161)				$ (161)	$ 0
Preferred Stock, Redemption Price Per Share									$ 25
Preferred Stock Redemption Premium			(5)		$ 0		$ (5)	$ 0
Total Cash Distribution			94	$ 95	106	$ 86
Series C Preferred Limited Partners [Member]
Partnership Equity And Distribution [Line Items]
Total Cash Distribution	$ 2	$ 2	$ 2	$ 2	$ 3	$ 2
Preferred Limited Partnership Unit; Distribution Amount Declared	$ 0.4969	$ 0.4969

Partnership Equity and Distri_4

Partnership Equity and Distributions - Cash Distribution (Detail) - USD ($) $ / shares in Units, $ in Millions							3 Months Ended
	Jun. 15, 2023	May 15, 2023	Apr. 17, 2023	Mar. 15, 2023	Feb. 14, 2023	Jan. 17, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022
Distribution Made to Limited Partner [Line Items]
Total Cash Distribution							$ 94	$ 95	$ 106	$ 86
Series B Preferred Limited Partners [Member]
Distribution Made to Limited Partner [Line Items]
Preferred Limited Partnership Distribution; Distribution Amount Paid	$ 0.4922			$ 0.4922
Total Cash Distribution	$ 3			$ 3			3	3	3	3
Series C Preferred Limited Partners [Member]
Distribution Made to Limited Partner [Line Items]
Preferred Limited Partnership Distribution; Distribution Amount Paid			$ 0.4969			$ 0.4969
Total Cash Distribution			$ 2			$ 2	2	2	3	2
Limited Partners
Distribution Made to Limited Partner [Line Items]
Per Unit Distribution (in dollars per share)		$ 0.43			$ 0.43
Total Cash Distribution		$ 89			$ 90		$ 89	$ 90	$ 82	$ 81

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Details)	Dec. 31, 2022 shares
Strategic Performance Units (SPUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	327,190
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	532,432

Net Income or Loss per Limite_2

Net Income or Loss per Limited Partner Unit Additional Detail (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Weighted Average Number Diluted Shares Outstanding Adjustment	208,670,688	208,521,616	208,633,768	208,617,200
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$ 0.40	$ 1.77	$ 1.39	$ 2.08
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	8,327	142,150	24,353	235,749
Weighted Average Number of Shares Outstanding, Basic	208,662,361	208,379,466	208,609,415	208,381,451
Net Income (Loss) Allocated to Limited Partners	$ 84	$ 368	$ 290	$ 434

Restructuring (Details)

Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1		$ 1		$ 15
Severance Costs			16
Payments for Restructuring			(30)
Restructuring costs	$ 16	$ 0	$ 26	$ 0

Business Segments - Segment Inf

Business Segments - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total operating revenues	$ 1,841		$ 4,269		$ 4,567	$ 7,644
Gross margin	429		625		927	925
Operating and maintenance expense	(229)		(189)		(426)	(341)
Depreciation and amortization expense	(91)		(90)		(181)	(180)
General and administrative expense	(68)		(65)		(148)	(120)
Asset Impairments	0		(1)		0	(1)
Other expense, net	0		8		0	8
Loss on sale of assets, net	(3)		0		(3)	7
Restructuring Costs	(16)		0		(26)	0
Earnings from unconsolidated affiliates	148		168		308	311
Interest expense, net	(75)		(70)		(143)	(141)
Income tax expense	0		(2)		(1)	(3)
Net income	95	$ 212	384	$ 81	307	465
Net income attributable to noncontrolling interests	(1)		(1)		(2)	(2)
Net income attributable to partners	94		383		305	463
Non-cash derivative mark-to-market	7		101		47	(75)
Non-cash lower of cost or net realizable value adjustment					22	0
Capital expenditures	82		37		163	60
Investments in unconsolidated affiliates, net			0			1
Logistics and Marketing
Segment Reporting Information [Line Items]
Total operating revenues	1,561		3,789		3,953	6,952
Gathering and Processing
Segment Reporting Information [Line Items]
Total operating revenues	1,252		2,967		3,018	5,073
Eliminations
Segment Reporting Information [Line Items]
Total operating revenues	(972)		(2,487)		(2,404)	(4,381)
Operating Segments | Logistics and Marketing
Segment Reporting Information [Line Items]
Total operating revenues	1,561		3,789		3,953	6,952
Gross margin	58		40		112	56
Operating and maintenance expense	(8)		(9)		(17)	(17)
Depreciation and amortization expense	(4)		(3)		(6)	(6)
General and administrative expense	(1)		(2)		(3)	(3)
Asset Impairments			0			0
Other expense, net			10			10
Loss on sale of assets, net	0				0	0
Restructuring Costs	0				0
Earnings from unconsolidated affiliates	147		165		301	302
Interest expense, net	0		0		0	0
Income tax expense			0		0	0
Net income	192		201		387	342
Net income attributable to noncontrolling interests	0		0		0	0
Net income attributable to partners	192		201		387	342
Non-cash derivative mark-to-market	17		26		12	(19)
Non-cash lower of cost or net realizable value adjustment	0				22
Capital expenditures	1		4		1	6
Investments in unconsolidated affiliates, net			0			0
Operating Segments | Gathering and Processing
Segment Reporting Information [Line Items]
Total operating revenues	1,252		2,967		3,018	5,073
Gross margin	371		585		815	869
Operating and maintenance expense	(216)		(175)		(398)	(315)
Depreciation and amortization expense	(84)		(82)		(168)	(163)
General and administrative expense	(4)		(5)		(8)	(9)
Asset Impairments			(1)			(1)
Other expense, net			(2)			(2)
Loss on sale of assets, net	(3)				(3)	7
Restructuring Costs	0				0
Earnings from unconsolidated affiliates	1		3		7	9
Interest expense, net	0		0		0	0
Income tax expense			0		0	0
Net income	65		323		245	395
Net income attributable to noncontrolling interests	(1)		(1)		(2)	(2)
Net income attributable to partners	64		322		243	393
Non-cash derivative mark-to-market	(10)		75		35	(56)
Non-cash lower of cost or net realizable value adjustment					0
Capital expenditures	81		31		160	51
Investments in unconsolidated affiliates, net			0			1
Other
Segment Reporting Information [Line Items]
Total operating revenues	0		0		0	0
Gross margin	0		0		0	0
Operating and maintenance expense	(5)		(5)		(11)	(9)
Depreciation and amortization expense	(3)		(5)		(7)	(11)
General and administrative expense	(63)		(58)		(137)	(108)
Asset Impairments			0			0
Other expense, net			0			0
Loss on sale of assets, net	0				0	0
Restructuring Costs	(16)				(26)
Earnings from unconsolidated affiliates	0		0		0	0
Interest expense, net	(75)		(70)		(143)	(141)
Income tax expense			(2)		(1)	(3)
Net income	(162)		(140)		(325)	(272)
Net income attributable to noncontrolling interests	0		0		0	0
Net income attributable to partners	(162)		(140)		(325)	(272)
Non-cash derivative mark-to-market	0		0		0	0
Non-cash lower of cost or net realizable value adjustment					0
Capital expenditures	0		2		2	3
Investments in unconsolidated affiliates, net			0			0
Eliminations
Segment Reporting Information [Line Items]
Total operating revenues	(972)		(2,487)		(2,404)	(4,381)
Gross margin	0		0		0	0
Operating and maintenance expense						0
Depreciation and amortization expense	0		0		0	0
General and administrative expense	0		0		0	0
Asset Impairments						0
Other expense, net						0
Loss on sale of assets, net	0				0
Restructuring Costs	0				0
Earnings from unconsolidated affiliates	0		0		0	0
Interest expense, net	0		0		0	0
Income tax expense			0		0	0
Net income	0		0		0	0
Net income attributable to noncontrolling interests	0		0		0	0
Net income attributable to partners	0		0		0	0
Non-cash derivative mark-to-market	0		0		0	0
Non-cash lower of cost or net realizable value adjustment					0
Capital expenditures	$ 0		0		$ 0	0
Investments in unconsolidated affiliates, net			$ 0			$ 0

Business Segments - Segment Ass

Business Segments - Segment Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	$ 11,490	$ 11,632
Current assets	1,002	1,702
Total assets	12,492	13,334
Operating Segments | Logistics and Marketing
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	3,754	3,814
Operating Segments | Gathering and Processing
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	7,573	7,594
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Segment long-term assets	$ 163	$ 224

Statement of Cash Flows, Supp_2

Statement of Cash Flows, Supplemental Disclosures (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Income Taxes Paid, Net	$ 2	$ 0
Property, plant and equipment acquired with accounts payable and accrued liabilities	24	12
Property, Plant and Equipment, Other Increase (Decrease)	0	(2)
Right-of-Use Assets Obtained in Exchange for Operating and Finance Lease Liabilities	22	14
Cash paid for interest, net of amounts capitalized	$ 145	$ 138

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - $ / shares	Jul. 14, 2023	Jun. 15, 2023	Apr. 17, 2023	Mar. 15, 2023	Jan. 17, 2023
Series B Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partnership Unit; Distribution Amount Declared		$ 0.4922		$ 0.4922
Series C Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partnership Unit; Distribution Amount Declared			$ 0.4969		$ 0.4969
Subsequent Event [Member]
Subsequent Event [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.43
Distribution Made to Limited Partner, Date of Record	Jul. 31, 2023
Distribution Made to Limited Partner, Distribution Date	Aug. 11, 2023
Subsequent Event [Member] | Series C Preferred Limited Partners [Member]
Subsequent Event [Line Items]
Preferred Limited Partner Distribution: Record Date	Oct. 02, 2023
Preferred Limited Partnership Distribution; Distribution Date	Oct. 16, 2023
Preferred Limited Partnership Unit; Distribution Amount Declared	$ 0.4969