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Acquisitions, Divestitures and Other Transactions - Other Acquisitions Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) | Jan. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Aug. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Nov. 30, 2023 USD ($) | Oct. 31, 2022 USD ($) | Jul. 31, 2022 USD ($) | Sep. 30, 2023 | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 30, 2024 | Jul. 31, 2024 | Feb. 29, 2024
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  |  |  |  |  |  |  | $ 248 | $ 425 | $ 149 |  |  |
Pipeline and Termination Terminal Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire productive assets |  |  |  |  |  |  |  |  |  | $ 32 |  |  |  |  |  |
Northern Delaware Basin Gathering System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition amount, net to our interest in the Permian JV |  |  |  |  |  | $ 88 |  |  |  |  |  |  |  |  |  |
Certain Straddle Plants | NGL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred |  |  |  |  |  |  | $ 122 |  |  |  |  |  |  |  |  |
Obligation, processing capacity term (in years) |  |  |  |  |  |  | 50 years |  |  |  |  |  |  |  |  |
Revenue recognition term (in years) |  |  |  |  |  |  | 50 years |  |  |  |  |  |  |  |  |
Plains Oryx Permian Basin LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated subsidiary, ownership interest (as a percent) |  |  |  |  |  | 65.00% |  | 65.00% | 65.00% |  |  |  |  |  |  |
Subsequent Event | Plains Oryx Permian Basin LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated subsidiary, ownership interest (as a percent) |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Series A Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred units, outstanding repurchased rate |  | 0.18 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Common Units and Series A Preferred Units | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred units, outstanding repurchased rate |  | 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
EMG Medallion 2 Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other payments to acquire businesses |  |  |  |  |  |  |  |  |  |  | $ 16 |  |  |  |  |
EMG Medallion 2 Holdings, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition amount, net to our interest in the Permian JV |  | $ 105 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Midway Pipeline LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, including working capital and other adjustments | $ 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest acquired (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition (as a percent) | 100.00% |  | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Business combination, step acquisition, equity interest in acquire (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Midway Pipeline LLC | Gains/(losses) on investments in unconsolidated entities, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, remeasurement gain |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Wink to Webster Pipeline LLC (“W2W Pipeline”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest acquired (as a percent) |  |  |  | 0.67% |  |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition (as a percent) |  |  |  | 17.00% |  |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquire (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.00% |
Payments to acquire businesses |  |  |  | $ 20 |  |  |  |  |  |  |  |  |  |  |  |
Saddlehorn Pipeline Company, LLC (“Saddlehorn”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest acquired (as a percent) |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition (as a percent) |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquire (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00%
Payments to acquire businesses |  |  |  |  | $ 91 |  |  |  |  |  |  |  |  |  |  |
Advantage Pipeline Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, including working capital and other adjustments |  |  |  |  |  |  |  | $ 74 |  |  |  |  |  |  |  |
Business acquisition amount, net to our interest in the Permian JV |  |  |  |  |  |  |  | $ 48 |  |  |  |  |  |  |  |
Additional interest acquired (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
EnCap Flatrock Midstream | Ironwood Midstream Energy Partners II, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, including working capital and other adjustments |  | 475 |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Energy & Minerals Group | EMG Medallion 2 Holdings, LLC | Subsequent Event | Plains Oryx Permian Basin LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, including working capital and other adjustments |  | $ 161 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary of LM Energy Partners | Plains Oryx Permian Basin LLC | Northern Delaware Basin Gathering System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred |  |  |  |  |  | $ 135 |  |  |  |  |  |  |  |  |  |

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