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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