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Acquisitions, Divestitures and Other Transactions - Joint Venture Transaction Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2023
Jul. 31, 2022
Oct. 31, 2021
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2021
Joint Venture Transaction | Plains Oryx Permian Basin LLC | Level 3            
Business Acquisition [Line Items]            
Identifiable assets acquired and liabilities assumed     $ 3,230      
Joint Venture Transaction | Plains Oryx Permian Basin LLC | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow            
Business Acquisition [Line Items]            
Business combination, measurement input     0.12      
Joint Venture Transaction | Plains Oryx Permian Basin LLC | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow | Intangible Assets            
Business Acquisition [Line Items]            
Business combination, measurement input     0.16      
Joint Venture Transaction | Plains Oryx Permian Basin LLC | Level 3 | Measurement Input, Market Multiple | Valuation, Market Approach | Minimum            
Business Acquisition [Line Items]            
Business combination, measurement input     9.5      
Joint Venture Transaction | Plains Oryx Permian Basin LLC | Level 3 | Measurement Input, Market Multiple | Valuation, Market Approach | Maximum            
Business Acquisition [Line Items]            
Business combination, measurement input     11.0      
Joint Venture Transaction | Plains Oryx Permian Basin LLC | Plains Oryx Permian Basin LLC            
Business Acquisition [Line Items]            
Members' equity     $ 7,529      
Joint Venture Transaction | Oryx Midstream Holdings LLC | Plains Oryx Permian Basin LLC            
Business Acquisition [Line Items]            
Consideration transferred     3,230      
Identifiable assets acquired and liabilities assumed     $ 3,230      
Transaction-related costs           $ 17
Schedule of Partners' Capital        
The following table presents the amounts recognized in partners’ capital associated with this transaction (in millions):

Recognized Amount
Noncontrolling interests$2,635 
Partners’ capital, excluding noncontrolling interests595 
$3,230 
  
Schedule of Pro Forma Information         These results are not necessarily indicative of the results that might have actually occurred had the merger taken place on January 1, 2021; furthermore, this financial information is not intended to be a projection of future results (in millions, except per unit amounts):
Year Ended
December 31, 2021
Total revenues$42,359 
Net income attributable to PAA
$524 
Net income allocated to common unitholders
$324 
Basic and diluted net income per common unit
$0.45 
  
Modified Sharing Arrangement | Plains Oryx Permian Basin LLC            
Business Acquisition [Line Items]            
Schedule of Modified Revenue Sharing Arrangement        
Under the MSA, distributions will be allocated as follows (in millions):

Available CashDistributions Percentages
TierAnnualized PAAOryx
1Up to $30050%50%
2$300 - $428100%—%
3$428 - $81565%35%
4$815 and above70%30%
  
Modified Sharing Arrangement | Oryx Midstream Holdings LLC | Plains Oryx Permian Basin LLC            
Business Acquisition [Line Items]            
Distribution percentage after termination of modified sharing arrangement     65.00%      
Modified Sharing Arrangement | Oryx Midstream Holdings LLC | Plains Oryx Permian Basin LLC | Maximum            
Business Acquisition [Line Items]            
Modified revenue sharing arrangement, term     10 years      
Modified Sharing Arrangement | Oryx Midstream Holdings LLC | Plains Oryx Permian Basin LLC | Plains Oryx Permian Basin LLC            
Business Acquisition [Line Items]            
Distribution percentage after termination of modified sharing arrangement     35.00%      
Plains Oryx Permian Basin LLC            
Business Acquisition [Line Items]            
Consolidated subsidiary, ownership interest held by the parent (as a percent) 65.00% 65.00%   65.00%    
Noncontrolling interest, ownership (as a percent)         35.00%  
Plains Oryx Permian Basin LLC | Joint Venture Transaction            
Business Acquisition [Line Items]            
Consolidated subsidiary, ownership interest held by the parent (as a percent)     65.00%      
Plains Oryx Permian Basin LLC | Joint Venture Transaction | Plains Oryx Permian Basin LLC            
Business Acquisition [Line Items]            
Noncontrolling interest, ownership (as a percent)     35.00%      
Plains Oryx Permian Basin LLC | Joint Venture Transaction | Oryx Midstream Holdings LLC            
Business Acquisition [Line Items]            
Noncontrolling interest, ownership (as a percent)     35.00%      
PAA | Stonepeak Infrastructure Partners | Stonepeak Infrastructure Partners, Affiliates | Series A Preferred Units            
Business Acquisition [Line Items]            
Ownership interest (as a percent)     8.90%      
PAA | Stonepeak Infrastructure Partners | Stonepeak Infrastructure Partners, Affiliates | Maximum | Limited Partners            
Business Acquisition [Line Items]            
Ownership interest (as a percent)     1.00%