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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jan. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Basic and Diluted Net Income per Common Unit            
Income from continuing operations, net of tax   $ 227   $ 298 $ 607 $ 639
Net income attributable to noncontrolling interests   (87)   (80) (160) (166)
Net income from continuing operations attributable to PAA   140   218 447 473
Amounts allocated to participating securities   (7)   (8) (9) (9)
Other   1   1 2 3
Net income from continuing operations allocated to common unitholders - Basic   80   148 287 340
Net income from continuing operations allocated to common unitholders - Diluted   80   148 287 340
Net income from discontinued operations allocated to common unitholders - Basic   70   32 206 42
Net income from discontinued operations allocated to common unitholders - Diluted   70   32 206 42
Net income allocated to common unitholders - Basic   150   180 493 382
Net income allocated to common unitholders - Diluted   $ 150   $ 180 $ 493 $ 382
Basic net income per common unit: continuing operations (usd per unit)   $ 0.11   $ 0.21 $ 0.41 $ 0.49
Diluted net income per common unit: continuing operations (usd per unit)   0.11   0.21 0.41 0.49
Basic net income per common unit: discontinuing operations (usd per unit)   0.10   0.05 0.29 0.06
Diluted net income per common unit: discontinuing operations (usd per unit)   $ 0.10   $ 0.05 $ 0.29 $ 0.06
Series A Preferred Units            
Basic and Diluted Net Income per Common Unit            
Distributions to preferred unitholders   $ (36)   $ (44) $ (75) $ (88)
Impact from repurchase of Series A preferred units   0     (43)  
Repurchase and cancellation of common units under the common equity repurchase program (units) 12,700,000   12,678,560      
Series B Preferred Units            
Basic and Diluted Net Income per Common Unit            
Distributions to preferred unitholders   $ (18)   $ (19) $ (35) $ (39)
Common Units            
Basic and Diluted Net Income per Common Unit            
Basic weighted average common units outstanding (units)   703,000,000   701,000,000 704,000,000 701,000,000
Diluted weighted average common units outstanding (units)   703,000,000   701,000,000 704,000,000 701,000,000
Basic net income per common unit (usd per unit)   $ 0.21   $ 0.26 $ 0.70 $ 0.55
Diluted net income per common unit (usd per unit)   $ 0.21   $ 0.26 $ 0.70 $ 0.55
Repurchase and cancellation of common units under the common equity repurchase program (units)   476,695        
Weighted Average | Series A Preferred Units            
Basic and Diluted Net Income Per Common Unit [Line Items]            
Antidilutive securities excluded from computation of net income per common unit (units)   58,000,000   71,000,000 61,000,000 71,000,000