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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic and Diluted Net Income per Common Unit              
Income from continuing operations, net of tax   $ 453     $ 198 $ 1,061 $ 837
Net income attributable to noncontrolling interests   (88)     (92) (249) (257)
Net income from continuing operations attributable to PAA   365     106 812 580
Amounts allocated to participating securities   (1)     (1) (10) (9)
Other   1     1 3 3
Net income from continuing operations allocated to common unitholders - Basic   311     43 599 384
Net income from continuing operations allocated to common unitholders - Diluted   311     43 599 384
Net income from discontinued operations allocated to common unitholders - Basic   76     114 281 156
Net income from discontinued operations allocated to common unitholders - Diluted   76     114 281 156
Net income allocated to common unitholders - Basic   387     157 880 540
Net income allocated to common unitholders - Diluted   $ 387     $ 157 $ 880 $ 540
Basic net income per common unit: continuing operations (usd per unit)   $ 0.44     $ 0.06 $ 0.85 $ 0.55
Diluted net income per common unit: continuing operations (usd per unit)   0.44     0.06 0.85 0.55
Basic net income per common unit: discontinuing operations (usd per unit)   0.11     0.16 0.40 0.22
Diluted net income per common unit: discontinuing operations (usd per unit)   $ 0.11     $ 0.16 $ 0.40 $ 0.22
Series A Preferred Units              
Basic and Diluted Net Income per Common Unit              
Distributions to preferred unitholders   $ (36)     $ (44) $ (110) $ (131)
Impact from repurchase of Series A preferred units   0     0 (43) 0
Repurchase and cancellation of common units under the common equity repurchase program (units) 12,700,000   0 12,678,560      
Series B Preferred Units              
Basic and Diluted Net Income per Common Unit              
Distributions to preferred unitholders   $ (18)     $ (19) $ (53) $ (59)
Repurchase and cancellation of common units under the common equity repurchase program (units)     0 0      
Common Units              
Basic and Diluted Net Income per Common Unit              
Basic weighted average common units outstanding (units)   704,000,000     702,000,000 704,000,000 702,000,000
Diluted weighted average common units outstanding (units)   704,000,000     702,000,000 704,000,000 702,000,000
Basic net income per common unit (usd per unit)   $ 0.55     $ 0.22 $ 1.25 $ 0.77
Diluted net income per common unit (usd per unit)   $ 0.55     $ 0.22 $ 1.25 $ 0.77
Repurchase and cancellation of common units under the common equity repurchase program (units)     476,695 0      
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 60,000,000 71,000,000