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Net Income Per Common Unit - Schedule of Computation of Basic and Diluted Net Income per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Basic and Diluted Net Income per Common Unit |  |  |
Net income attributable to PAA | $ 772 | $ 1,230 | $ 1,037
Amounts allocated to participating securities | (10) | (10) | (5)
Other | 5 | 5 |
Net income allocated to common unitholders — Basic | 514 | 976 | 831
Net income allocated to common unitholders — Diluted | 514 | 976 | 831
Series A Preferred Units |  |  |
Basic and Diluted Net Income per Common Unit |  |  |
Distributions to preferred unitholders | $ (175) | $ (173) | $ (149)
Series A Preferred Units | Weighted Average |  |  |
Net Income Per Common Unit |  |  |
Antidilutive securities excluded from computation of net income per common unit (in units) | 71 | 71 | 71
Series B Preferred Units |  |  |
Basic and Diluted Net Income per Common Unit |  |  |
Distributions to preferred unitholders | $ (78) | $ (76) | $ (52)
Common Units |  |  |
Basic and Diluted Net Income per Common Unit |  |  |
Basic weighted average common units outstanding (in units) | 702 | 699 | 701
Diluted weighted average common units outstanding (in units) | 702 | 699 | 701
Basic net income per common unit (in dollars per unit) | $ 0.73 | $ 1.40 | $ 1.19
Diluted net income per common unit (in dollars per unit) | $ 0.73 | $ 1.40 | $ 1.19

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