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Net Income/(Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |
Net income/(loss) attributable to PAA | $ 1,037 | $ 593 | $ (2,590)
Amounts allocated to participating securities | (5) | (2) | (2)
Net income/(loss) allocated to common unitholders — Basic | 831 | 393 | (2,790)
Net income/(loss) allocated to common unitholders — Diluted | $ 831 | $ 393 | $ (2,790)
Weighted Average | Equity-indexed Compensation Plan Award |  |  |
Net Income Per Common Unit |  |  |
Dilutive equity-indexed compensation plan awards (in units) | 2.0 | 0.5 | 0.3
Series A Preferred Units |  |  |
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |
Distributions to preferred unitholders | $ (149) | $ (149) | $ (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) | 71.0 | 71.0 | 71.0
Series B Preferred Units |  |  |
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |
Distributions to preferred unitholders | $ (52) | $ (49) | $ (49)
Common Units |  |  |
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |
Basic weighted average common units outstanding (in units) | 701.0 | 716.0 | 728.0
Diluted weighted average common units outstanding (in units) | 701.0 | 716.0 | 728.0
Basic net income/(loss) per common unit (in dollars per unit) | $ 1.19 | $ 0.55 | $ (3.83)
Diluted net income/(loss) per common unit (in dollars per unit) | $ 1.19 | $ 0.55 | $ (3.83)

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