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Net Income/(Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |  |
Net income/(loss) attributable to PAA | $ 203 | $ (220) | $ 390 | $ 202
Distributions to participating securities | (1) | 0 | (1) |
Net income/(loss) allocated to common unitholders - Basic | 153 | (269) | 290 | 103
Net income/(loss) allocated to common unitholders - Diluted | $ 153 | $ (269) | $ 290 | $ 103
Equity-indexed Compensation Plan Award | Weighted average |  |  |  |
Net Income/(Loss) Per Common Unit |  |  |  |
Antidilutive securities excluded from computation of net income per common unit (units) |  | 0.7 |  |
Dilutive equity-indexed compensation plan awards (units) | 0.8 |  | 0.7 | 0.4
Series A Preferred Units |  |  |  |
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (37) | $ (37) | $ (74) | $ (74)
Series A Preferred Units | Weighted average |  |  |  |
Net Income/(Loss) Per Common Unit |  |  |  |
Antidilutive securities excluded from computation of net income per common unit (units) | 71.0 | 71.0 | 71.0 | 71.0
Series B Preferred Units |  |  |  |
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (12) | $ (12) | $ (25) | $ (25)
Common Units |  |  |  |
Basic and Diluted Net Income/(Loss) per Common Unit |  |  |  |
Basic weighted average common units outstanding (units) | 702.0 | 720.0 | 703.0 | 721.0
Diluted weighted average common units outstanding (units) | 702.0 | 720.0 | 703.0 | 721.0
Basic net income/(loss) per common unit (usd per unit) | $ 0.22 | $ (0.37) | $ 0.41 | $ 0.14
Diluted net income/(loss) per common unit (usd per unit) | $ 0.22 | $ (0.37) | $ 0.41 | $ 0.14

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