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Net Income/(Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Basic Net Income/(Loss) per Common Unit |  |  |  |
Net income/(loss) attributable to PAA | $ 143 | $ 449 | $ (2,562) | $ 1,865
Distributions to participating securities | (1) | (1) | (1) | (2)
Other | 0 | 0 | 0 | (4)
Net income/(loss) allocated to common unitholders | 93 | 399 | (2,712) | 1,710
Diluted Net Income/(Loss) per Common Unit |  |  |  |
Net income/(loss) attributable to PAA | 143 | 449 | (2,562) | 1,865
Distributions to participating securities | (1) | (1) | (1) | (2)
Net income/(loss) allocated to common unitholders | $ 93 | 436 | $ (2,712) | 1,826
Equity-indexed Compensation Plan Award |  |  |  |
Effect of dilutive securities: |  |  |  |
Equity-indexed compensation plan awards (units) | 0 |  |  |
Equity-indexed Compensation Plan Award | Weighted average |  |  |  |
Net Income/(Loss) Per Common Unit |  |  |  |
Antidilutive securities excluded from computation of earnings per unit (units) |  |  | 400,000 |
Series A Preferred Units |  |  |  |
Basic Net Income/(Loss) per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (37) | (37) | $ (112) | (112)
Diluted Net Income/(Loss) per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (37) | 0 | $ (112) | 0
Series A Preferred Units | Weighted average |  |  |  |
Net Income/(Loss) Per Common Unit |  |  |  |
Antidilutive securities excluded from computation of earnings per unit (units) | 71,000,000 |  | 71,000,000 |
Series B Preferred Units |  |  |  |
Basic Net Income/(Loss) per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (12) | (12) | $ (37) | (37)
Diluted Net Income/(Loss) per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (12) | $ (12) | $ (37) | $ (37)
Common Units |  |  |  |
Basic Net Income/(Loss) per Common Unit |  |  |  |
Basic weighted average common units outstanding (units) | 728,000,000 | 728,000,000 | 728,000,000 | 727,000,000
Basic net income/(loss) per common unit (usd per unit) | $ 0.13 | $ 0.55 | $ (3.72) | $ 2.35
Diluted Net Income/(Loss) per Common Unit |  |  |  |
Basic weighted average common units outstanding (units) | 728,000,000 | 728,000,000 | 728,000,000 | 727,000,000
Effect of dilutive securities: |  |  |  |
Series A preferred units (units) | 0 | 71,000,000 | 0 | 71,000,000
Equity-indexed compensation plan awards (units) | 0 | 1,000,000 | 0 | 2,000,000
Diluted weighted average common units outstanding (units) | 728,000,000 | 800,000,000 | 728,000,000 | 800,000,000
Diluted net income/(loss) per common unit (usd per unit) | $ 0.13 | $ 0.55 | $ (3.72) | $ 2.28

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