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Net Income/(Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Basic Net Income/(Loss) per Common Unit |  |
Net income/(loss) attributable to PAA | $ (2,847) | $ 970
Distributions to participating securities | (1) | (1)
Other |  | (3)
Net income/(loss) allocated to common unitholders | (2,897) | 917
Diluted Net Income/(Loss) per Common Unit |  |
Net income/(loss) attributable to PAA | (2,847) | 970
Distributions to participating securities | (1) | (1)
Net income/(loss) allocated to common unitholders | $ (2,897) | 957
LTIP |  |
Net Income/(Loss) Per Common Unit |  |
Antidilutive securities excluded from computation of earnings per share (per share) | 1 |
Series A Preferred Units |  |
Net Income/(Loss) Per Common Unit |  |
Antidilutive securities excluded from computation of earnings per share (per share) | 71 |
Basic Net Income/(Loss) per Common Unit |  |
Distributions to preferred unitholders | $ (37) | (37)
Diluted Net Income/(Loss) per Common Unit |  |
Distributions to preferred unitholders | (37) |
Series B Preferred Units |  |
Basic Net Income/(Loss) per Common Unit |  |
Distributions to preferred unitholders | (12) | (12)
Diluted Net Income/(Loss) per Common Unit |  |
Distributions to preferred unitholders | $ (12) | $ (12)
Common Units |  |
Basic Net Income/(Loss) per Common Unit |  |
Basic weighted average common units outstanding (units) | 728 | 727
Basic net income/(loss) per common unit (usd per unit) | $ (3.98) | $ 1.26
Diluted Net Income/(Loss) per Common Unit |  |
Basic weighted average common units outstanding (units) | 728 | 727
Effect of dilutive securities: |  |
Series A preferred units (units) |  | 71
Equity-indexed compensation plan awards (units) |  | 2
Diluted weighted average common units outstanding (units) | 728 | 800
Diluted net income/(loss) per common unit (usd per unit) | $ (3.98) | $ 1.20

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- Definition This element represents the net income (loss) allocated to common unitholders in the calculation of basic net income per common unit after deducting amounts allocated to preferred unitholders, participating securities and the 2% general partner's interest, as applicable, under the two class method. + References No definition available. + Details
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