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Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Basic Net Income per Common Unit |  |  |  |
Net income attributable to PAA | $ 100 | $ 188 | $ 388 | $ 632
Distributions to participating securities | (1) | (1) | (2) | (1)
Other |  | (4) | (1) | (7)
Net income allocated to common unitholders | 50 | 148 | 286 | 555
Diluted Net Income per Common Unit |  |  |  |
Net income attributable to PAA | 100 | 188 | 388 | 632
Distributions to participating securities | (1) | (1) | (2) | (1)
Other |  | (4) | (1) | (7)
Net income allocated to common unitholders | $ 50 | $ 148 | $ 286 | $ 555
Effect of dilutive securities: |  |  |  |
Equity-indexed compensation plan awards (units) | 2 | 2 | 2 | 2
Series A Preferred Units |  |  |  |
Basic Net Income per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (37) | $ (35) | $ (74) | $ (69)
Diluted Net Income per Common Unit |  |  |  |
Distributions to preferred unitholders | (37) | $ (35) | (74) | $ (69)
Series B Preferred Units |  |  |  |
Basic Net Income per Common Unit |  |  |  |
Distributions to preferred unitholders | (12) |  | (25) |
Diluted Net Income per Common Unit |  |  |  |
Distributions to preferred unitholders | $ (12) |  | $ (25) |
Common Units |  |  |  |
Basic Net Income per Common Unit |  |  |  |
Basic weighted average common units outstanding (units) | 725 | 725 | 725 | 708
Basic net income per common unit (usd per unit) | $ 0.07 | $ 0.21 | $ 0.39 | $ 0.78
Diluted Net Income per Common Unit |  |  |  |
Basic weighted average common units outstanding (units) | 725 | 725 | 725 | 708
Effect of dilutive securities: |  |  |  |
Diluted weighted average common units outstanding (units) | 727 | 727 | 727 | 710
Diluted net income per common unit (usd per unit) | $ 0.07 | $ 0.21 | $ 0.39 | $ 0.78

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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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