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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Basic Net Income per Common Unit |  |  |  |
Net income attributable to PAA | $ 101 | $ 124 | $ 302 | $ 407
Distributions to Series A preferred units | (33) |  | (55) |
Distributions to general partner | (155) | (152) | (310) | (300)
Distributions to participating securities | (1) | (1) | (2) | (3)
Undistributed loss allocated to general partner | 7 | 6 | 12 | 9
Net income/(loss) allocated to common unitholders in accordance with application of the two-class method for MLPs | (81) | (23) | (53) | 113
Diluted Net Income per Common Unit |  |  |  |
Net income attributable to PAA | 101 | 124 | 302 | 407
Distributions to Series A preferred units | (33) |  | (55) |
Distributions to general partner | (155) | (152) | (310) | (300)
Distributions to participating securities | (1) | (1) | (2) | (3)
Undistributed loss allocated to general partner | 7 | 6 | 12 | 9
Net income/(loss) allocated to common unitholders in accordance with application of the two-class method for MLPs | $ (81) | $ (23) | $ (53) | $ 113
Common Units |  |  |  |
Basic Net Income per Common Unit |  |  |  |
Basic weighted average common units outstanding | 398 | 397 | 398 | 390
Basic net income/(loss) per common unit (in dollars per unit) | $ (0.20) | $ (0.06) | $ (0.13) | $ 0.29
Diluted Net Income per Common Unit |  |  |  |
Basic weighted average common units outstanding | 398 | 397 | 398 | 390
Effect of dilutive securities: Weighted average LTIP units |  |  |  | 3
Diluted weighted average common units outstanding | 398 | 397 | 398 | 393
Diluted net income/(loss) per common unit (in dollars per unit) | $ (0.20) | $ (0.06) | $ (0.13) | $ 0.29

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