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Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Basic Net Income per Common Unit |  |
Net income attributable to PAA | $ 202 | $ 283
Less: Distributions to Series A Preferred Units | (23) |
Less: Distributions to general partner | (155) | (148)
Less: Distributions to participating securities | (1) | (2)
Less: Undistributed loss allocated to general partner | 5 | 3
Net income attributable to common unitholders in accordance with application of the two-class method for MLPs | 28 | 136
Diluted Net Income per Common Unit |  |
Net income attributable to PAA | 202 | 283
Less: Distributions to Series A Preferred Units | (23) |
Less: Distributions to general partner | (155) | (148)
Less: Distributions to participating securities | (1) | (2)
Less: Undistributed loss allocated to general partner | 5 | 3
Net income attributable to common unitholders in accordance with application of the two-class method for MLPs | $ 28 | $ 136
Common Units |  |
Basic Net Income per Common Unit |  |
Basic weighted average common units outstanding (in units) | 398 | 383
Basic net income per common unit (in dollars per unit) | $ 0.07 | $ 0.36
Diluted Net Income per Common Unit |  |
Basic weighted average common units outstanding (in units) | 398 | 383
Effect of dilutive securities: Weighted average LTIP units | 1 | 2
Diluted weighted average common units outstanding | 399 | 385
Diluted net income per common unit (in dollars per unit) | $ 0.07 | $ 0.35

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