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Net Income Per Common Unit (Tables) | 6 Months Ended
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Jun. 30, 2016
Net Income Per Common Unit |
Computation of basic and diluted net income per common unit | The following table sets forth the computation of basic and diluted net income per common unit (in millions, except per unit data):
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Basic Net Income per Common Unit |  |  |  |  |  |  |  |  |
Net income attributable to PAA |  | $ | 101 |  | $ | 124 |  | $ | 302 |  | $ | 407 |
Distributions to Series A preferred units (1) |  | (33 | ) | — |  | (55 | ) | — |
Distributions to general partner (1) |  | (155 | ) | (152 | ) | (310 | ) | (300 | )
Distributions to participating securities (1) |  | (1 | ) | (1 | ) | (2 | ) | (3 | )
Undistributed loss allocated to general partner (1) |  | 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 |
Basic weighted average common units outstanding |  | 398 |  | 397 |  | 398 |  | 390 |
Basic net income/(loss) per common unit |  | $ | (0.20 | ) | $ | (0.06 | ) | $ | (0.13 | ) | $ | 0.29 |
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |
Net income attributable to PAA |  | $ | 101 |  | $ | 124 |  | $ | 302 |  | $ | 407 |
Distributions to Series A preferred units (1) |  | (33 | ) | — |  | (55 | ) | — |
Distributions to general partner (1) |  | (155 | ) | (152 | ) | (310 | ) | (300 | )
Distributions to participating securities (1) |  | (1 | ) | (1 | ) | (2 | ) | (3 | )
Undistributed loss allocated to general partner (1) |  | 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 |
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 |  | $ | (0.20 | ) | $ | (0.06 | ) | $ | (0.13 | ) | $ | 0.29 |
| (1) |  | We calculate net income allocated to common unitholders based on the distributions pertaining to the current period’s net income. After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to the general partner, common unitholders and participating securities in accordance with the contractual terms of our partnership agreement and as further prescribed under the two-class method.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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