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Net Income Per Common Unit (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Computation of basic and diluted net income per common unit | The following table sets forth the computation of basic and diluted net income/(loss) per common unit (in millions, except per unit data):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Basic Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAA | $ | 188 |  |  | $ | 101 |  |  | 632 |  |  | 302 |
Distributions to Series A preferred units (1) | (35 | ) |  | (33 | ) |  | (69 | ) |  | (55 | )
Distributions to general partner (1) | — |  |  | (155 | ) |  | — |  |  | (310 | )
Distributions to participating securities (1) | (1 | ) |  | (1 | ) |  | (1 | ) |  | (2 | )
Undistributed loss allocated to general partner (1) | — |  |  | 7 |  |  | — |  |  | 12 |
Other | (4 | ) |  | — |  |  | (7 | ) |  | — |
Net income/(loss) allocated to common unitholders | $ | 148 |  |  | $ | (81 | ) |  | $ | 555 |  |  | $ | (53 | )
Basic weighted average common units outstanding | 725 |  |  | 398 |  |  | 708 |  |  | 398 |
Basic net income/(loss) per common unit | $ | 0.21 |  |  | $ | (0.20 | ) |  | $ | 0.78 |  |  | $ | (0.13 | )
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAA | $ | 188 |  |  | $ | 101 |  |  | $ | 632 |  |  | $ | 302 |
Distributions to Series A preferred units (1) | (35 | ) |  | (33 | ) |  | (69 | ) |  | (55 | )
Distributions to general partner (1) | — |  |  | (155 | ) |  | — |  |  | (310 | )
Distributions to participating securities (1) | (1 | ) |  | (1 | ) |  | (1 | ) |  | (2 | )
Undistributed loss allocated to general partner (1) | — |  |  | 7 |  |  | — |  |  | 12 |
Other | (4 | ) |  | — |  |  | (7 | ) |  | — |
Net income/(loss) allocated to common unitholders | $ | 148 |  |  | $ | (81 | ) |  | $ | 555 |  |  | $ | (53 | )
Basic weighted average common units outstanding | 725 |  |  | 398 |  |  | 708 |  |  | 398 |
Effect of dilutive securities: |  |  |  |  |  |  |
LTIP units | 2 |  |  | — |  |  | 2 |  |  | — |
Diluted weighted average common units outstanding | 727 |  |  | 398 |  |  | 710 |  |  | 398 |
Diluted net income/(loss) per common unit | $ | 0.21 |  |  | $ | (0.20 | ) |  | $ | 0.78 |  |  | $ | (0.13 | )
(1) | We calculate net income/(loss) 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 (“undistributed loss”), if any, are allocated to the general partner, common unitholders and participating securities in accordance with the contractual terms of our partnership agreement in effect for the period and as further prescribed under the two-class method. The Simplification Transactions, which closed on November 15, 2016, simplified our governance structure and permanently eliminated our IDRs and the economic rights associated with our 2% general partner interest. Therefore, beginning with the distribution pertaining to the fourth quarter of 2016, our general partner is no longer entitled to receive distributions or allocations on such interests.

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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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