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Net Income Per Common Unit (Tables) | 12 Months Ended
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Dec. 31, 2019
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 per common unit (in millions, except per unit data):
| Year Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Basic Net Income per Common Unit |  |  |  |  |
Net income attributable to PAA | $ | 2,171 |  |  | $ | 2,216 |  |  | $ | 856 |
Distributions to Series A preferred unitholders | (149) |  |  | (149) |  |  | (142) |
Distributions to Series B preferred unitholders | (49) |  |  | (49) |  |  | (11) |
Distributions to participating securities | (3) |  |  | (3) |  |  | (2) |
Other | (3) |  |  | (6) |  |  | (16) |
Net income allocated to common unitholders (1) | $ | 1,967 |  |  | $ | 2,009 |  |  | $ | 685 |
Basic weighted average common units outstanding | 727 |  |  | 726 |  |  | 717 |
Basic net income per common unit | $ | 2.70 |  |  | $ | 2.77 |  |  | $ | 0.96 |
Diluted Net Income per Common Unit |  |  |  |  |
Net income attributable to PAA | $ | 2,171 |  |  | $ | 2,216 |  |  | $ | 856 |
Distributions to Series A preferred unitholders | — |  |  | — |  |  | (142) |
Distributions to Series B preferred unitholders | (49) |  |  | (49) |  |  | (11) |
Distributions to participating securities | (3) |  |  | (3) |  |  | (2) |
Other | — |  |  | — |  |  | (16) |
Net income allocated to common unitholders (1) | $ | 2,119 |  |  | $ | 2,164 |  |  | $ | 685 |
Basic weighted average common units outstanding | 727 |  |  | 726 |  |  | 717 |
Effect of dilutive securities: |  |  |  |  |
Series A preferred units | 71 |  |  | 71 |  |  | — |
Equity-indexed compensation plan awards | 2 |  |  | 2 |  |  | 1 |
Diluted weighted average common units outstanding | 800 |  |  | 799 |  |  | 718 |
Diluted net income per common unit | $ | 2.65 |  |  | $ | 2.71 |  |  | $ | 0.95 |
(1)We calculate net income allocated to common unitholders based on the distributions pertaining to the current period’s net income (whether paid in cash or in-kind). After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings (i.e., undistributed loss), if any, are allocated to the 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.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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