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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 | 10 Months Ended
--- | --- | --- | --- | ---
Nov. 15, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Nov. 14, 2016
Net Income Per Common Unit |  |  |  |  |  |
General partner ownership interest |  |  |  |  |  | 2.00%
Basic Net Income per Common Unit |  |  |  |  |  |
Net income attributable to PAA |  | $ 188 | $ 101 | $ 632 | $ 302 |
Distributions to Series A preferred units |  | (35) | (33) | (69) | (55) |
Distributions to general partner |  |  | (155) |  | (310) |
Distributions to participating securities |  | (1) | (1) | (1) | (2) |
Undistributed loss allocated to general partner |  |  | 7 |  | 12 |
Other |  | (4) |  | (7) |  |
Net income/(loss) allocated to common unitholders |  | 148 | (81) | 555 | (53) |
Diluted Net Income per Common Unit |  |  |  |  |  |
Net income attributable to PAA |  | 188 | 101 | 632 | 302 |
Distributions to Series A preferred units |  | (35) | (33) | (69) | (55) |
Distributions to general partner |  |  | (155) |  | (310) |
Distributions to participating securities |  | (1) | (1) | (1) | (2) |
Undistributed loss allocated to general partner |  |  | 7 |  | 12 |
Other |  | (4) |  | (7) |  |
Net income/(loss) allocated to common unitholders |  | $ 148 | $ (81) | $ 555 | $ (53) |
Common Units |  |  |  |  |  |
Basic Net Income per Common Unit |  |  |  |  |  |
Basic weighted average common units outstanding (units) |  | 725 | 398 | 708 | 398 |
Basic net income/(loss) per common unit (usd per unit) |  | $ 0.21 | $ (0.20) | $ 0.78 | $ (0.13) |
Diluted Net Income per Common Unit |  |  |  |  |  |
Basic weighted average common units outstanding (units) |  | 725 | 398 | 708 | 398 |
Effect of dilutive securities: |  |  |  |  |  |
LTIP units (units) |  | 2 |  | 2 |  |
Diluted weighted average common units outstanding (units) |  | 727 | 398 | 710 | 398 |
Diluted net income/(loss) per common unit (usd per unit) |  | $ 0.21 | $ (0.20) | $ 0.78 | $ (0.13) |
Simplification Transactions | PAA GP |  |  |  |  |  |
Net Income Per Common Unit |  |  |  |  |  |
Economic general partner interest converted into non-economic interest | 2.00% |  |  |  |  |

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