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Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended | 22 Months Ended
--- | --- | --- | --- | ---
Nov. 15, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 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 |  | $ 1,117 | $ 710 | $ 100 | $ 288 | $ 191 | $ 33 | $ 188 | $ 444 | $ 2,216 | $ 856 | $ 726 |
Distributions to general partner |  |  |  |  |  |  |  |  |  |  |  | (412) |
Distributions to participating securities |  |  |  |  |  |  |  |  |  | (3) | (2) | (4) |
Undistributed loss allocated to general partner |  |  |  |  |  |  |  |  |  |  |  | 14 |
Other |  |  |  |  |  |  |  |  |  | (6) | (16) | (2) |
Net income allocated to common unitholders |  |  |  |  |  |  |  |  |  | 2,009 | 685 | 200 |
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAA |  | $ 1,117 | $ 710 | $ 100 | $ 288 | $ 191 | $ 33 | $ 188 | $ 444 | 2,216 | 856 | 726 |
Distributions to general partner |  |  |  |  |  |  |  |  |  |  |  | (412) |
Distributions to participating securities |  |  |  |  |  |  |  |  |  | (3) | (2) | (4) |
Undistributed loss allocated to general partner |  |  |  |  |  |  |  |  |  |  |  | 14 |
Other |  |  |  |  |  |  |  |  |  |  | (16) | (2) |
Net income allocated to common unitholders |  |  |  |  |  |  |  |  |  | 2,164 | 685 | 200 |
Series A Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |
Basic Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to preferred unitholders |  |  |  |  |  |  |  |  |  | (149) | (142) | (122) |
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to preferred unitholders |  |  |  |  |  |  |  |  |  |  | (142) | $ (122) |
Series B Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |
Basic Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to preferred unitholders |  |  |  |  |  |  |  |  |  | (49) | (11) |  |
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to preferred unitholders |  |  |  |  |  |  |  |  |  | $ (49) | $ (11) |  |
Common Units |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income Per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment, Series A Preferred Units |  |  |  |  |  |  |  |  |  | 71 |  | 0 |
Basic Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common units outstanding (in units) |  |  |  |  |  |  |  |  |  | 726 | 717 | 464 |
Basic net income per common unit (in dollars per unit) |  | $ 1.46 | $ 0.91 | $ 0.07 | $ 0.33 | $ 0.19 | $ (0.01) | $ 0.21 | $ 0.59 | $ 2.77 | $ 0.96 | $ 0.43 |
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common units outstanding (in units) |  |  |  |  |  |  |  |  |  | 726 | 717 | 464 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-indexed compensation plan awards (in units) |  |  |  |  |  |  |  |  |  | 2 | 1 | 2 |
Diluted weighted average common units outstanding (in units) |  |  |  |  |  |  |  |  |  | 799 | 718 | 466 |
Diluted net income per common unit (in dollars per unit) |  | $ 1.38 | $ 0.87 | $ 0.07 | $ 0.33 | $ 0.19 | $ (0.01) | $ 0.21 | $ 0.58 | $ 2.71 | $ 0.95 | $ 0.43 |
Simplification Transactions | PAA GP |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income Per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Economic ownership interest converted into non-economic interest | 2.00% |  |  |  |  |  |  |  |  |  |  |  |

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