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Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 15, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Nov. 14, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
General partner ownership interest |  |  |  |  |  |  |  |  |  | 2.00% |  |  |
Basic Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAA |  | $ 126 | $ 297 | $ 101 | $ 202 | $ 247 | $ 249 | $ 124 | $ 283 |  | $ 726 | $ 903 | $ 1,384
Distributions to Series A preferred units |  |  |  |  |  |  |  |  |  |  | (122) | 0 | 0
Distributions to general partner |  |  |  |  |  |  |  |  |  |  | (412) | (608) | (502)
Distributions to participating securities |  |  |  |  |  |  |  |  |  |  | (4) | (6) | (6)
Undistributed loss allocated to general partner |  |  |  |  |  |  |  |  |  |  | 14 | 16 | 2
Other |  |  |  |  |  |  |  |  |  |  | (2) | 0 | 0
Net income allocated to common unitholders in accordance with application of the two-class method |  |  |  |  |  |  |  |  |  |  | $ 200 | $ 305 | 878
Basic net income/(loss) per common unit (in dollars per unit) |  | $ 0.14 | $ 0.40 | $ (0.20) | $ 0.07 | $ 0.24 | $ 0.25 | $ (0.06) | $ 0.36 |  | $ 0.43 | $ 0.78 |
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAA |  | $ 126 | $ 297 | $ 101 | $ 202 | $ 247 | $ 249 | $ 124 | $ 283 |  | $ 726 | $ 903 | 1,384
Distributions to Series A preferred units |  |  |  |  |  |  |  |  |  |  | (122) | 0 | 0
Distributions to general partner |  |  |  |  |  |  |  |  |  |  | (412) | (608) | (502)
Distributions to participating securities |  |  |  |  |  |  |  |  |  |  | (4) | (6) | (6)
Undistributed loss allocated to general partner |  |  |  |  |  |  |  |  |  |  | 14 | 16 | 2
Other |  |  |  |  |  |  |  |  |  |  | (2) | 0 | 0
Net income attributable to common unitholders in accordance with application of the two-class method |  |  |  |  |  |  |  |  |  |  | $ 200 | $ 305 | $ 878
Diluted net income per common unit (in dollars per unit) |  | $ 0.14 | $ 0.40 | $ (0.20) | $ 0.07 | $ 0.24 | $ 0.24 | $ (0.06) | $ 0.35 |  | $ 0.43 | $ 0.77 |
Common Units |  |  |  |  |  |  |  |  |  |  |  |  |
Basic Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common units outstanding (in units) |  |  |  |  |  |  |  |  |  |  | 464.0 | 394.0 | 367.0
Basic net income/(loss) per common unit (in dollars per unit) |  |  |  |  |  |  |  |  |  |  | $ 0.43 | $ 0.78 | $ 2.39
Diluted Net Income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common units outstanding (in units) |  |  |  |  |  |  |  |  |  |  | 464.0 | 394.0 | 367.0
Effect of dilutive securities: Weighted average LTIP units (in units) |  |  |  |  |  |  |  |  |  |  | 2.0 | 2.0 | 2.0
Diluted weighted average common units outstanding (in units) |  |  |  |  |  |  |  |  |  |  | 466.0 | 396.0 | 369.0
Diluted net income per common unit (in dollars per unit) |  |  |  |  |  |  |  |  |  |  | $ 0.43 | $ 0.77 | $ 2.38
Simplification Agreement | PAA GP |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
General Partner Economic Ownership Interest Converted Into Non-economic Interest | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Simplification Agreement | AAP |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units in connection with Simplification Transactions (in units) | 244.7 |  |  |  |  |  |  |  |  |  |  |  |
Units to be issued in the future (in units) | 0.8 |  |  |  |  |  |  |  |  |  |  |  |

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