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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
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic Net Income per Common Unit                      
Net income attributable to PAA $ 306 $ 449 $ 446 $ 970 $ 1,117 $ 710 $ 100 $ 288 $ 2,171 $ 2,216 $ 856
Distributions to participating securities                 (3) (3) (2)
Other                 (3) (6) (16)
Net income allocated to common unitholders                 1,967 2,009 685
Diluted Net Income per Common Unit                      
Net income attributable to PAA $ 306 $ 449 $ 446 $ 970 $ 1,117 $ 710 $ 100 $ 288 2,171 2,216 856
Distributions to participating securities                 (3) (3) (2)
Other                     (16)
Net income allocated to common unitholders                 2,119 2,164 685
Series A Preferred Units                      
Basic Net Income per Common Unit                      
Distributions to preferred unitholders                 (149) (149) (142)
Diluted Net Income per Common Unit                      
Distributions to preferred unitholders                     (142)
Series B Preferred Units                      
Basic Net Income per Common Unit                      
Distributions to preferred unitholders                 (49) (49) (11)
Diluted Net Income per Common Unit                      
Distributions to preferred unitholders                 $ (49) $ (49) $ (11)
Common Units                      
Basic Net Income per Common Unit                      
Basic weighted average common units outstanding (in units)                 727 726 717
Basic net income per common unit (in dollars per unit) $ 0.35 $ 0.55 $ 0.54 $ 1.26 $ 1.46 $ 0.91 $ 0.07 $ 0.33 $ 2.70 $ 2.77 $ 0.96
Diluted Net Income per Common Unit                      
Basic weighted average common units outstanding (in units)                 727 726 717
Effect of dilutive securities:                      
Series A preferred units (in units)                 71 71  
Equity-indexed compensation plan awards (in units)                 2 2 1
Diluted weighted average common units outstanding (in units)                 800 799 718
Diluted net income per common unit (in dollars per unit) $ 0.35 $ 0.55 $ 0.54 $ 1.20 $ 1.38 $ 0.87 $ 0.07 $ 0.33 $ 2.65 $ 2.71 $ 0.95