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Net Income Per Common Unit (Tables)
12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Schedule of 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,
202420232022
Basic and Diluted Net Income per Common Unit
Net income attributable to PAA$772 $1,230 $1,037 
Distributions to Series A preferred unitholders (175)(173)(149)
Distributions to Series B preferred unitholders(78)(76)(52)
Amounts allocated to participating securities (10)(10)(5)
Other— 
Net income allocated to common unitholders (1)
$514 $976 $831 
Basic and diluted weighted average common units outstanding702 699 701 
Basic and diluted net income per common unit$0.73 $1.40 $1.19 
(1)We calculate net income allocated to common unitholders based on the distributions pertaining to the current period’s net income. 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.