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Net Income Per Common Unit (Tables)
 9 Months Ended
Sep. 30, 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):

 Three Months Ended
September 30,		Nine Months Ended
September 30,
 2024202320242023
Basic and Diluted Net Income per Common Unit    
Net income attributable to PAA$220 $203 $736 $918 
Distributions to Series A preferred unitholders
(44)(44)(131)(129)
Distributions to Series B preferred unitholders
(19)(19)(59)(56)
Amounts allocated to participating securities(1)(1)(9)(8)
Other
1 1 3 3 
Net income allocated to common unitholders (1)
$157 $140 $540 $728 
Basic and diluted weighted average common units outstanding702 700 702 699 
Basic and diluted net income per common unit$0.22 $0.20 $0.77 $1.04 
(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.