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Net Income Per Common Unit (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
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,
 
2019
 
2018
 
2019
 
2018
Basic Net Income per Common Unit
 

 
 

 
 

 
 

Net income attributable to PAA
$
449

 
$
710

 
$
1,865

 
$
1,099

Distributions to Series A preferred unitholders
(37
)
 
(37
)
 
(112
)
 
(112
)
Distributions to Series B preferred unitholders
(12
)
 
(12
)
 
(37
)
 
(37
)
Distributions to participating securities
(1
)
 
(1
)
 
(2
)
 
(2
)
Other
—

 
(2
)
 
(4
)
 
(2
)
Net income allocated to common unitholders (1)
$
399

 
$
658

 
$
1,710

 
$
946

 
 
 
 
 
 
 
 
Basic weighted average common units outstanding
728

 
726

 
727

 
726

 
 
 
 
 
 
 
 
Basic net income per common unit
$
0.55

 
$
0.91

 
$
2.35

 
$
1.30

 
 
 
 
 
 
 
 
Diluted Net Income per Common Unit
 

 
 

 
 

 
 

Net income attributable to PAA
$
449

 
$
710

 
$
1,865

 
$
1,099

Distributions to Series A preferred unitholders
—

 
—

 
—

 
(112
)
Distributions to Series B preferred unitholders
(12
)
 
(12
)
 
(37
)
 
(37
)
Distributions to participating securities
(1
)
 
(1
)
 
(2
)
 
(2
)
Other
—

 
—

 
—

 
(1
)
Net income allocated to common unitholders (1)
$
436

 
$
697

 
$
1,826

 
$
947

 
 
 
 
 
 
 
 
Basic weighted average common units outstanding
728

 
726

 
727

 
726

Effect of dilutive securities:
 
 
 
 
 
 
 
Series A preferred units
71

 
71

 
71

 
—

Equity-indexed compensation plan awards
1

 
2

 
2

 
2

Diluted weighted average common units outstanding
800

 
799

 
800

 
728

 
 
 
 
 
 
 
 
Diluted net income per common unit
$
0.55

 
$
0.87

 
$
2.28

 
$
1.30

 
(1) 
We calculate net income allocated to common unitholders based on the distributions pertaining to the current period’s net income (whether paid in cash or in-kind). After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to 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.