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Net Income Per Common Unit (Tables)
 6 Months Ended
Jun. 30, 2018
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
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Basic Net Income per Common Unit
 

 
 

 
 

 
 

Net income attributable to PAA
$
100

 
$
188

 
388

 
632

Distributions to Series A preferred unitholders
(37
)
 
(35
)
 
(74
)
 
(69
)
Distributions to Series B preferred unitholders
(12
)
 
—

 
(25
)
 
—

Distributions to participating securities
(1
)
 
(1
)
 
(2
)
 
(1
)
Other
—

 
(4
)
 
(1
)
 
(7
)
Net income allocated to common unitholders (1)
$
50

 
$
148

 
$
286

 
$
555

 
 
 
 
 
 
 
 
Basic weighted average common units outstanding
725

 
725

 
725

 
708

 
 
 
 
 
 
 
 
Basic net income per common unit
$
0.07

 
$
0.21

 
$
0.39

 
$
0.78

 
 
 
 
 
 
 
 
Diluted Net Income per Common Unit
 

 
 

 
 

 
 

Net income attributable to PAA
$
100

 
$
188

 
$
388

 
$
632

Distributions to Series A preferred unitholders
(37
)
 
(35
)
 
(74
)
 
(69
)
Distributions to Series B preferred unitholders
(12
)
 
—

 
(25
)
 
—

Distributions to participating securities
(1
)
 
(1
)
 
(2
)
 
(1
)
Other
—

 
(4
)
 
(1
)
 
(7
)
Net income allocated to common unitholders (1)
$
50

 
$
148

 
$
286

 
$
555

 
 
 
 
 
 
 
 
Basic weighted average common units outstanding
725

 
725

 
725

 
708

Effect of dilutive securities:
 
 
 
 
 
 
 
Equity-indexed compensation plan awards
2

 
2

 
2

 
2

Diluted weighted average common units outstanding
727

 
727

 
727

 
710

 
 
 
 
 
 
 
 
Diluted net income per common unit
$
0.07

 
$
0.21

 
$
0.39

 
$
0.78

 
(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.