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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial data (unaudited)
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total (1)
 
(in millions, except per unit data)
2018
 
 
 
 
 
 
 
 
 
Total revenues
$
8,398

 
$
8,080

 
$
8,792

 
$
8,786

 
$
34,055

Gross margin (2)
$
460

 
$
168

 
$
567

 
$
1,399

 
$
2,593

Operating income
$
381

 
$
88

 
$
493

 
$
1,315

 
$
2,277

Net income
$
288

 
$
100

 
$
710

 
$
1,117

 
$
2,216

Net income attributable to PAA
$
288

 
$
100

 
$
710

 
$
1,117

 
$
2,216

Basic net income per common unit
$
0.33

 
$
0.07

 
$
0.91

 
$
1.46

 
$
2.77

Diluted net income per common unit
$
0.33

 
$
0.07

 
$
0.87

 
$
1.38

 
$
2.71

Cash distributions per common unit (3)
$
0.30

 
$
0.30

 
$
0.30

 
$
0.30

 
$
1.20

 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
Total revenues
$
6,667

 
$
6,078

 
$
5,873

 
$
7,605

 
$
26,223

Gross margin (2)
$
665

 
$
325

 
$
112

 
$
327

 
$
1,429

Operating income
$
591

 
$
257

 
$
44

 
$
261

 
$
1,153

Net income
$
444

 
$
189

 
$
34

 
$
191

 
$
858

Net income attributable to PAA
$
444

 
$
188

 
$
33

 
$
191

 
$
856

Basic net income/(loss) per common unit
$
0.59

 
$
0.21

 
$
(0.01
)
 
$
0.19

 
$
0.96

Diluted net income/(loss) per common unit
$
0.58

 
$
0.21

 
$
(0.01
)
 
$
0.19

 
$
0.95

Cash distributions per common unit (3)
$
0.55

 
$
0.55

 
$
0.55

 
$
0.30

 
$
1.95

 
(1) 
The sum of the four quarters may not equal the total year due to rounding.
(2) 
Gross margin is calculated as Total revenues less (i) Purchases and related costs, (ii) Field operating costs, (iii) Depreciation and amortization and (iv) (Gains)/losses on asset sales and asset impairments, net.
(3) 
Represents cash distributions declared and paid in the period presented.