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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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)
2016
 
 
 
 
 
 
 
 
 
Total revenues
$
4,111

 
$
4,950

 
$
5,170

 
$
5,952

 
$
20,182

Gross margin (2)
$
349

 
$
219

 
$
419

 
$
286

 
$
1,273

Operating income
$
282

 
$
146

 
$
349

 
$
218

 
$
994

Net income
$
203

 
$
102

 
$
298

 
$
127

 
$
730

Net income attributable to PAA
$
202

 
$
101

 
$
297

 
$
126

 
$
726

Basic net income/(loss) per common unit
$
0.07

 
$
(0.20
)
 
$
0.40

 
$
0.14

 
$
0.43

Diluted net income/(loss) per common unit
$
0.07

 
$
(0.20
)
 
$
0.40

 
$
0.14

 
$
0.43

Cash distributions per common unit (3)
$
0.70

 
$
0.70

 
$
0.70

 
$
0.55

 
$
2.65

 
 
 
 
 
 
 
 
 
 
2015
 
 
 
 
 
 
 
 
 
Total revenues
$
5,942

 
$
6,663

 
$
5,551

 
$
4,996

 
$
23,152

Gross margin (2)
$
450

 
$
290

 
$
395

 
$
405

 
$
1,540

Operating income
$
372

 
$
211

 
$
335

 
$
344

 
$
1,262

Net income
$
284

 
$
124

 
$
250

 
$
248

 
$
906

Net income attributable to PAA
$
283

 
$
124

 
$
249

 
$
247

 
$
903

Basic net income/(loss) per common unit
$
0.36

 
$
(0.06
)
 
$
0.25

 
$
0.24

 
$
0.78

Diluted net income/(loss) per common unit
$
0.35

 
$
(0.06
)
 
$
0.24

 
$
0.24

 
$
0.77

Cash distributions per common unit (3)
$
0.68

 
$
0.69

 
$
0.70

 
$
0.70

 
$
2.76

 
(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 and (iii) Depreciation and amortization.
(3) 
Represents cash distributions declared and paid in the period presented.