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Investments (Tables)
 12 Months Ended
Dec. 31, 2012
Investments [Abstract]  
Schedule of earnings from equity investments [Table Text Block]
Our earnings (losses) from equity investments were as follows (in millions):
 
 
Year Ended December 31,
 
2012
 
2011
 
2010
Plantation Pipe Line Company
$
51

 
$
45

 
$
30

Midcontinent Express Pipeline LLC
42

 
43

 
30

Red Cedar Gathering Company
32

 
32

 
29

Cortez Pipeline Company
25

 
24

 
23

Fayetteville Express Pipeline LLC
55

 
24

 
—

El Paso Natural Gas Company, L.L.C.
31

 
—

 
—

KinderHawk Field Services LLC
—

 
22

 
19

Eagle Ford Gathering LLC
34

 
11

 
—

Watco Companies, LLC
13

 
6

 
—

El Paso Midstream Investment Company, LLC
13

 
—

 
—

EagleHawk Field Services LLC
11

 
3

 
—

Express pipeline system
5

 
(2
)
 
(3
)
All others
27

 
16

 
8

Total
$
339

 
$
224

 
$
136

Amortization of excess costs
$
(7
)
 
$
(7
)
 
$
(6
)
Schedule of Equity Method Investments [Table Text Block]
 
December 31,
 
2012
 
2011
El Paso Natural Gas Company, L.L.C.
$
872

 
$
—

Midcontinent Express Pipeline LLC
633

 
667

El Paso Midstream Investment Company, LLC
312

 
—

Plantation Pipe Line Company
181

 
185

Red Cedar Gathering Company
172

 
168

Fayetteville Express Pipeline LLC
159

 
173

EagleHawk Field Services LLC
208

 
141

Eagle Ford Gathering LLC
151

 
117

Watco Companies, LLC
103

 
102

Express pipeline system
—

 
65

Cortez Pipeline Company
11

 
10

Rockies Express Pipeline LLC
—

 
1,595

All others
238

 
115

Total equity investments
3,040

 
3,338

Bond investments
8

 
8

Total investments
$
3,048

 
$
3,346
Summarized financial information of significant equity investments [Table Text Block]
Summarized combined financial information for our significant equity investments (listed or described above) is reported below (in millions; amounts represent 100% of investee financial information):

 
Year Ended December 31,
Income Statement
2012
 
2011
 
2010
Revenues
$
2,842

 
$
2,313

 
$
1,572

Costs and expenses
2,123

 
1,747

 
1,156

Earnings before extraordinary items and cumulative effect of a change in accounting principle
719

 
566

 
416

Net income
$
719

 
$
566

 
$
416


 
December 31,
Balance Sheet
2012
 
2011
Current assets
$
575

 
$
491

Non-current assets
$
9,805

 
$
11,489

Current liabilities
$
1,245

 
$
546

Non-current liabilities
$
3,624

 
$
5,312

Partners’/Owners’ equity
$
5,511

 
$
6,122