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Investments Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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,
 
2017
 
2016
 
2015
Citrus Corporation
$
108

 
$
102

 
$
96

SNG
77

 
58

 
—

FEP
53

 
51

 
55

Gulf LNG Holdings Group, LLC
47

 
48

 
49

Plantation Pipe Line Company
46

 
37

 
29

Cortez Pipeline Company(a)
44

 
24

 
(3
)
Ruby
44

 
15

 
18

MEP
38

 
40

 
45

EagleHawk
24

 
10

 
24

Watco Companies, LLC
19

 
25

 
16

Red Cedar Gathering Company(b)
14

 
24

 
26

Fort Union Gas Gathering L.L.C.(c)
10

 
1

 
16

NGPL Holdings LLC
10

 
12

 
—

Liberty Pipeline Group LLC
9

 
11

 
9

Bear Creek Storage
8

 
2

 
—

Sierrita Gas Pipeline LLC
7

 
7

 
9

Double Eagle Pipeline LLC
7

 
5

 
3

Parkway Pipeline LLC
—

 
14

 
5

All others
13

 
11

 
17

Total earnings from equity investments
$
578


$
497

 
$
414

Amortization of excess costs
(61
)
 
(59
)
 
(51
)
_______
(a)
2017, 2016 and 2015 amounts include $(4) million, $9 million and $26 million, respectively, representing our share of a non-cash impairment charge (pre-tax) recorded by Cortez Pipeline Company.
(b)
2017 amount includes non-cash impairment charges of $10 million (pre-tax) related to our investment.
(c)
2016 amount includes non-cash impairment charges of $7 million (pre-tax) related to our investment.

  
Schedule of Equity Method Investments [Table Text Block]
Our investments primarily consist of equity investments where we hold significant influence over investee actions and for which we apply the equity method of accounting. As of December 31, 2017 and 2016, our investments consisted of the following (in millions): 
 
December 31,
 
2017
 
2016
Citrus Corporation
$
1,698

 
$
1,709

SNG
1,495

 
1,505

Ruby
774

 
798

NGPL Holdings LLC
687

 
475

Gulf LNG Holdings Group, LLC
461

 
485

Plantation Pipe Line Company
331

 
333

EagleHawk
314

 
329

Utopia Holding LLC
276

 
55

MEP
253

 
328

Red Cedar Gathering Company
187

 
191

Watco Companies, LLC
182

 
180

Double Eagle Pipeline LLC
149

 
151

FEP
112

 
101

Liberty Pipeline Group LLC
71

 
75

Bear Creek Storage
63

 
61

Sierrita Gas Pipeline LLC
55

 
57

Fort Union Gas Gathering L.L.C.
12

 
25

All others                                                                                                 
178

 
169

Total investments
$
7,298

 
$
7,027

  
Summarized financial info of significant equity investment [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):