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Investments in Unconsolidated Affiliates (Tables)
 12 Months Ended
Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Investments in Equity Method Unconsolidated Affiliates
The table below outlines Duke Energy's ownership interests in natural gas pipeline companies and natural gas storage facilities.
 
 
 
Investment Amount (in millions)
 
Ownership
 
December 31,
 
December 31,
Entity Name
Interest
 
2017
 
2016
Pipeline Investments
 
 
 
 
 
Atlantic Coast Pipeline, LLC(a)
47
%
 
$
397

 
$
265

Sabal Trail Transmission, LLC
7.5
%
 
219

 
140

Constitution Pipeline, LLC(a)
24
%
 
81

 
82

Cardinal Pipeline Company, LLC(b)
21.49
%
 
11

 
16

Storage Facilities
 
 
 
 
 
Pine Needle LNG Company, LLC(b)
45
%
 
13

 
16

Hardy Storage Company, LLC(b)
50
%
 
42

 
47

Total Investments(c)
 
 
$
763

 
$
566


(a)
During the year ended December 31, 2017, Piedmont transferred its share of ownership interest in ACP and Constitution to a wholly owned subsidiary of Duke Energy at book value.
(b)
Piedmont owns the Cardinal, Pine Needle and Hardy Storage investments.
(c)
Duke Energy includes purchase accounting adjustments related to Piedmont.
The following table presents Duke Energy’s investments in unconsolidated affiliates accounted for under the equity method, as well as the respective equity in earnings, by segment.
 
Years Ended December 31,
 
2017
 
2016
 
2015
 
 
 
Equity in

 
 
 
Equity in

 
Equity in

(in millions)
Investments

 
earnings

 
Investments

 
earnings

 
earnings

Electric Utilities and Infrastructure
$
89

 
$
5

 
$
93

 
$
5

 
$
(2
)
Gas Utilities and Infrastructure
763

 
62

 
566

 
19

 
1

Commercial Renewables
190

 
(5
)
 
185

 
(82
)
 
(6
)
Other
133

 
57

 
81

 
43

 
76

Total
$
1,175


$
119


$
925


$
(15
)

$
69