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Investments In and Advances To Affiliates (Tables)
 12 Months Ended
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Equity Ownership Interest And Carrying Values Of Investments Accounted For Under The Equity Method The following table summarizes the relevant effective equity ownership interest and carrying values for the Company's investments accounted for under the equity method as of the periods indicated:
December 31,
 
 
2018
 
2017
 
2018
 
2017
Affiliate
Country
 
Carrying Value (in millions)
 
Ownership Interest %
sPower
United States
 
$
515

 
$
508

 
50
%
 
50
%
OPGC (1)
India
 
293

 
269

 
49
%
 
49
%
Guacolda (2)
Chile
 
209

 
357

 
33
%
 
33
%
Other affiliates (3)
Various
 
97

 
63

 
 
 
 
Total
 
 
$
1,114

 
$
1,197

 
 
 
 

_____________________________
(1) 
OPGC has one coal-fired project under development which is an expansion of our existing OPGC business. The project started construction in April 2014 and is expected to begin operations in 2019.
(2) 
The Company's ownership in Guacolda is held through AES Gener, a 67%-owned consolidated subsidiary. AES Gener owns 50% of Guacolda, resulting in an AES effective ownership in Guacolda of 33%.
(3) 
Includes Fluence, Simple Energy, Bosforo, Elsta, Distributed Energy equity method investments, and others.
Investments In and Advances to Affiliates Financial Information The following tables summarize financial information of the Company's 50%-or-less-owned affiliates and majority-owned unconsolidated subsidiaries that are accounted for using the equity method (in millions):
 
50%-or-less Owned Affiliates
 
Majority-Owned Unconsolidated Subsidiaries
Years ended December 31,
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Revenue
$
962

 
$
762

 
$
586

 
$
40

 
$
16

 
$
23

Operating margin
135

 
165

 
145

 
3

 
5

 
9

Net income (loss)
14

 
72

 
64

 
(3
)
 
(15
)
 
(2
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31,
2018
 
2017
 
 
 
2018
 
2017
 
 
Current assets
$
558

 
$
418

 
 
 
$
89

 
$
70

 
 
Noncurrent assets
5,918

 
5,372

 
 
 
41

 
102

 
 
Current liabilities
546

 
633

 
 
 
35

 
10

 
 
Noncurrent liabilities
3,309

 
2,629

 
 
 
122

 
147

 
 
Stockholders' equity
2,622

 
2,527

 
 
 
(27
)
 
15