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Investments Accounted for by the Equity Method and Variable Interest Entities (Tables)
 12 Months Ended
Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Summary NRG's equity method investments
The following table summarizes NRG's equity method investments as of December 31, 2019:
(In millions, except percentages)
NameEconomic
Interest		Investment Balance
Agua Caliente35.0 %213  
Gladstone37.5 %124  
Ivanpah Master Holdings, LLC54.5 %20  
Watson Cogeneration Company49.0 %15  
Midway-Sunset Cogeneration Company50.0 %9  
Other(a)
Various  7  
Total equity investments in affiliates$388  
(a) Refer to Note 11, Asset Impairments, for discussion of NRG's investment in Petra Nova Parish Holdings, LLC
Undistributed earnings by equity investment
 As of December 31,
(In millions)20192018
Undistributed earnings from equity investments$42  $34  
Summary of Financial Information for Consolidated VIEs
The summarized financial information for the Company's consolidated VIEs consisted of the following:
(In millions)December 31, 2019December 31, 2018
Current assets$3  $3  
Net property, plant and equipment71  76  
Other long-term assets27  28  
Total assets101  107  
Current liabilities4  2  
Long-term debt24  29  
Other long-term liabilities8  7  
Total liabilities36  38  
Redeemable noncontrolling interests20  19  
Net assets less noncontrolling interests$45  $50