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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Related Party Transaction          
General and administrative $ 4 $ 4 [1] $ 14 $ 10 [1]  
GenOn Energy Services LLC [Member]          
Related Party Transaction          
Due to Affiliate         $ 6
NRG [Member]          
Related Party Transaction          
Revenue from Related Parties 3 4 10 10  
NRG RENOM [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 6 4 16 9  
Due to Affiliate 4   4   5
Thermal [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 1 1 7 6  
Marsh Landing [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 4 4 10 9  
NRG Yield [Member] | NRG [Member]          
Related Party Transaction          
General and administrative 2 2 8 7  
NRG Yield [Member] | NRG [Member] | Scenario, Plan [Member]          
Related Party Transaction          
Management Services Fee, Annual     8    
Operations and Maintenance services [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 10 9 29 28  
Due to Affiliate 21   21   $ 22
Due to Affiliate - Noncurrent 3   3    
Operations and Maintenance services [Member] | GCE Holding LLC [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party $ 1 $ 1 $ 4 $ 4  
[1] (a) Retrospectively adjusted as discussed in Note 1, Nature of Business.