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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Related Party Transaction          
General and administrative $ 6 $ 3 [1] $ 10 $ 6 [1]  
Due to Affiliate, Current 31   31   $ 40
GenOn Energy Services LLC [Member]          
Related Party Transaction          
Due to Affiliate         6
NRG [Member]          
Related Party Transaction          
Revenue from Related Parties 3 3 7 6  
NRG RENOM [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 7 3 10 5  
Due to Affiliate 3   3   5
NRG Yield [Member] | NRG [Member]          
Related Party Transaction          
General and administrative 4 3 6 5  
NRG Yield [Member] | NRG [Member] | Scenario, Plan [Member]          
Related Party Transaction          
Management Services Fee, Annual     8    
Thermal [Member] | NRG [Member]          
Related Party Transaction          
Due to Affiliate 20   20   $ 22
Accounts payable — affiliate 9   9    
NRG Energy Center Minneapolis LLC [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 2 1 6 5  
Marsh Landing [Member] | GenOn Energy Services LLC [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 3 3 6 5  
NRG DGPV Holdco 2 [Member] | NRG [Member]          
Related Party Transaction          
Due to Affiliate 9   9    
Operations and Maintenance services [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 9 10 19 19  
Operations and Maintenance services [Member] | Thermal [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 7 8 15 15  
Operations and Maintenance services [Member] | GCE Holding LLC [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party 2   3    
Operations and Maintenance services [Member] | Walnut Creek [Member] | NRG [Member]          
Related Party Transaction          
Related Party Transaction, Expenses from Transactions with Related Party $ 2 $ 2 $ 4 $ 4  
[1] (a) Retrospectively adjusted as discussed in Note 1, Nature of Business.