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Nature of Business (Details 2 - Yield IPO)
$ in Millions
12 Months Ended
Jul. 30, 2014
USD ($)
shares
Dec. 31, 2016
shares
Dec. 31, 2015
shares
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Common stock, shares outstanding   315,443,011 314,190,042
Class A Common Stock | NRG Yield, Inc. [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Shares, Issued 12,075,000    
Proceeds from Issuance or Sale of Equity | $ $ 630    
Public Shareholders [Member] | NRG Yield, Inc. [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Common Stock, Voting Interest   0.449  
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest   53.30%  
NRG [Member] | NRG Yield, Inc. [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Common Stock, Voting Interest   0.551  
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest   46.70%