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Debt and Capital Leases Debt and Capital Leases (NRG Non-Recourse Debt 3 - Yield Notes) (Details 7)
3 Months Ended
Aug. 05, 2014
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
Sep. 30, 2014
Mar. 31, 2014
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Debt Instrument              
Long-term Debt   $ 19,406,000,000         $ 19,620,000,000
NRG Yield Revolving Credit Facility [Member]              
Debt Instrument              
Line of Credit Facility, Fair Value of Amount Outstanding   0          
3.25% Convertible Notes due 2020 [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Stated Percentage       3.25%      
Convertible Debt       $ 287,500,000      
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 27.50      
Debt Instrument, Convertible, Conversion Ratio       36.3636      
Debt Instrument, Face Amount       $ 1,000      
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt       23,000,000      
3.5% Convertible Notes due 2019 [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Stated Percentage           3.50%  
Convertible Debt           $ 345,000,000  
Debt Instrument, Convertible, Conversion Price | $ / shares           $ 46.55  
Debt Instrument, Convertible, Conversion Ratio           21.4822  
Debt Instrument, Face Amount       $ 1,000   $ 1,000  
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt           $ 23,000,000  
Non Recourse Debt [Member]              
Debt Instrument              
Long-term Debt   $ 11,620,000,000         11,036,000,000
Non Recourse Debt [Member] | 5.375% Senior Notes due in 2024 [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Stated Percentage [1]   5.375%          
Long-term Debt   $ 500,000,000         500,000,000
Non Recourse Debt [Member] | NRG Yield Revolving Credit Facility [Member]              
Debt Instrument              
Long-term Debt   $ 0         306,000,000
Non Recourse Debt [Member] | NRG Energy Center Minneapolis Series D Notes [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Stated Percentage   3.55%          
Proceeds from Issuance of Debt   $ 125,000,000          
Non Recourse Debt [Member] | 3.25% Convertible Notes due 2020 [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Stated Percentage [1]   3.25%          
Long-term Debt   $ 271,000,000         266,000,000
Non Recourse Debt [Member] | 3.5% Convertible Notes due 2019 [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Stated Percentage [1]   3.50%          
Long-term Debt   $ 335,000,000         330,000,000
Non Recourse Debt [Member] | 5.00% Senior Notes due in 2026 [Member]              
Debt Instrument              
Proceeds from Issuance of Senior Long-term Debt     $ 350,000,000        
Debt Instrument, Interest Rate, Stated Percentage   5.00% [1] 5.00%        
Long-term Debt   $ 350,000,000         $ 0
Shelf Facility [Member] | NRG Energy Center Minneapolis Series D Notes [Member]              
Debt Instrument              
Long-term Debt   70,000,000          
Letter of Credit [Member] | NRG Yield Revolving Credit Facility [Member]              
Debt Instrument              
Letters of Credit Outstanding, Amount   $ 60,000,000          
NRG Yield, Inc. [Member] | Non Recourse Debt [Member] | 5.375% Senior Notes due in 2024 [Member]              
Debt Instrument              
Proceeds from Issuance of Senior Long-term Debt $ 500,000,000            
Debt Instrument, Interest Rate, Stated Percentage 5.375%            
Adjusted Conversion Ratio [Member] | 3.5% Convertible Notes due 2019 [Member]              
Debt Instrument              
Debt Instrument, Convertible, Conversion Ratio         42.9644    
[1] As of December 31, 2016, L+ equals 3 month LIBOR plus x%, with the exception of the Viento term loan, which is 6 month LIBOR plus x% and the Alpine term loan, the NRG Marsh Landing term loan, the Walnut Creek loan, and 2023 Term Loan Facility, which are 1 month LIBOR plus x%.