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Debt and Capital Leases Debt and Capital Leases (NRG Recourse Debt 3 - Sr Cr Facility- TaxExempt Bonds) (Details 4)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument          
Long-term Debt     $ 19,406 $ 19,620  
Debt Instrument, Description of Variable Rate Basis     3 month LIBOR    
Gain (Loss) on Extinguishment of Debt     $ (142) 75 $ (95)
Term Loan Facility Due 2023 [Member]          
Debt Instrument          
Debt Instrument, Description of Variable Rate Basis     1 - month LIBOR    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument          
Debt Instrument, Description of Variable Rate Basis   LIBOR      
Line of Credit Facility, Maximum Borrowing Capacity   $ 0      
Recourse Debt [Member]          
Debt Instrument          
Long-term Debt     $ 7,786 8,584  
Recourse Debt [Member] | Term Loan Facility Due 2023 [Member]          
Debt Instrument          
Long-term Debt     $ 1,882 0  
Proceeds from Issuance of Senior Long-term Debt   $ 1,900      
Debt Instrument, Description of Variable Rate Basis [1]     LIBOR    
Debt Instrument, Basis Spread on Variable Rate [1]     2.75%    
Percent of face value   99.50%      
Debt Instrument, Periodic Payment, Percentage of Principal   0.0025      
Gain (Loss) on Extinguishment of Debt   $ 21      
Recourse Debt [Member] | Term Loan Facility Due 2023 [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument          
Debt Instrument, Description of Variable Rate Basis   LIBOR      
Debt Instrument, Basis Spread on Variable Rate   2.75%      
Recourse Debt [Member] | Term Loan Facility Due 2023 [Member] | London Interbank Offered Rate (LIBOR) floor [Member]          
Debt Instrument          
Debt Instrument, Description of Variable Rate Basis   LIBOR      
Debt Instrument, Basis Spread on Variable Rate   0.75%      
Recourse Debt [Member] | Indian River Power LLC Tax Exempt Bonds Due 2040 [Member]          
Debt Instrument          
Long-term Debt     $ 57 57  
Debt Instrument, Interest Rate, Stated Percentage [1]     0.00%    
Recourse Debt [Member] | Indian River Power LLC Tax Exempt Bonds Due 2045 [Member]          
Debt Instrument          
Long-term Debt     $ 190 190  
Debt Instrument, Interest Rate, Stated Percentage [1]     0.00%    
Recourse Debt [Member] | Dunkirk Power LLC Tax Exempt Bonds Due 2042 [Member]          
Debt Instrument          
Long-term Debt     $ 59 59  
Debt Instrument, Interest Rate, Stated Percentage [1]     0.00%    
Recourse Debt [Member] | Fort Bend County, tax exempt bonds, due 2045 [Member]          
Debt Instrument          
Long-term Debt     $ 22 22  
Debt Instrument, Interest Rate, Stated Percentage [1]     0.00%    
Recourse Debt [Member] | Fort Bend County, tax exempt bonds, due 2038 [Member]          
Debt Instrument          
Long-term Debt     $ 54 54  
Debt Instrument, Interest Rate, Stated Percentage [1]     0.00%    
Recourse Debt [Member] | Fort Bend County, tax exempt bonds, due 2042 [Member]          
Debt Instrument          
Long-term Debt     $ 73 73  
Debt Instrument, Interest Rate, Stated Percentage [1]     0.00%    
Recourse Debt [Member] | Tax-exempt Bonds          
Debt Instrument          
Long-term Debt     $ 455 $ 455  
Subsequent Event [Member] | Recourse Debt [Member] | Term Loan Facility Due 2023 [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument          
Debt Instrument, Description of Variable Rate Basis LIBOR        
Debt Instrument, Basis Spread on Variable Rate 2.25%        
Subsequent Event [Member] | Recourse Debt [Member] | Term Loan Facility Due 2023 [Member] | London Interbank Offered Rate (LIBOR) floor [Member]          
Debt Instrument          
Debt Instrument, Description of Variable Rate Basis LIBOR        
Debt Instrument, Basis Spread on Variable Rate 0.75%        
2016 Tranche A Revolving Credit Facility due 2018 [Member] | Revolving Credit Facility [Member]          
Debt Instrument          
Line of Credit Facility, Maximum Borrowing Capacity   $ 289      
2016 Tranche B Revolving Credit Facility due 2021 [Member] [Member] | Revolving Credit Facility [Member]          
Debt Instrument          
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,200      
[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%.