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Debt and Capital Leases (Debt Schedule)(Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2014
Debt Instrument            
Long-term Debt $ 19,406 $ 19,620        
Capital Lease Obligations 8 16        
Subtotal 19,414 19,636        
Current portion of long-term debt and capital leases 1,220 481        
Deferred Finance Costs, Net [1] 188 172        
Long-term debt and capital leases $ 18,006 18,983        
Debt Instrument, Description of Variable Rate Basis 3 month LIBOR          
Total premium $ 82 140        
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,222          
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,650          
Long-term Debt, Maturities, Repayments of Principal in Year Three 839          
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,273          
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,157          
Long-term Debt, Maturities, Repayments of Principal after Year Five 13,192          
Long-term Debt, excluding Unamortized Discount (Premium), net 19,333          
Recourse Debt            
Debt Instrument            
Long-term Debt 7,786 8,584        
Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt 11,620 11,036        
Senior notes, due 2018 | Recourse Debt            
Debt Instrument            
Long-term Debt $ 398 1,039        
Debt Instrument, Interest Rate, Stated Percentage [2] 7.625%          
Senior notes, due 2020 | Recourse Debt            
Debt Instrument            
Long-term Debt $ 0 1,058        
Debt Instrument, Interest Rate, Stated Percentage 8.25% [2]   8.25%      
Senior notes, due 2021 | Recourse Debt            
Debt Instrument            
Long-term Debt $ 207 1,128        
Debt Instrument, Interest Rate, Stated Percentage 7.875% [2]   7.875%      
Senior Notes Due In 2022 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 992 1,100        
Debt Instrument, Interest Rate, Stated Percentage [2] 6.25%          
Senior notes, due 2023 | Recourse Debt            
Debt Instrument            
Long-term Debt $ 869 936        
Debt Instrument, Interest Rate, Stated Percentage [2] 6.625%          
Senior Notes 2024 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 733 904        
Debt Instrument, Interest Rate, Stated Percentage [2] 6.25%          
Senior Notes due 2026 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 1,000 0        
Debt Instrument, Interest Rate, Stated Percentage 7.25% [2]     7.25%    
Senior Notes due 2027 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 1,250 0        
Debt Instrument, Interest Rate, Stated Percentage 6.625% [2]   6.625%      
Senior Credit Facility Due 2018 [Member]            
Debt Instrument            
Unamortized discount on debt instruments [3] $ 0 (3)        
Senior Credit Facility Due 2018 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 0 1,964        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 2.00%          
Term Loan Facility Due 2023 [Member]            
Debt Instrument            
Debt Instrument, Description of Variable Rate Basis 1 - month LIBOR          
Unamortized discount on debt instruments [3] $ (9) 0        
Debt Instrument, Unamortized Discount, Current [1] 1          
Term Loan Facility Due 2023 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 1,882 0        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 2.75%          
Indian River Power LLC Tax Exempt Bonds Due 2040 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 57 57        
Debt Instrument, Interest Rate, Stated Percentage [2] 0.00%          
Indian River Power LLC Tax Exempt Bonds Due 2045 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 190 190        
Debt Instrument, Interest Rate, Stated Percentage [2] 0.00%          
Dunkirk Power LLC Tax Exempt Bonds Due 2042 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 59 59        
Debt Instrument, Interest Rate, Stated Percentage [2] 0.00%          
Fort Bend County, tax exempt bonds, due 2045 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 22 22        
Debt Instrument, Interest Rate, Stated Percentage [2] 0.00%          
Fort Bend County, tax exempt bonds, due 2038 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 54 54        
Debt Instrument, Interest Rate, Stated Percentage [2] 0.00%          
Fort Bend County, tax exempt bonds, due 2042 [Member] | Recourse Debt            
Debt Instrument            
Long-term Debt $ 73 73        
Debt Instrument, Interest Rate, Stated Percentage [2] 0.00%          
Tax-exempt Bonds | Recourse Debt            
Debt Instrument            
Long-term Debt $ 455 455        
GenOn Senior Notes [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt 1,911 1,956        
GenOn Senior Notes Due in 2017 [Member]            
Debt Instrument            
Unamortized premium on debt instruments [4] 8 23        
GenOn Senior Notes Due in 2017 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 699 714        
Debt Instrument, Interest Rate, Stated Percentage [2] 7.875%          
GenOn senior notes, due 2018            
Debt Instrument            
Unamortized premium on debt instruments [4] $ 38 59        
GenOn senior notes, due 2018 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 687 708        
Debt Instrument, Interest Rate, Stated Percentage [2] 9.50%          
GenOn senior notes, due 2020            
Debt Instrument            
Unamortized premium on debt instruments [4] $ 35 44        
GenOn senior notes, due 2020 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 525 534        
Debt Instrument, Interest Rate, Stated Percentage [2] 9.875%          
GenOn Americas Generation senior notes | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 745 752        
GenOn Americas Generation Senior Notes Due in 2021 [Member]            
Debt Instrument            
Unamortized premium on debt instruments [4] 26 32        
GenOn Americas Generation Senior Notes Due in 2021 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 392 398        
Debt Instrument, Interest Rate, Stated Percentage [2] 8.50%          
GenOn Americas Generation senior notes, due 2031            
Debt Instrument            
Unamortized premium on debt instruments [4] $ 24 25        
GenOn Americas Generation senior notes, due 2031 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 353 354        
Debt Instrument, Interest Rate, Stated Percentage [2] 9.125%          
GenOn Other [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 96 56        
Genon [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt 2,752 2,764        
5.375% Senior Notes due in 2024 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 500 500        
Debt Instrument, Interest Rate, Stated Percentage [2] 5.375%          
5.00% Senior Notes due in 2026 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 350 0        
Debt Instrument, Interest Rate, Stated Percentage 5.00% [2]   5.00%      
NRG Yield Revolving Credit Facility [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 0 306        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 2.75%          
3.5% Convertible Notes due 2019 [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage           3.50%
Unamortized discount on debt instruments $ (10) (15)        
3.5% Convertible Notes due 2019 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 335 330        
Debt Instrument, Interest Rate, Stated Percentage [2] 3.50%          
3.25% Convertible Notes due 2020 [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage         3.25%  
Unamortized discount on debt instruments $ (17) (21)        
3.25% Convertible Notes due 2020 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 271 266        
Debt Instrument, Interest Rate, Stated Percentage [2] 3.25%          
El Segundo Energy Center, due 2023 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 443 485        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Marsh Landing, due 2017 and 2023            
Debt Instrument            
Debt Instrument, Description of Variable Rate Basis 1 - month LIBOR          
Marsh Landing, due 2017 and 2023 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 370 418        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Alta Wind I - V Lease financing arrangement [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 965 1,002        
Walnut Creek Energy, LLC, due in 2023 [Member]            
Debt Instrument            
Debt Instrument, Description of Variable Rate Basis 1 - month LIBOR          
Walnut Creek Energy, LLC, due in 2023 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 310 351        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 1.625%          
Tapestry Wind LLC due in 2021 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 172 181        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 1.625%          
CVSR due 2037 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 771 793        
CVSR Holdco due 2037 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 199 0        
Debt Instrument, Interest Rate, Stated Percentage [2] 4.68%          
Alpine Financing Agreement, due 2022 [Member]            
Debt Instrument            
Debt Instrument, Description of Variable Rate Basis 1 - month LIBOR          
Alpine Financing Agreement, due 2022 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 145 154        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 1.75%          
NRG Energy Center Minneapolis LLC Senior Secured Notes [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 96 108        
NRG Energy Center Minneapolis LLC Senior Secured Notes due 2031 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 125 0        
Debt Instrument, Interest Rate, Stated Percentage [2] 3.55%          
Viento Funding II, Inc., due in 2023 [Member]            
Debt Instrument            
Debt Instrument, Description of Variable Rate Basis 6 - month LIBOR          
Viento Funding II, Inc., due in 2023 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 178 189        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 2.75%          
NRG Yield - Other [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 540 573        
NRG Yield, Inc. [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt 5,770 5,656        
Ivanpah, due 2033 and 2038 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt 1,113 1,149        
Agua Caliente, due 2037 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt 849 879        
NRG Solar Dandan [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 76 $ 98        
Debt Instrument, Description of Variable Rate Basis   LIBOR        
Debt instrument, interest rate over variable rate (as a percent) [2] 2.25%          
Peaker bonds, due 2019            
Debt Instrument            
Unamortized discount on debt instruments [1] $ 0 $ (4)        
Peaker bonds, due 2019 | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 0 72        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 1.07%          
Cedro Hill Wind LLC, due in 2025 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 163 103        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 1.75%          
Utah Portfolio [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 287 0        
Debt Instrument, Description of Variable Rate Basis [2] LIBOR          
Debt instrument, interest rate over variable rate (as a percent) [2] 2.65%          
Midwest Generation due 2019 [Member]            
Debt Instrument            
Unamortized discount on debt instruments $ (13) 0        
Midwest Generation due 2019 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 218 0 $ 218      
Debt Instrument, Interest Rate, Stated Percentage [2] 4.39%          
NRG Other | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 392 315        
NRG Energy [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Long-term Debt $ 3,098 $ 2,616        
Minimum [Member] | El Segundo Energy Center, due 2023 | Non Recourse Debt [Member]            
Debt Instrument            
Debt instrument, interest rate over variable rate (as a percent) [2] 1.625%          
Minimum [Member] | Marsh Landing, due 2017 and 2023 | Non Recourse Debt [Member]            
Debt Instrument            
Debt instrument, interest rate over variable rate (as a percent) [2] 1.75%          
Minimum [Member] | Alta Wind I - V Lease financing arrangement [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 5.696%          
Minimum [Member] | CVSR due 2037 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 2.339%          
Minimum [Member] | NRG Energy Center Minneapolis LLC Senior Secured Notes [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 5.95%          
Minimum [Member] | Ivanpah, due 2033 and 2038 | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 2.285%          
Minimum [Member] | Agua Caliente, due 2037 | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 2.395%          
Maximum [Member] | El Segundo Energy Center, due 2023 | Non Recourse Debt [Member]            
Debt Instrument            
Debt instrument, interest rate over variable rate (as a percent) [2] 2.25%          
Maximum [Member] | Marsh Landing, due 2017 and 2023 | Non Recourse Debt [Member]            
Debt Instrument            
Debt instrument, interest rate over variable rate (as a percent) [2] 1.875%          
Maximum [Member] | Alta Wind I - V Lease financing arrangement [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 7.015%          
Maximum [Member] | CVSR due 2037 [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 3.775%          
Maximum [Member] | NRG Energy Center Minneapolis LLC Senior Secured Notes [Member] | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 7.25%          
Maximum [Member] | Ivanpah, due 2033 and 2038 | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 4.256%          
Maximum [Member] | Agua Caliente, due 2037 | Non Recourse Debt [Member]            
Debt Instrument            
Debt Instrument, Interest Rate, Stated Percentage [2] 3.633%          
[1] Repaid in 2016.
[2] 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%.
[3] Term loan facility, due 2018 replaced with the Term loan facility due 2023. Discount of $1 million was related to current maturities in 2016.
[4] Premiums for long-term debt acquired in the GenOn acquisition represent adjustments to record the debt at fair value in connection with the acquisition.