v3.5.0.2
Debt and Capital Leases (Details 1 - Debt Table) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Debt and Capital Leases      
Long-term Debt $ 19,253 $ 19,253 $ 19,620
Capital Lease Obligations 13 13 13
Subtotal 19,268 19,268 19,636
Less current maturities 1,215 1,215 481
Deferred Finance Costs, Net 160 160 172
Total long-term debt and capital leases 17,893 $ 17,893 18,983
Interest rate, variable basis   3 month LIBOR  
Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 8,234 $ 8,234 8,584
Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 11,019 $ 11,019 11,036
Marsh Landing Term Loan Facility [Member]      
Debt and Capital Leases      
Interest rate, variable basis   1 - month LIBOR  
Marsh Landing Term Loan Facility [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 410 $ 410 418
Senior Notes Due In 2018 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Debt Instrument, Principal Amount Repurchased 451 451  
Debt Instrument, Repurchase Amount [1] $ 499 499  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 107.95%    
Long-term Debt $ 587 $ 587 1,039
Interest rate, stated rate [2] 7.625% 7.625%  
Senior Notes Due In 2020 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Debt Instrument, Principal Amount Repurchased $ 239 $ 239  
Debt Instrument, Repurchase Amount [1] $ 254 254  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 104.38%    
Long-term Debt $ 818 $ 818 1,058
Interest rate, stated rate [2] 8.25% 8.25%  
Senior Notes Due In 2021 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Debt Instrument, Principal Amount Repurchased $ 240 $ 240  
Debt Instrument, Repurchase Amount [1] $ 250 250  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 104.19%    
Long-term Debt $ 889 $ 889 1,128
Interest rate, stated rate [2] 7.875% 7.875%  
Senior Notes Due In 2022 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Debt Instrument, Principal Amount Repurchased $ 108 $ 108  
Debt Instrument, Repurchase Amount [1] $ 105 105  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 94.73%    
Long-term Debt $ 992 $ 992 1,100
Interest rate, stated rate [2] 6.25% 6.25%  
Senior Notes Due in 2023 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Debt Instrument, Principal Amount Repurchased $ 67 $ 67  
Debt Instrument, Repurchase Amount [1] $ 64 64  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 94.13%    
Long-term Debt $ 869 $ 869 936
Interest rate, stated rate [2] 6.625% 6.625%  
Senior Notes 2024 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Debt Instrument, Principal Amount Repurchased $ 171 $ 171  
Debt Instrument, Repurchase Amount [1] $ 163 163  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 94.52%    
Long-term Debt $ 734 $ 734 904
Interest rate, stated rate [2] 6.25% 6.25%  
Senior Notes due 2026 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 1,000 $ 1,000 0
Interest rate, stated rate [2] 7.25% 7.25%  
Term loan facility, due 2018 | Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 0 $ 0 1,964
Term Loan Facility Due 2023 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 1,890 1,890 0
Tax-exempt Bonds [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 455 $ 455 455
Indian River Power LLC, tax-exempt bonds, due 2040 | Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 6.00% 6.00%  
Indian River Power LLC, tax-exempt bonds, due 2045 | Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 5.375% 5.375%  
Dunkirk Power LLC, tax-exempt bonds, due 2042 | Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 5.875% 5.875%  
Fort Bend County, tax-exempt bonds, due 2038 and 2042 | Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 4.125% 4.125%  
GenOn Senior Notes [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 1,934 $ 1,934 1,956
GenOn Senior Notes Due in 2017 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 7.875% 7.875%  
GenOn senior notes, due 2018 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 9.50% 9.50%  
GenOn senior notes, due 2020 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 9.875% 9.875%  
GenOn Americas Generation Senior Notes [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 748 $ 748 752
GenOn Americas Generation Senior Notes Due in 2021 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 8.50% 8.50%  
GenOn Americas Generation senior notes, due in 2031 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 9.125% 9.125%  
GenOn Other [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 53 $ 53 56
Genon [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 2,735 2,735 2,764
5.375% Senior Notes due in 2024 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 500 $ 500 500
Interest rate, stated rate [2] 5.375% 5.375%  
NRG Yield Revolving Credit Facility [Member]      
Debt and Capital Leases      
Interest rate, variable basis   1 - month LIBOR  
NRG Yield Revolving Credit Facility [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 318 $ 318 306
3.5% Convertible Notes due 2019 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 333 $ 333 330
Interest rate, stated rate [2] 3.50% 3.50%  
3.25% Convertible Notes due 2020 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 268 $ 268 266
Interest rate, stated rate [2] 3.25% 3.25%  
West Holdings Credit Agreement [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 457 $ 457 485
Alta Wind I - V Lease financing arrangement [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 978 $ 978 1,002
Alta Wind I [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 7.015% 7.015%  
Alta Wind II [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 5.696% 5.696%  
Alta Wind III [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 6.067% 6.067%  
Alta Wind IV [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 5.938% 5.938%  
Alta Wind V [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 6.071% 6.071%  
Walnut Creek Energy, LLC, due in 2023 [Member]      
Debt and Capital Leases      
Interest rate, variable basis   1 - month LIBOR  
Walnut Creek Energy, LLC, due in 2023 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 341 $ 341 351
Interest rate, variable basis [2]   LIBOR  
Tapestry Wind LLC due in 2021 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 176 $ 176 181
Interest rate, variable basis [2]   LIBOR  
Laredo Ridge Wind, LLC, due in 2026 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 102 $ 102 104
Interest rate, variable basis [2]   LIBOR  
NRG Solar Alpine LLC, due 2022 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 151 $ 151 154
NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017, and 2025 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 100 $ 100 108
NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2025 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 5.95% 5.95%  
Viento Funding II, Inc., due in 2023 [Member]      
Debt and Capital Leases      
Interest rate, variable basis   6 - month LIBOR  
Viento Funding II, Inc., due in 2023 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt $ 183 $ 183 189
Interest rate, variable basis [2]   LIBOR  
NRG Yield - Other [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 455 $ 455 469
NRG Yield, Inc. | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 4,772 4,772 4,863
Ivanpah Financing, due 2014 and 2038 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 1,141 1,141 1,149
Agua Caliente Solar LLC, due 2037 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 874 874 879
CVSR - High Plains Ranch II LLC, due 2037 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 780 780 793
NRG Solar Dandan [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 101 101 98
NRG Peaker Finance Co. LLC Bonds Due 2019 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 0 $ 0 72
Interest rate, variable basis [2]   LIBOR  
Cedro Hill Wind LLC, due in 2025 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 100 $ 100 103
Interest rate, variable basis [2]   LIBOR  
Midwest Generation due 2019 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 249 $ 249 0
Other (Non-recourse debt) | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 267 267 315
NRG Energy [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Long-term Debt 3,512 3,512 3,409
Other (Capital leases)      
Debt and Capital Leases      
Capital Lease Obligations $ 2 $ 2 $ 3
London Interbank Offered Rate (LIBOR) [Member] | Term loan facility, due 2018 | Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
Interest rate, basis spread on variable rate [2]   2.00%  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facility Due 2023 [Member] | Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
Interest rate, basis spread on variable rate [2]   2.75%  
London Interbank Offered Rate (LIBOR) [Member] | NRG Yield Revolving Credit Facility [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
Interest rate, basis spread on variable rate [2]   2.75%  
London Interbank Offered Rate (LIBOR) [Member] | West Holdings Credit Agreement [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
London Interbank Offered Rate (LIBOR) [Member] | Marsh Landing Term Loan Due 2017 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
Interest rate, basis spread on variable rate [2]   1.75%  
London Interbank Offered Rate (LIBOR) [Member] | GenOn Marsh Landing term loan, due 2023 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
Interest rate, basis spread on variable rate [2]   1.875%  
London Interbank Offered Rate (LIBOR) [Member] | Walnut Creek Energy, LLC, due in 2023 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, basis spread on variable rate [2]   1.625%  
London Interbank Offered Rate (LIBOR) [Member] | Tapestry Wind LLC due in 2021 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, basis spread on variable rate [2]   1.625%  
London Interbank Offered Rate (LIBOR) [Member] | Laredo Ridge Wind, LLC, due in 2026 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, basis spread on variable rate [2]   1.875%  
London Interbank Offered Rate (LIBOR) [Member] | NRG Solar Alpine LLC, due 2022 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
Interest rate, basis spread on variable rate [2]   1.75%  
London Interbank Offered Rate (LIBOR) [Member] | Viento Funding II, Inc., due in 2023 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, basis spread on variable rate [2]   2.75%  
London Interbank Offered Rate (LIBOR) [Member] | NRG Solar Dandan [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, variable basis [2]   LIBOR  
Interest rate, basis spread on variable rate [2]   2.25%  
London Interbank Offered Rate (LIBOR) [Member] | NRG Peaker Finance Co. LLC Bonds Due 2019 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, basis spread on variable rate [2]   1.07%  
London Interbank Offered Rate (LIBOR) [Member] | Cedro Hill Wind LLC, due in 2025 [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, basis spread on variable rate [2]   3.125%  
Minimum [Member] | NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2017 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 7.12% 7.12%  
Minimum [Member] | Ivanpah Financing, due 2014 and 2038 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 2.285% 2.285%  
Minimum [Member] | Agua Caliente Solar LLC, due 2037 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 2.395% 2.395%  
Minimum [Member] | CVSR - High Plains Ranch II LLC, due 2037 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 2.339% 2.339%  
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | West Holdings Credit Agreement [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 1.625% 1.625%  
Maximum [Member] | NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2017 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 7.25% 7.25%  
Maximum [Member] | Ivanpah Financing, due 2014 and 2038 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 4.256% 4.256%  
Maximum [Member] | Agua Caliente Solar LLC, due 2037 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 3.633% 3.633%  
Maximum [Member] | CVSR - High Plains Ranch II LLC, due 2037 | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 3.775% 3.775%  
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | West Holdings Credit Agreement [Member] | Non Recourse Debt [Member]      
Debt and Capital Leases      
Interest rate, stated rate [2] 2.25% 2.25%  
[1] (a) Includes accrued interest.
[2] As of June 30, 2016, L+ equals 3 month LIBOR plus x%, with the exception of the Viento Funding II term loan, which is 6 month LIBOR plus x%, and the NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield Operating LLC revolving credit facility, and 2016 Term Loan Facility, which are 1 month LIBOR plus x%.