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Debt and Capital Leases - Recourse Debt Redemption Period (Details) - Recourse Debt | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Call feature |  |  | Generally, if an event of default occurs, the Trustee or the Holders of at least 25% in principal amount of the then outstanding series of Senior Notes may declare all of the Senior Notes of such series to be due and payable immediately.
Average Early Redemption Percentage |  |  | 25.00%
Senior Notes 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Average Early Redemption Percentage |  |  | 35.00%
Senior Notes 2024 | Treasury Rate |  |  |
Debt Instrument [Line Items] |  |  |
Treasury rate redemption (as percentage) |  |  | 0.50%
Premium percentage of principal amount of note discount factor (as percent) |  |  | 1.00%
Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Average Early Redemption Percentage |  |  | 35.00%
Senior Notes due 2026 | Treasury Rate |  |  |
Debt Instrument [Line Items] |  |  |
Treasury rate redemption (as percentage) |  |  | 0.50%
Premium percentage of principal amount of note discount factor (as percent) |  |  | 1.00%
Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Average Early Redemption Percentage | 103.06% |  |
Redemption percentage |  |  | 35.00%
Senior Notes due 2027 | Treasury Rate |  |  |
Debt Instrument [Line Items] |  |  |
Treasury rate redemption (as percentage) |  |  | 0.50%
Premium percentage of principal amount of note discount factor (as percent) |  |  | 1.00%
Senior Notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Average Early Redemption Percentage | 99.13% | 99.24% |
Redemption percentage |  |  | 35.00%
Senior Notes due 2028 | Treasury Rate |  |  |
Debt Instrument [Line Items] |  |  |
Treasury rate redemption (as percentage) |  |  | 0.50%
Premium percentage of principal amount of note discount factor (as percent) |  |  | 1.00%
May 1, 2019 to April 30, 2020 | Senior Notes 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 103.125%
May 1, 2020 to April 30, 2021 | Senior Notes 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 102.083%
May 1, 2021 to April 30, 2022 | Senior Notes 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 101.042%
May 1, 2022 and thereafter | Senior Notes 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 100.00%
Redemption Period prior to 1 May 2019 | Senior Notes 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption description |  |  | At any time prior to May 1, 2019, NRG may redeem up to 35% of the aggregate principal amount of the 2024 Senior Notes, at a redemption price equal to 100% of the principal amount, accrued and unpaid interest to the redemption date, plus a premium. The premium is the greater of: (i) 1% of the principal amount of the notes; or (ii) the excess of the principal amount of the note over the following: the present value of 103.125% of the note, plus interest payments due on the note from the date of redemption through May 1, 2019 computed using a discount rate equal to the Treasury Rate as of such redemption date plus 0.50%.
Redemption percentage |  |  | 106.25%
Present value of note(as percentage) |  |  | 1.03125
Redemption Period Prior To 1 May 2019 | Senior Notes 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 100.00%
Redemption Period Prior to 15 May 2019 | Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption description |  |  | At any time prior to May 15, 2019, NRG may redeem up to 35% of the aggregate principal amount of the 2026 Senior Notes, at a redemption price equal to 107.25% of the principal amount of the notes redeemed, plus accrued and unpaid interest, with an amount equal to the net cash proceeds of certain equity offerings
Redemption percentage |  |  | 107.25%
Redemption Period Prior To 15 May 2021 | Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption description |  |  | At any time prior to May 15, 2021, NRG may redeem all or a part of the 2026 Senior Notes, at a redemption price equal to 100% of the principal amount, accrued and unpaid interest to the redemption date, plus a premium. The premium is the greater of: (i) 1% of the principal amount of the notes; or (ii) the excess of the principal amount of the note over the following: the present value of 103.625% of the note, plus interest payments due on the note from the date of redemption through May 15, 2021 computed using a discount rate equal to the Treasury Rate as of such redemption date plus 0.50%.
Redemption percentage |  |  | 100.00%
Present value of note(as percentage) |  |  | 1.03625
May 15, 2021 to May 14, 2022 | Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 103.625%
May 15, 2022 to May 14, 2023 | Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 102.417%
May 15, 2023 to May 14, 2024 | Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 101.208%
May 15, 2024 and thereafter | Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 100.00%
Redemption Period Prior To 15 July 2019 | Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption description |  |  | At any time prior to July 15, 2019, NRG may redeem up to 35% of the aggregate principal amount of the 2027 Senior Notes, at a redemption price equal to 106.625% of the principal amount of the notes redeemed, plus accrued and unpaid interest, with an amount equal to the net cash proceeds of certain equity offerings.
Redemption percentage |  |  | 106.625%
Redemption Period Prior To 15 July 2021 | Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption description |  |  | At any time prior to July 15, 2021 NRG may redeem all or a part of the 2027 Senior Notes, at a redemption price equal to 100% of the principal amount, accrued and unpaid interest to the redemption date, plus a premium. The premium is the greater of: (i) 1% of the principal amount of the notes; or (ii) the excess of the principal amount of the note over the following: the present value of 103.313% of the note, plus interest payments due on the note from the date of redemption through July 15, 2021 computed using a discount rate equal to the Treasury Rate as of such redemption date plus 0.50%.
Redemption percentage |  |  | 100.00%
Present value of note(as percentage) |  |  | 1.03313
July 15, 2021 to July14, 2022 | Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 103.313%
July 15, 2022 to July 14, 2023 | Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 102.208%
July 15, 2023 to July 14, 2024 | Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 101.104%
July 15, 2024 and thereafter | Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 100.00%
Redemption Period Prior to January 15, 2021 | Senior Notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 105.75%
Redemption Period Prior to January 15, 2023 | Senior Notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 100.00%
Present value of note(as percentage) |  |  | 1.02875
January 15, 2023 to January 14, 2024 | Senior Notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 102.875%
January 15, 2024 to January 14, 2025 | Senior Notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 101.917%
January 15, 2025 to January 14, 2026 | Senior Notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 100.958%
January 15, 2026 and thereafter | Senior Notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage |  |  | 100.00%

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