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Debt and Capital Leases - Energy Center Minneapolis Series Notes (Details) - USD ($) $ in Millions | Jun. 19, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Amount | $ 120 | $ 16,092 | $ 16,633
Non Recourse Debt |  |  |
Debt Instrument [Line Items] |  |  |
Amount |  | $ 8,363 | $ 9,451
Non Recourse Debt | Energy Center Minneapolis Series E Notes, due 2033 |  |  |
Debt Instrument [Line Items] |  |  |
Amount | $ 70 |  |
Interest Rate | 4.80% |  |
Non Recourse Debt | Energy Center Minneapolis Series F Notes, due 2033 |  |  |
Debt Instrument [Line Items] |  |  |
Amount | $ 10 |  |
Interest Rate | 4.60% |  |
Non Recourse Debt | Energy Center Minneapolis Series G Notes, due 2035 |  |  |
Debt Instrument [Line Items] |  |  |
Amount | $ 83 |  |
Interest Rate | 5.90% |  |
Non Recourse Debt | Energy Center Minneapolis Series H Notes, due 2037 |  |  |
Debt Instrument [Line Items] |  |  |
Amount | $ 40 |  |
Interest Rate | 4.83% |  |
Non Recourse Debt | NRG Energy Center Minneapolis LLC Series E, F, G And H Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amount | $ 203 |  |
Non Recourse Debt | Repayment of Energy Center Minneapolis Series C Notes, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate | 5.95% |  |
Repayment of Energy Center Minneapolis Series C Notes, due 2025 | $ (83) |  |

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