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Long-term Debt and Finance Leases - Tax Exempt Bonds (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 17, 2020 | Mar. 11, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 8,100,000,000 | $ 8,855,000,000 |  |
NRG Indian River Power 2020, tax exempt bonds, due 2040 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 57,000,000 | 57,000,000 |  |
Interest rate, stated percentage | 1.25% |  | 1.25% |
Aggregate principal amount |  |  | $ 57,000,000 |
NRG Indian River Power 2020, tax exempt bonds, due 2045 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 190,000,000 | 190,000,000 |  |
Interest rate, stated percentage | 1.25% |  | 1.25% |
Aggregate principal amount |  |  | $ 190,000,000 |
NRG Dunkirk 2020, tax exempt bonds, due 2042 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 59,000,000 | 59,000,000 |  |
Interest rate, stated percentage | 1.30% |  |  | 1.30%
Aggregate principal amount |  |  |  | $ 59,000,000
City of Texas City, tax exempt bonds, due 2045 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 33,000,000 | 33,000,000 |  |
Interest rate, stated percentage | 4.125% |  |  |
Fort Bend County, tax exempt bonds, due 2038 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 54,000,000 | 54,000,000 |  |
Interest rate, stated percentage | 4.75% |  |  |
Fort Bend County, tax exempt bonds, due 2042 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 73,000,000 | 73,000,000 |  |
Interest rate, stated percentage | 4.75% |  |  |
Tax-exempt bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 466,000,000 | $ 466,000,000 |  |
5.875% Dunkirk Power LLC Tax Exempt Bonds Due 2042 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.875% |  |  |
5.375% Indian River Power LLC Tax Exempt Bonds Due 2045 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.375% |  |  |
6.000% Indian River Power LLC Tax Exempt Bonds Due 2040 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.00% |  |  |

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