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Long-term Debt and Finance Leases - Tax Exempt Bonds (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Instrument [Line Items] |  |
Long-term debt | $ 8,100 | $ 8,100
NRG Indian River Power 2020, tax exempt bonds, due 2040 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 57 | 57
Interest rate, stated percentage | 1.25% |
NRG Indian River Power 2020, tax exempt bonds, due 2045 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 190 | 190
Interest rate, stated percentage | 1.25% |
NRG Dunkirk 2020, tax exempt bonds, due 2042 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 59 | 59
Interest rate, stated percentage | 1.30% |
City of Texas City, tax exempt bonds, due 2045 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 33 | 33
Interest rate, stated percentage | 4.125% |
Fort Bend County, tax exempt bonds, due 2038 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 54 | 54
Interest rate, stated percentage | 4.75% |
Fort Bend County, tax exempt bonds, due 2042 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 73 | 73
Interest rate, stated percentage | 4.75% |
Tax-exempt bonds |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 466 | $ 466

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