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Consolidated Statement of Capitalization - Long-term Debt (Parenthetical) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Nov. 30, 2024 | Dec. 31, 2023
Tax-Exempt Debt |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Long-Term Debt, Gross |  | $ 225 |  | $ 450
Debenture Series 2017B, 4.825% Due 2027 | Debentures |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Debt instrument, SOFR variable rate |  | 52.00% |  |
Tax Exempt Debt Series 2010A Due 2024 | Tax-Exempt Debt |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Long-Term Debt, Gross | [1] | $ 0 | $ 225 | $ 225
[1] | In November 2024, all of the $225 million of Series 2010A tax-exempt bonds issued for the benefit of CECONY, bearing interest at a weekly rate, were redeemed.

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