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Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | $ 24,651 |
Unamortized debt expense | 249 | $ 222
Carrying Amount |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) |  | 22,177
Fair Value |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | 21,997 | 20,525
CECONY |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | 23,409 |
Unamortized debt discount | 241 | 215
CECONY | Carrying Amount |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) |  | 21,060
CECONY | Fair Value |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | 20,915 | 19,517
Broken Bow II | Carrying Amount |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | 59 | 62
Broken Bow II | Fair Value |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | $ 54 | $ 58

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