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Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt expense | $ 221 | $ 222
Carrying Amount |  |
Debt Instrument [Line Items] |  |
Long-term debt (including current portion) | 22,179 | 22,177
Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt (including current portion) | 20,101 | 20,525
CECONY | Subsidiaries |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount | 213 | 215
CECONY | Carrying Amount | Subsidiaries |  |
Debt Instrument [Line Items] |  |
Long-term debt (including current portion) | 21,062 | 21,060
CECONY | Fair Value | Subsidiaries |  |
Debt Instrument [Line Items] |  |
Long-term debt (including current portion) | 19,114 | $ 19,517
Broken Bow II | Carrying Amount |  |
Debt Instrument [Line Items] |  |
Long-term debt (including current portion) | 62 |
Broken Bow II | Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt (including current portion) | $ 57 |

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