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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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