Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Unamortized debt expense	$ 202	$ 226
Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	20,796	23,044
Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	18,234	26,287
CECONY
Debt Instrument [Line Items]
Unamortized debt discount	195	193
CECONY | Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	19,080	18,382
CECONY | Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	16,699	$ 21,382
Clean Energy Businesses | Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	2,645
Clean Energy Businesses | Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	$ 2,489