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Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt expense | $ 200 | $ 202
Carrying Amount |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | 21,300 | 20,796
Fair Value |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | 17,726 | 18,234
CECONY | Subsidiaries |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount | 192 | 195
CECONY | Carrying Amount | Subsidiaries |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | 19,583 | 19,080
CECONY | Fair Value | Subsidiaries |  |
Debt Instrument [Line Items] |  |
Long-Term Debt (including current portion) | $ 16,213 | 16,699
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

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