Pension Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension liability	$ 445	$ 174
Current liabilities	6,433	6,462
Investments value	583	524
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory liabilities	(86)
Charge to OCI	5
Current liabilities	63
Noncurrent liabilities	319	337	$ 311
Investments value	15,278	15,404	14,979	$ 18,504
Accumulated benefit obligation	11,236	11,739	11,167
Estimated future employer contributions	3
Other Nonqualified Supplemental Defined Benefit Pension
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	380	349
CECONY
Defined Benefit Plan Disclosure [Line Items]
Pension liability	459	156
Current liabilities	5,559	5,694
Investments value	560	502
CECONY | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory liabilities	(101)
Charge to OCI	7
Current liabilities	60
Noncurrent liabilities	296	313	287
Investments value	14,591	14,674	14,248	$ 17,566
Accumulated benefit obligation	10,554	11,031	$ 10,478
CECONY | Other Nonqualified Supplemental Defined Benefit Pension
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 354	$ 323