Pension Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Pension liability	$ 1,719	$ 3,090
Investments value	459	525
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Regulatory assets and liabilities for future income taxes, net	1,655
Charge to OCI	15
Noncurrent liabilities	311	459
Investments value	14,979	18,504	$ 17,022	$ 15,608
Accumulated benefit obligation	11,167	15,469	16,768
Estimated future employer contributions	10
Other Nonqualified Supplemental Defined Benefit Pension
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	306	386
CECONY
Defined Benefit Plan Disclosure [Line Items]
Pension liability	1,628	2,899
Investments value	439	499
CECONY | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Regulatory assets and liabilities for future income taxes, net	1,579
Charge to OCI	3
Noncurrent liabilities	287	381
Investments value	14,248	17,566	16,147	$ 14,790
Accumulated benefit obligation	10,478	14,504	$ 15,676
Estimated future employer contributions	8
CECONY | Other Nonqualified Supplemental Defined Benefit Pension
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 280	$ 352