Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	$ 287	$ 343	$ 293
Interest cost on projected benefit obligation	505	471	549
Expected return on plan assets	(1,168)	(1,096)	(1,034)
Recognition of net actuarial loss	377	787	699
Recognition of prior service credit	(16)	(17)	(16)
TOTAL PERIODIC BENEFIT COST	(15)	488	491
Cost capitalized	(137)	(154)	(130)
Reconciliation to rate level	259	(226)	(250)
Total credit recognized	107	108	111
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	270	321	274
Interest cost on projected benefit obligation	475	443	515
Expected return on plan assets	(1,109)	(1,040)	(980)
Recognition of net actuarial loss	358	746	661
Recognition of prior service credit	(21)	(19)	(19)
TOTAL PERIODIC BENEFIT COST	(27)	451	451
Cost capitalized	(129)	(146)	(123)
Reconciliation to rate level	245	(216)	(239)
Total credit recognized	$ 89	$ 89	$ 89