Pension Benefits - Schedule of Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	$ 167	$ 177	$ 161
Interest cost on projected benefit obligation	675	642	649
Expected return on plan assets	(1,116)	(1,129)	(1,114)
Recognition of net actuarial gain	(265)	(5)	(232)
Recognition of prior service credit	(17)	(17)	(17)
TOTAL PERIODIC BENEFIT CREDIT	(556)	(332)	(553)
Cost capitalized	(92)	(94)	(81)
Reconciliation to rate level	(54)	55	282
Total benefit recognized	(702)	(371)	(352)
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	158	167	151
Interest cost on projected benefit obligation	636	604	611
Expected return on plan assets	(1,066)	(1,076)	(1,061)
Recognition of net actuarial gain	(253)	(7)	(219)
Recognition of prior service credit	(20)	(19)	(19)
TOTAL PERIODIC BENEFIT CREDIT	(545)	(331)	(537)
Cost capitalized	(88)	(90)	(78)
Reconciliation to rate level	(55)	43	261
Total benefit recognized	$ (688)	$ (378)	$ (354)