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Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Service cost – including administrative expenses $ 177 $ 161 $ 287
Interest cost on projected benefit obligation 642 649 505
Expected return on plan assets (1,129) (1,114) (1,168)
Recognition of net actuarial loss/(gain) (5) (232) 377
Recognition of prior service credit (17) (17) (16)
TOTAL PERIODIC BENEFIT COST/(CREDIT) (332) (553) (15)
Cost capitalized (94) (81) (137)
Reconciliation to rate level 55 282 259
Total credit recognized (371) (352) 107
CECONY      
Defined Benefit Plan Disclosure [Line Items]      
Service cost – including administrative expenses 167 151 270
Interest cost on projected benefit obligation 604 611 475
Expected return on plan assets (1,076) (1,061) (1,109)
Recognition of net actuarial loss/(gain) (7) (219) 358
Recognition of prior service credit (19) (19) (21)
TOTAL PERIODIC BENEFIT COST/(CREDIT) (331) (537) (27)
Cost capitalized (90) (78) (129)
Reconciliation to rate level 43 261 245
Total credit recognized $ (378) $ (354) $ 89