v3.26.1
Pension Benefits - Schedule of Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Service cost – including administrative expenses $ 45 $ 42 $ 90 $ 84
Interest cost on projected benefit obligation 167 170 334 338
Expected return on plan assets (261) (279) (523) (558)
Recognition of net actuarial gain (22) (67) (44) (133)
Recognition of prior service credit (5) (5) (9) (9)
TOTAL PERIODIC OTHER POSTRETIREMENT CREDIT (76) (139) (152) (278)
Cost capitalized (28) (24) (54) (45)
Reconciliation to rate level (38) (13) (79) (29)
Total credit recognized (142) (176) (285) (352)
CECONY | Subsidiaries        
Defined Benefit Plan Disclosure [Line Items]        
Service cost – including administrative expenses 43 40 86 79
Interest cost on projected benefit obligation 157 159 315 318
Expected return on plan assets (251) (267) (502) (533)
Recognition of net actuarial gain (21) (63) (43) (126)
Recognition of prior service credit (5) (5) (10) (10)
TOTAL PERIODIC OTHER POSTRETIREMENT CREDIT (77) (136) (154) (272)
Cost capitalized (26) (22) (51) (42)
Reconciliation to rate level (38) (14) (78) (30)
Total credit recognized $ (141) $ (172) $ (283) $ (344)