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Other Postretirement Benefits - Schedule of Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | $ 524 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 583 | $ 524 |
CECONY |  |  |
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 502 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 560 | 502 |
Other Postretirement Benefits |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 963 | 1,058 | $ 1,398
Service cost | 13 | 14 | 18
Interest cost on accumulated other postretirement benefit obligation | 47 | 57 | 35
Net actuarial gain | (57) | (93) | (311)
Benefits paid and administrative expenses, net of subsidies | (120) | (128) | (130)
Participant contributions | 52 | 55 | 48
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 898 | 963 | 1,058
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 929 | 860 | 1,150
Actual return on plan assets | 56 | 116 | (225)
Employer contributions | 13 | 22 | 13
Employer group waiver plan subsidies | 66 | 56 | 55
Participant contributions | 52 | 55 | 48
Benefits paid | (182) | (180) | (181)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 934 | 929 | 860
FUNDED STATUS | 36 | (34) | (198)
Unrecognized net loss/(gain) | (119) | (90) | 37
Unrecognized prior service costs | (9) | (10) | (12)
Other Postretirement Benefits | CECONY |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 825 | 921 | 1,189
Service cost | 10 | 12 | 15
Interest cost on accumulated other postretirement benefit obligation | 40 | 49 | 30
Net actuarial gain | (38) | (94) | (239)
Benefits paid and administrative expenses, net of subsidies | (112) | (118) | (121)
Participant contributions | 50 | 55 | 47
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 775 | 825 | 921
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 750 | 708 | 955
Actual return on plan assets | 44 | 84 | (187)
Employer contributions | 10 | 17 | 10
Employer group waiver plan subsidies | 60 | 52 | 50
Participant contributions | 50 | 55 | 47
Benefits paid | (170) | (166) | (167)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 744 | 750 | 708
FUNDED STATUS | (31) | (75) | (213)
Unrecognized net loss/(gain) | (57) | (41) | 78
Unrecognized prior service costs | $ 0 | $ 0 | $ 0

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