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Other Postretirement Benefits - Schedule of Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | $ 525 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 459 | $ 525 |
CECONY |  |  |
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 499 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 439 | 499 |
Other Postretirement Benefits |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 1,398 | 1,425 | $ 1,357
Service cost | 18 | 22 | 21
Interest cost on accumulated other postretirement benefit obligation | 35 | 33 | 37
Net actuarial loss/(gain) | (311) | (13) | 74
Benefits paid and administrative expenses, net of subsidies | (130) | (117) | (117)
Participant contributions | 48 | 48 | 53
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 1,058 | 1,398 | 1,425
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 1,150 | 1,115 | 1,026
Actual return on plan assets | (225) | 92 | 142
Employer contributions | 13 | 6 | 7
Employer group waiver plan subsidies | 55 | 21 | 20
Participant contributions | 48 | 48 | 53
Benefits paid | (181) | (132) | (133)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 860 | 1,150 | 1,115
FUNDED STATUS | (198) | (248) | (310)
Unrecognized net loss/(gain) | 37 | 41 | 115
Unrecognized prior service costs | (12) | (13) | (16)
Other Postretirement Benefits | CECONY |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 1,189 | 1,209 | 1,154
Service cost | 15 | 16 | 16
Interest cost on accumulated other postretirement benefit obligation | 30 | 28 | 31
Net actuarial loss/(gain) | (239) | (3) | 63
Benefits paid and administrative expenses, net of subsidies | (121) | (107) | (107)
Participant contributions | 47 | 46 | 52
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 921 | 1,189 | 1,209
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 955 | 940 | 872
Actual return on plan assets | (187) | 67 | 117
Employer contributions | 10 | 3 | 4
Employer group waiver plan subsidies | 50 | 19 | 19
Participant contributions | 47 | 46 | 51
Benefits paid | (167) | (120) | (123)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 708 | 955 | 940
FUNDED STATUS | (213) | (234) | (269)
Unrecognized net loss/(gain) | 78 | 67 | 114
Unrecognized prior service costs | $ 0 | $ 0 | $ (1)

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