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Other Postretirement Benefits - Schedule of Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | $ 465 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 525 | $ 465 |
CECONY |  |  |
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 439 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 499 | 439 |
Other Postretirement Benefits |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 1,425 | 1,357 | $ 1,114
Service cost | 22 | 21 | 18
Interest cost on accumulated other postretirement benefit obligation | 33 | 37 | 44
Amendments | 0 | 0 | (14)
Net actuarial loss/(gain) | (13) | 74 | 264
Benefits paid and administrative expenses, net of subsidies | (117) | (117) | (110)
Participant contributions | 48 | 53 | 41
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 1,398 | 1,425 | 1,357
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 1,115 | 1,026 | 885
Actual return on plan assets | 92 | 142 | 198
Employer contributions | 6 | 7 | 7
Employer group waiver plan subsidies | 21 | 20 | 23
Participant contributions | 48 | 53 | 40
Benefits paid | (132) | (133) | (127)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 1,150 | 1,115 | 1,026
FUNDED STATUS | (248) | (310) | (331)
Unrecognized net loss/(gain) | 41 | 115 | 155
Unrecognized prior service costs | (13) | (16) | (19)
Other Postretirement Benefits | CECONY |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 1,209 | 1,154 | 913
Service cost | 16 | 16 | 13
Interest cost on accumulated other postretirement benefit obligation | 28 | 31 | 36
Amendments | 0 | 0 | 0
Net actuarial loss/(gain) | (3) | 63 | 252
Benefits paid and administrative expenses, net of subsidies | (107) | (107) | (100)
Participant contributions | 46 | 52 | 40
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 1,189 | 1,209 | 1,154
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 940 | 872 | 759
Actual return on plan assets | 67 | 117 | 165
Employer contributions | 3 | 4 | 6
Employer group waiver plan subsidies | 19 | 19 | 22
Participant contributions | 46 | 51 | 40
Benefits paid | (120) | (123) | (120)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 955 | 940 | 872
FUNDED STATUS | (234) | (269) | (282)
Unrecognized net loss/(gain) | 67 | 114 | 149
Unrecognized prior service costs | $ 0 | $ (1) | $ (3)

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