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Other Postretirement Benefits - Schedule of Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | $ 397 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 465 | $ 397 |
CECONY |  |  |
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 371 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 439 | 371 |
Other Postretirement Benefits |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 1,357 | 1,114 | $ 1,219
Service cost | 21 | 18 | 20
Interest cost on accumulated other postretirement benefit obligation | 37 | 44 | 42
Amendments | 0 | (14) | 0
Net actuarial loss/(gain) | 74 | 264 | (70)
Benefits paid and administrative expenses, net of subsidies | (117) | (110) | (135)
Participant contributions | 53 | 41 | 38
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 1,425 | 1,357 | 1,114
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 1,026 | 885 | 1,039
Actual return on plan assets | 142 | 198 | (66)
Employer contributions | 7 | 7 | 6
Employer group waiver plan subsidies | 20 | 23 | 34
Participant contributions | 53 | 40 | 37
Benefits paid | (133) | (127) | (165)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 1,115 | 1,026 | 885
FUNDED STATUS | (310) | (331) | (229)
Unrecognized net loss/(gain) | 115 | 155 | 14
Unrecognized prior service costs | (16) | (19) | (8)
Other Postretirement Benefits | CECONY |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 1,154 | 913 | 985
Service cost | 16 | 13 | 14
Interest cost on accumulated other postretirement benefit obligation | 31 | 36 | 34
Amendments | 0 | 0 | 0
Net actuarial loss/(gain) | 63 | 252 | (32)
Benefits paid and administrative expenses, net of subsidies | (107) | (100) | (125)
Participant contributions | 52 | 40 | 37
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 1,209 | 1,154 | 913
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 872 | 759 | 893
Actual return on plan assets | 117 | 165 | (54)
Employer contributions | 4 | 6 | 6
Employer group waiver plan subsidies | 19 | 22 | 32
Participant contributions | 51 | 40 | 37
Benefits paid | (123) | (120) | (155)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 940 | 872 | 759
FUNDED STATUS | (269) | (282) | (154)
Unrecognized net loss/(gain) | 114 | 149 | (2)
Unrecognized prior service costs | $ (1) | $ (3) | $ (5)

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