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Other Postretirement Benefits - Schedule of Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | $ 326 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 397 | $ 326 |
CECONY |  |  |
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 301 |  |
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 371 | 301 |
Other Postretirement Benefits |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 1,114 | 1,219 | $ 1,198
Service cost | 18 | 20 | 20
Interest cost on accumulated other postretirement benefit obligation | 44 | 42 | 46
Amendments | (14) | 0 | 0
Net actuarial loss/(gain) | 264 | (70) | 53
Benefits paid and administrative expenses, net of subsidies | (110) | (135) | (134)
Participant contributions | 41 | 38 | 36
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 1,357 | 1,114 | 1,219
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 885 | 1,039 | 975
Actual return on plan assets | 198 | (66) | 150
Employer contributions | 7 | 6 | 17
Employer group waiver plan subsidies | 23 | 34 | 34
Participant contributions | 40 | 37 | 35
Benefits paid | (127) | (165) | (172)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 1,026 | 885 | 1,039
FUNDED STATUS | (331) | (229) | (180)
Unrecognized net loss/(gain) | 155 | 14 | (47)
Unrecognized prior service costs | (19) | (8) | (14)
Other Postretirement Benefits | CECONY |  |  |
CHANGE IN BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 913 | 985 | 1,007
Service cost | 13 | 14 | 13
Interest cost on accumulated other postretirement benefit obligation | 36 | 34 | 38
Amendments | 0 | 0 | 0
Net actuarial loss/(gain) | 252 | (32) | 16
Benefits paid and administrative expenses, net of subsidies | (100) | (125) | (124)
Participant contributions | 40 | 37 | 35
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 1,154 | 913 | 985
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 759 | 893 | 851
Actual return on plan assets | 165 | (54) | 130
Employer contributions | 6 | 6 | 8
Employer group waiver plan subsidies | 22 | 32 | 30
Participant contributions | 40 | 37 | 35
Benefits paid | (120) | (155) | (161)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 872 | 759 | 893
FUNDED STATUS | (282) | (154) | (92)
Unrecognized net loss/(gain) | 149 | (2) | (85)
Unrecognized prior service costs | $ (3) | $ (5) | $ (7)

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