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Pension 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 |
Pension Benefits |  |  |
CHANGE IN PROJECTED BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 18,965 | 16,792 | $ 14,449
Service cost – excluding administrative expenses | 337 | 288 | 245
Interest cost on projected benefit obligation | 471 | 549 | 601
Net actuarial loss/(gain) | (1,547) | 2,281 | 2,191
Plan amendments | 0 | 0 | 15
Benefits paid | (869) | (945) | (709)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 17,357 | 18,965 | 16,792
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 17,022 | 15,608 | 13,450
Actual return on plan assets | 1,935 | 1,927 | 2,556
Employer contributions | 469 | 475 | 350
Benefits paid | (869) | (945) | (709)
Administrative expenses | (53) | (43) | (39)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 18,504 | 17,022 | 15,608
FUNDED STATUS | 1,147 | (1,943) | (1,184)
Unrecognized net loss | 205 | 3,330 | 2,604
Unrecognized prior service costs/(credits) | (140) | (156) | (173)
Accumulated benefit obligation | 15,469 | 16,768 | 15,015
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 |
CECONY | Pension Benefits |  |  |
CHANGE IN PROJECTED BENEFIT OBLIGATION |  |  |
Projected benefit obligation at beginning of year | 17,821 | 15,750 | 13,542
Service cost – excluding administrative expenses | 317 | 269 | 228
Interest cost on projected benefit obligation | 443 | 515 | 564
Net actuarial loss/(gain) | (1,441) | 2,154 | 2,076
Plan amendments | 0 | 0 | 0
Benefits paid | (799) | (867) | (660)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR | 16,341 | 17,821 | 15,750
CHANGE IN PLAN ASSETS |  |  |
Fair value of plan assets at beginning of year | 16,147 | 14,790 | 12,744
Actual return on plan assets | 1,838 | 1,830 | 2,425
Employer contributions | 432 | 435 | 318
Benefits paid | (799) | (867) | (660)
Administrative expenses | (52) | (41) | (37)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR | 17,566 | 16,147 | 14,790
FUNDED STATUS | 1,225 | (1,674) | (960)
Unrecognized net loss | 207 | 3,145 | 2,466
Unrecognized prior service costs/(credits) | (163) | (183) | (202)
Accumulated benefit obligation | $ 14,504 | $ 15,676 | $ 14,010

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