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Pension Benefits - Schedule of Funded Status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CHANGE IN PLAN ASSETS      
Fair value of plan assets at beginning of year $ 330    
FAIR VALUE OF PLAN ASSETS AT END OF YEAR 326 $ 330  
Pension Benefits      
CHANGE IN PROJECTED BENEFIT OBLIGATION      
Projected benefit obligation at beginning of year 15,536 14,095 $ 14,377
Service cost – excluding administrative expenses 286 259 271
Interest cost on projected benefit obligation 561 591 596
Net actuarial loss/(gain) (1,219) 1,231 (302)
Plan amendments 0 6 (256)
Benefits paid (715) (646) (591)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR 14,449 15,536 14,095
CHANGE IN PLAN ASSETS      
Fair value of plan assets at beginning of year 14,274 12,472 11,759
Actual return on plan assets (536) 2,041 829
Employer contributions 473 450 508
Benefits paid (715) (646) (591)
Administrative expenses (46) (43) (33)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR 13,450 14,274 12,472
FUNDED STATUS (999) (1,262) (1,623)
Unrecognized net loss 2,464 2,760 3,157
Unrecognized prior service costs (205) (223) (244)
Accumulated benefit obligation 13,030 13,897 12,655
CECONY      
CHANGE IN PLAN ASSETS      
Fair value of plan assets at beginning of year 301    
FAIR VALUE OF PLAN ASSETS AT END OF YEAR 301 301  
CECONY | Pension Benefits      
CHANGE IN PROJECTED BENEFIT OBLIGATION      
Projected benefit obligation at beginning of year 14,567 13,203 13,482
Service cost – excluding administrative expenses 267 241 254
Interest cost on projected benefit obligation 525 554 559
Net actuarial loss/(gain) (1,159) 1,171 (282)
Plan amendments 0 0 (259)
Benefits paid (658) (602) (551)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR 13,542 14,567 13,203
CHANGE IN PLAN ASSETS      
Fair value of plan assets at beginning of year 13,519 11,815 11,141
Actual return on plan assets (507) 1,935 787
Employer contributions 434 412 469
Benefits paid (658) (602) (551)
Administrative expenses (44) (41) (31)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR 12,744 13,519 11,815
FUNDED STATUS (798) (1,048) (1,388)
Unrecognized net loss 2,338 2,624 2,995
Unrecognized prior service costs (222) (242) (258)
Accumulated benefit obligation $ 12,161 $ 12,972 $ 11,806