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Stock-Based Compensation - Summary of Changes in Status of Performance RSUs' (Details) - Performance RSUs
12 Months Ended
Dec. 31, 2024
$ / shares
shares
Units  
Non-vested at beginning of period (in shares) | shares 838,303
Granted (in shares) | shares 296,250
Vested (in shares) | shares (365,756)
Forfeited (in shares) | shares (47,996)
Transferred (in shares) | shares 0
Non-vested at end of period (in shares) | shares 720,801
CECONY  
Units  
Non-vested at beginning of period (in shares) | shares 638,473
Granted (in shares) | shares 246,221
Vested (in shares) | shares (272,859)
Forfeited (in shares) | shares (38,242)
Transferred (in shares) | shares (12,186)
Non-vested at end of period (in shares) | shares 561,407
TSR Portion  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) $ 83.70
Granted (in dollars per share) 88.25
Vested (in dollars per share) 74.36
Forfeited (in dollars per share) 88.48
Transferred (in dollars per share) 0
Non-vested at end of period (in dollars per share) $ 89.99
Adjustment percentage used for Performance awards 50.00%
TSR Portion | CECONY  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) $ 83.94
Granted (in dollars per share) 87.96
Vested (in dollars per share) 74.10
Forfeited (in dollars per share) 88.78
Transferred (in dollars per share) 90.81
Non-vested at end of period (in dollars per share) 90.01
Non-TSR Portion  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) 80.40
Granted (in dollars per share) 88.03
Vested (in dollars per share) 71.12
Forfeited (in dollars per share) 85.20
Transferred (in dollars per share) 0
Non-vested at end of period (in dollars per share) $ 87.93
Adjustment percentage used for Performance awards 50.00%
Non-TSR Portion | CECONY  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) $ 80.97
Granted (in dollars per share) 88.17
Vested (in dollars per share) 71.36
Forfeited (in dollars per share) 85.73
Transferred (in dollars per share) 86.84
Non-vested at end of period (in dollars per share) $ 88.35