Stock-Based Compensation - Summary of Changes in Status of Performance RSUs' (Details) - Performance RSUs	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Units
Non-vested at beginning of period (in shares) | shares	865,091
Granted (in shares) | shares	266,200
Vested (in shares) | shares	(264,568)
Forfeited (in shares) | shares	(28,420)
Non-vested at end of period (in shares) | shares	838,303
CECONY
Units
Non-vested at beginning of period (in shares) | shares	647,826
Granted (in shares) | shares	204,466
Vested (in shares) | shares	(205,078)
Forfeited (in shares) | shares	(8,741)
Non-vested at end of period (in shares) | shares	638,473
TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 80.02
Granted (in dollars per share)	91.93
Vested (in dollars per share)	79.69
Forfeited (in dollars per share)	86.23
Non-vested at end of period (in dollars per share)	$ 83.70
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)	$ 79.89
Granted (in dollars per share)	92.27
Vested (in dollars per share)	79.40
Forfeited (in dollars per share)	85.24
Non-vested at end of period (in dollars per share)	83.94
Non-TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	80.04
Granted (in dollars per share)	90.93
Vested (in dollars per share)	89.62
Forfeited (in dollars per share)	82.22
Non-vested at end of period (in dollars per share)	$ 80.40
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)	$ 80.16
Granted (in dollars per share)	91.34
Vested (in dollars per share)	88.75
Forfeited (in dollars per share)	81.02
Non-vested at end of period (in dollars per share)	$ 80.97