Stock-Based Compensation - Summary of Changes in Status of Performance RSUs' (Details) - Performance RSUs	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Units
Non-vested at beginning of period (in shares) | shares	984,728
Granted (in shares) | shares	231,600
Vested (in shares) | shares	(320,821)
Forfeited (in shares) | shares	(30,416)
Non-vested at end of period (in shares) | shares	865,091
CECONY
Units
Non-vested at beginning of period (in shares) | shares	744,278
Granted (in shares) | shares	172,003
Vested (in shares) | shares	(240,022)
Forfeited (in shares) | shares	(28,433)
Non-vested at end of period (in shares) | shares	647,826
TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 72.67
Granted (in dollars per share)	89.90
Vested (in dollars per share)	64.59
Forfeited (in dollars per share)	80.08
Non-vested at end of period (in dollars per share)	$ 80.02
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)	$ 72.71
Granted (in dollars per share)	90.25
Vested (in dollars per share)	65.04
Forfeited (in dollars per share)	80.04
Non-vested at end of period (in dollars per share)	79.89
Non-TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	79.14
Granted (in dollars per share)	83.76
Vested (in dollars per share)	80.17
Forfeited (in dollars per share)	77.73
Non-vested at end of period (in dollars per share)	$ 80.04
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)	$ 79.20
Granted (in dollars per share)	84.32
Vested (in dollars per share)	80.45
Forfeited (in dollars per share)	77.68
Non-vested at end of period (in dollars per share)	$ 80.16