Stock-Based Compensation - Summary of Changes in Status of Time-Based Awards (Details) - Time-based Awards	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Units
Non-vested at beginning of period (in shares) | shares	67,438
Granted (in shares) | shares	17,150
Vested (in shares) | shares	(21,121)
Forfeited (in shares) | shares	(1,847)
Non-vested at end of period (in shares) | shares	61,620
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 80.40
Granted (in dollars per share) | $ / shares	74.80
Vested (in dollars per share) | $ / shares	77.96
Forfeited (in dollars per share) | $ / shares	80.23
Non-vested at end of period (in dollars per share) | $ / shares	$ 79.68
CECONY
Units
Non-vested at beginning of period (in shares) | shares	62,838
Granted (in shares) | shares	16,200
Vested (in shares) | shares	(19,588)
Forfeited (in shares) | shares	(1,580)
Non-vested at end of period (in shares) | shares	57,870
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 80.42
Granted (in dollars per share) | $ / shares	74.80
Vested (in dollars per share) | $ / shares	77.95
Forfeited (in dollars per share) | $ / shares	79.89
Non-vested at end of period (in dollars per share) | $ / shares	$ 79.70