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Stock-Based Compensation - Summary of Changes in Status of Performance RSUs' (Details) - Performance RSUs	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Units
Non-vested at beginning of period (in shares) | shares	1,005,836
Granted (in shares) | shares	389,600
Vested (in shares) | shares	(357,325)
Forfeited (in shares) | shares	(46,873)
Transferred (in shares) | shares	0
Non-vested at end of period (in shares) | shares	991,238
CECONY
Units
Non-vested at beginning of period (in shares) | shares	761,906
Granted (in shares) | shares	284,516
Vested (in shares) | shares	(275,376)
Forfeited (in shares) | shares	(30,186)
Transferred (in shares) | shares	1,344
Non-vested at end of period (in shares) | shares	742,204
TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 74.81
Granted (in dollars per share)	64.37
Vested (in dollars per share)	83.17
Forfeited (in dollars per share)	65.08
Transferred (in dollars per share)	0
Non-vested at end of period (in dollars per share)	$ 68.15
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)	$ 74.47
Granted (in dollars per share)	64.82
Vested (in dollars per share)	82.77
Forfeited (in dollars per share)	65.20
Transferred (in dollars per share)	70.04
Non-vested at end of period (in dollars per share)	68.06
Non-TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	74.27
Granted (in dollars per share)	80.03
Vested (in dollars per share)	72.09
Forfeited (in dollars per share)	78.03
Transferred (in dollars per share)	0
Non-vested at end of period (in dollars per share)	$ 77.14
Adjustment percentage used for Performance awards	0.00%
Non-TSR Portion | CECONY
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 74.42
Granted (in dollars per share)	80.31
Vested (in dollars per share)	72.32
Forfeited (in dollars per share)	78.10
Transferred (in dollars per share)	75.65
Non-vested at end of period (in dollars per share)	$ 77.32

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Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Transferred In Period

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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