Income Tax - Income Tax Reconciliation (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax, net of federal income tax benefit	2.00%	7.00%	4.00%	6.00%
Taxes attributable to non-controlling interest			0.00%	1.00%
Amortization of excess deferred federal income taxes	(17.00%)	(17.00%)	(5.00%)	(9.00%)
Cost of removal	4.00%	3.00%	1.00%	1.00%
Other plant-related items	(1.00%)	(1.00%)	0.00%	(1.00%)
Renewable energy credits	(1.00%)	(4.00%)	0.00%	(2.00%)
Allowance for uncollectible accounts, net of COVID-19 assistance	0.00%	(2.00%)
Injuries and damages reserve	1.00%	0.00%
Reserve for uncertain tax positions	0.00%	2.00%	0.00%	1.00%
Remeasurement of deferred income taxes	4.00%	0.00%	1.00%	0.00%
Research and development credits	(1.00%)	(3.00%)	0.00%	(1.00%)
Other	0.00%	0.00%
Deferred unamortized ITC recognized on sale of subsidiary			(0.06)	0
Gain on sale of subsidiary			(0.02)	0
Effective tax rate	12.00%	6.00%	14.00%	17.00%
CECONY \| Subsidiaries
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax, net of federal income tax benefit	5.00%	5.00%	5.00%	5.00%
Taxes attributable to non-controlling interest			0.00%	0.00%
Amortization of excess deferred federal income taxes	(18.00%)	(27.00%)	(8.00%)	(12.00%)
Cost of removal	4.00%	4.00%	2.00%	2.00%
Other plant-related items	(1.00%)	(2.00%)	(1.00%)	(1.00%)
Renewable energy credits	0.00%	0.00%	0.00%	0.00%
Allowance for uncollectible accounts, net of COVID-19 assistance	0.00%	(3.00%)
Injuries and damages reserve	1.00%	1.00%
Reserve for uncertain tax positions	0.00%	0.00%	0.00%	0.00%
Remeasurement of deferred income taxes	4.00%	0.00%	1.00%	0.00%
Research and development credits	(1.00%)	(4.00%)	(1.00%)	(1.00%)
Other	0.00%	(1.00%)
Deferred unamortized ITC recognized on sale of subsidiary			0	0
Gain on sale of subsidiary			0	0
Effective tax rate	15.00%	(6.00%)	19.00%	14.00%

Effective Income Tax Rate Reconciliation, Change in Allowance For Uncollectible Accounts, Percent

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Effective Income Tax Rate Reconciliation, cost of removal

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Effective Income Tax Rate Reconciliation, Federal Deferred Unamortized ITC Recognized On Sale Of Subsidiary, Percent

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Effective Income Tax Rate Reconciliation, Tax Credit, Renewable Energy Credits, Percent

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Federal Statutory Income Tax Rate [Abstract]

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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