Income Tax - Schedule of Income Tax Reconciliation (Details)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income taxes, net of federal income tax benefit	6.00%	4.00%	4.00%
Taxes attributable to noncontrolling interests	1.00%	3.00%	(1.00%)
Cost of removal	1.00%	2.00%	2.00%
Other plant-related items	0.00%	(1.00%)	(1.00%)
Amortization of excess deferred federal income taxes	(9.00%)	(12.00%)	(14.00%)
Renewable energy credits	(2.00%)	(2.00%)	(3.00%)
Research and development credits	0.00%	(1.00%)	0.00%
Remeasurement of accumulated deferred state income taxes, net of federal income tax benefit	0.06	0	0
Other	0.00%	0.00%	(1.00%)
Effective tax rate	24.00%	14.00%	7.00%
CECONY
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income taxes, net of federal income tax benefit	5.00%	5.00%	5.00%
Taxes attributable to noncontrolling interests	0.00%	0.00%	0.00%
Cost of removal	1.00%	1.00%	1.00%
Other plant-related items	(1.00%)	(1.00%)	(1.00%)
Amortization of excess deferred federal income taxes	(10.00%)	(11.00%)	(12.00%)
Renewable energy credits	0.00%	0.00%	0.00%
Research and development credits	0.00%	0.00%	0.00%
Remeasurement of accumulated deferred state income taxes, net of federal income tax benefit	0	0	0
Other	0.00%	0.00%	1.00%
Effective tax rate	16.00%	15.00%	15.00%

Effective Income Tax Rate Reconciliation, cost of removal

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Effective Income Tax Rate Reconciliation, Deductible Expense Amortization Of Excess Deferred Income Taxes, Percent

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Effective Income Tax Rate Reconciliation, Deferred State And Local Income Taxes, Re-Measurement, 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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