Income Tax - Income Tax Reconciliation (Details)	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
STATUTORY TAX RATE
Federal	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax, net of federal income tax benefit	5.00%	5.00%
Amortization of excess deferred federal income taxes	(3.00%)	(6.00%)
Taxes attributable to non-controlling interest	0.00%	2.00%
Cost of removal	0.00%	1.00%
Renewable energy credits	0.00%	(1.00%)
Allowance for uncollectible accounts, net of COVID-19 assistance	0.00%	0.00%
Deferred unamortized ITC recognized on sale of subsidiary	(0.07)	0
Changes in state apportionments, net of federal income taxes	(0.03)	0
Valuation allowance on state NOLs, net of federal income tax	1.00%	0.00%
Effective tax rate	14.00%	22.00%
CECONY \| Subsidiaries
STATUTORY TAX RATE
Federal	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax, net of federal income tax benefit	5.00%	5.00%
Amortization of excess deferred federal income taxes	(6.00%)	(7.00%)
Taxes attributable to non-controlling interest	0.00%	0.00%
Cost of removal	1.00%	1.00%
Renewable energy credits	0.00%	0.00%
Allowance for uncollectible accounts, net of COVID-19 assistance	(1.00%)	0.00%
Deferred unamortized ITC recognized on sale of subsidiary	0	0
Changes in state apportionments, net of federal income taxes	0	0
Valuation allowance on state NOLs, net of federal income tax	0.00%	0.00%
Effective tax rate	20.00%	20.00%

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

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Effective Income Tax Rate Reconciliation, Change In State Apportionments, 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, Nondeductible Expense, Amortization Of Excess Deferred Federal Income Taxes, 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 changes in the valuation allowance for deferred tax assets.

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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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