Income Tax - Income Tax Reconciliation (Details)	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
STATUTORY TAX RATE
Federal	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax, net of federal income taxes	5.00%	5.00%
Amortization of excess deferred federal income taxes	(6.00%)	(3.00%)
Cost of removal	1.00%	0.00%
Allowance for uncollectible accounts, net of COVID-19 assistance	(1.00%)	0.00%
Deferred unamortized ITC recognized on sale of subsidiary	0	(0.07)
Changes in state apportionments, net of federal income taxes	0	(0.03)
Valuation allowance on state NOLs, net of federal income tax	0.00%	1.00%
Effective tax rate	20.00%	14.00%
CECONY \| Subsidiaries
STATUTORY TAX RATE
Federal	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax, net of federal income taxes	5.00%	5.00%
Amortization of excess deferred federal income taxes	(5.00%)	(6.00%)
Cost of removal	1.00%	1.00%
Allowance for uncollectible accounts, net of COVID-19 assistance	(1.00%)	(1.00%)
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	21.00%	20.00%

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

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Effective Income Tax Rate Reconciliation, Changes 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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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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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-Section 50
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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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