Environmental Matters - Schedule of Accrued Liability (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Site Contingency [Line Items]
Regulatory assets	$ 6,035	$ 5,702
Regulatory liabilities	5,376	5,623
Asbestos Suits
Site Contingency [Line Items]
Accrued liability	11	11
Regulatory assets	11	11
Workers' Compensation Insurance
Site Contingency [Line Items]
Accrued liability	51	51
Regulatory liabilities	21	21
CECONY \| Asbestos Suits
Site Contingency [Line Items]
Accrued liability	10	10
Regulatory assets	10	10
CECONY \| Workers' Compensation Insurance
Site Contingency [Line Items]
Accrued liability	49	49
Regulatory liabilities	$ 21	$ 21

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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