Derivative Instruments and Hedging Activities - Schedule of Aggregate Fair Value of Companies' Derivative Instruments with Credit-Risk-Related Contingent Features (Details) $ in Millions	Dec. 31, 2025 USD ($)
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	$ 28
Collateral posted	2
Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	3
Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	41
Derivatives in net asset position additional cash collateral	2
Additional Collateral Required Due To Loss Of Unsecured Credit
Derivatives, Fair Value [Line Items]
Collateral posted	83
CECONY
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	23
Collateral posted	0
CECONY \| Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	2
CECONY \| Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	$ 35

The additional collateral that would be required for derivative instruments that are net assets.

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- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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- Definition

Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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