Derivative Instruments and Hedging Activities - Schedule of Credit-Risk-Related Contingent Features (Details) $ in Millions	Mar. 31, 2026 USD ($)
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	$ 9
Collateral posted	2
Additional collateral (downgrade to below investment grade from current ratings)	2
Derivatives in net asset position additional collateral	50
Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral (downgrade one level from current ratings)	1
Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral (downgrade one level from current ratings)	47
CECONY \| Subsidiaries
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	8
Collateral posted	0
CECONY \| Downgrade One Level from Current Ratings \| Subsidiaries
Derivatives, Fair Value [Line Items]
Additional collateral (downgrade one level from current ratings)	0
CECONY \| Downgrade to Below Investment Grade from Current Ratings \| Subsidiaries
Derivatives, Fair Value [Line Items]
Additional collateral (downgrade one level from current ratings)	$ 43

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

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- Definition

Additional Collateral For Non-Derivative Transactions Without Extended Unsecured Credit

+ References

No definition available.

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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.

+ References

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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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