Environmental Matters - Schedule of Accrued Liability (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Site Contingency [Line Items] | ||
| Regulatory assets | $ 5,952 | $ 5,702 |
| Regulatory liabilities | 5,658 | 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 | 50 | 51 |
| Regulatory liabilities | 23 | 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 | 48 | 49 |
| Regulatory liabilities | $ 23 | $ 21 |
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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