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Regulatory Matters - Regulatory Assets and Liabilities Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Regulatory Assets [Line Items] |  |
Regulatory liabilities | $ 5,444 | $ 5,328
Other customer-provided capital rate | 5.95% | 5.20%
Return on regulatory assets | $ 3,262 | $ 2,541
Deferred derivative losses, current, recovery period (in years) | 1 year |
Deferred derivative losses, noncurrent, recovery period (in years) | 3 years |
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory liabilities | $ 4,940 | 4,818
Return on regulatory assets | $ 3,024 | 2,359
CECONY | Commodity |  |
Regulatory Assets [Line Items] |  |
Regulatory assets, recovery period | 4 years |
RECO |  |
Regulatory Assets [Line Items] |  |
Return on regulatory assets | $ 28 | 24
Net unbilled revenue deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory liabilities | $ 436 | $ 278

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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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