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Regulatory Matters - Regulatory Assets and Liabilities Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Regulatory Assets [Line Items] |  |
Regulatory liabilities | $ 5,328 | $ 6,027
Other customer-provided capital rate | 5.20% | 1.75%
Return on regulatory assets | $ 2,541 | $ 2,304
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 | $ 4,818 | 5,481
Return on regulatory assets | $ 2,359 | 2,097
CECONY | Commodity |  |
Regulatory Assets [Line Items] |  |
Regulatory assets, recovery period | 4 years |
RECO |  |
Regulatory Assets [Line Items] |  |
Return on regulatory assets | $ 24 | 21
Net unbilled revenue deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory liabilities | $ 278 | $ 204

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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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -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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