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Revenue Recognition - Additional information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Late fee and other fees not collected |  | $ 12 | $ 18 | $ 49 | $ 38
CECONY | Subsidiaries |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Late fee and other fees not collected |  | $ 11 | $ 17 | $ 46 | $ 36
O&R | COVID-19 | Subsidiaries |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Late payment charges and fees | $ 52 |  |  |  |
Late payment charges and fees, surcharge recovery period |  |  |  | 12 months |

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- Definition Late Fee Income and Other Fees Not Collected + References No definition available. + Details
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- Definition Revenue From Contract With Customer, Late Payment Charges And Fees, Surcharge Recovery Period + References No definition available. + Details
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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. + References No definition available. + Details
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- Details
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- Details
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- Details
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