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Current Expected Credit Losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ (78) |  | $ 19
Subsidiaries | CECONY |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic |  | $ 20 |

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- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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