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Current Expected Credit Losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 34 | $ (78)
Subsidiaries | CECONY |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 30 | $ (78)

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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