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Current Expected Credit Losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 31 | $ 0 | $ (47) | $ 19
Subsidiaries | CECONY |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 30 | $ (1) | $ (48) | $ 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 -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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