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Current Expected Credit Losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 27 | $ 1 | $ 101 | $ (46)
Subsidiaries | CECONY |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 29 | $ 3 | $ 95 | $ (45)

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