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Current Expected Credit Losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ (5) | $ 27 | $ (10) | $ 101
Subsidiaries | CECONY |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic |  | $ 29 | $ (5) | $ 95

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