Current Expected Credit Losses - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ (10) | $ (1) | $ (49) | $ (5) |
| Threshold period past due, trade accounts receivable, writeoff | 90 days | |||
| Subsidiaries | CECONY | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Increase (decrease) in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ (10) | $ 0 | $ (50) | $ 0 |