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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 2,452 | $ 2,402
Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 2,299 | 2,240
Environmental investigation and remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,022 | 1,037
Environmental investigation and remediation costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 935 | 942
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 612 | 567
Revenue taxes | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 586 | 543
UB deferral for uncollectible accounts receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 541 | 551
UB deferral for uncollectible accounts receivable | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 536 | 541
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 116 | 102
Deferred derivative losses - short term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 108 | 92
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 64 | 106
Deferred derivative losses - long term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 57 | 94
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 21 | 0
Unrecognized pension and other postretirement costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 13 | 0
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 76 | 39
Other | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 64 | $ 28

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