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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 2,402 | $ 2,347
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 2,240 | 2,209
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,037 | 1,105
Environmental remediation costs | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 942 | 1,022
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 567 | 490
Revenue taxes | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 543 | 470
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 106 | 163
Deferred derivative losses - long term | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 94 | 148
UB deferral for uncollectible accounts receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 551 | 291
UB deferral for uncollectible accounts receivable | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 541 | 288
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 39 | 29
Other | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 28 | 28
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 102 | 269
Deferred derivative losses - short term | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 92 | $ 253

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