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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 2,347 | $ 1,975
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 2,209 | 1,858
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 0 | 78
Unrecognized pension and other postretirement costs | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 0 | 78
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,105 | 987
Environmental remediation costs | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,022 | 903
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 490 | 414
Revenue taxes | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 470 | 397
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 163 | 31
Deferred derivative losses - long term | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 148 | 26
COVID-19 deferral for uncollectible accounts receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 291 | 253
COVID-19 deferral for uncollectible accounts receivable | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 288 | 249
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 29 | 28
Other | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 28 | 27
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 269 | 184
Deferred derivative losses - short term | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 253 | $ 178

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