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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 2,311 | $ 2,347
Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 2,176 | 2,209
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,098 | 1,105
Environmental remediation costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,015 | 1,022
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 509 | 490
Revenue taxes | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 488 | 470
COVID-19 deferral for uncollectible accounts receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 324 | 291
COVID-19 deferral for uncollectible accounts receivable | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 318 | 288
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 202 | 269
Deferred derivative losses - short term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 191 | 253
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 133 | 163
Deferred derivative losses - long term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 121 | 148
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 4 | 0
Unrecognized pension and other postretirement costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 3 | 0
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 41 | 29
Other | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 40 | $ 28

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