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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 1,975 | $ 1,883
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,858 | 1,753
Unrecognized pension and other postretirement costs (a) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 78 | 128
Unrecognized pension and other postretirement costs (a) | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 78 | 110
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 987 | 928
Environmental remediation costs | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 903 | 850
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 414 | 375
Revenue taxes | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 397 | 359
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 31 | 51
Deferred derivative losses - long term | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 26 | 45
COVID-19 deferral for uncollectible accounts receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 253 | 236
COVID-19 deferral for uncollectible accounts receivable | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 249 | 231
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 28 | 24
Other | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 27 | 24
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 184 | 141
Deferred derivative losses | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 178 | $ 134

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