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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 2,108 | $ 1,975
Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,987 | 1,858
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 125 | 78
Unrecognized pension and other postretirement costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 125 | 78
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 983 | 987
Environmental remediation costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 899 | 903
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 494 | 414
Revenue taxes | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 474 | 397
COVID-19 Deferral for Uncollectible Accounts Receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 207 | 253
COVID-19 Deferral for Uncollectible Accounts Receivable | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 205 | 249
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 137 | 184
Deferred derivative losses - short term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 133 | 178
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 99 | 31
Deferred derivative losses - long term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 89 | 26
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 63 | 28
Other | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 62 | $ 27

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