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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 1,766 | $ 1,883
Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,643 | 1,753
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 24 | 128
Unrecognized pension and other postretirement costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 10 | 110
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 913 | 928
Environmental remediation costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 833 | 850
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 408 | 375
Revenue taxes | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 392 | 359
COVID-19 Deferral for Uncollectible Accounts Receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 236 | 236
COVID-19 Deferral for Uncollectible Accounts Receivable | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 232 | 231
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 91 | 141
Deferred derivative losses - short term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 88 | 134
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 32 | 51
Deferred derivative losses - long term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 27 | 45
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 62 | 24
Other | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 61 | $ 24

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