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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 1,872 | $ 1,883
Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 1,735 | 1,753
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 27 | 128
Unrecognized pension and other postretirement costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 8 | 110
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 916 | 928
Environmental remediation costs | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 837 | 850
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 393 | 375
Revenue taxes | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 377 | 359
COVID-19 Deferral for Uncollectible Accounts Receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 274 | 236
COVID-19 Deferral for Uncollectible Accounts Receivable | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 266 | 231
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 131 | 141
Deferred derivative losses - short term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 125 | 134
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 81 | 51
Deferred derivative losses - long term | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 73 | 45
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 50 | 24
Other | Subsidiaries | CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | $ 49 | $ 24

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