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Summary of Significant Accounting Policies and Other Matters - Plant and Depreciation Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Annual aggregate depreciation allowance | $ 2,030 |  |
Software Licenses |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Gross asset | 65 | $ 72 |
Estimated aggregate annual amortization expense | 7 |  |
Accumulated amortization | $ 38 | $ 31 |
Non-Utility Plant | Maximum | Wind Power Generating Assets |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 30 years |  |
Non-Utility Plant | Maximum | Solar Powered Generating Assets |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 35 years |  |
Non-Utility Plant | Maximum | Land And Conduit |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 10 years |  |
CECONY |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
AFUDC rates (percent) | 5.90% | 5.20% | 4.50%
Average depreciation rates (percent) | 3.60% | 3.50% | 3.50%
Annual aggregate depreciation allowance | $ 1,925 |  |
CECONY | Software Licenses |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Gross asset | 62 | $ 69 |
Estimated aggregate annual amortization expense | 7 |  |
Accumulated amortization | $ 36 | $ 31 |
CECONY | Electric | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 5 years |  |
CECONY | Electric | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 80 years |  |
CECONY | Gas | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 5 years |  |
CECONY | Gas | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 90 years |  |
CECONY | Steam | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 5 years |  |
CECONY | Steam | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 80 years |  |
CECONY | General Plant | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 5 years |  |
CECONY | General Plant | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 55 years |  |
O&R |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
AFUDC rates (percent) | 6.20% | 5.00% | 4.80%
Average depreciation rates (percent) | 3.10% | 3.00% | 3.10%
O&R | Electric | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 5 years |  |
O&R | Electric | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 75 years |  |
O&R | General Plant | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 5 years |  |
O&R | General Plant | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 50 years |  |

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