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Summary of Significant Accounting Policies and Other Matters - Plant and Depreciation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Accumulated amortization | $ 297 | $ 228 |
Annual aggregate depreciation allowance | 1,802 |  |
Prepayments | 16 | 12 |
Other deferred charges and noncurrent assets | 81 | 54 |
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 12 | 7 |
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | 22 | 10 |
Software Licenses |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Gross asset | 79 | 86 |
Estimated aggregate annual amortization expense | 7 |  |
Accumulated amortization | $ 24 | $ 17 |
Non-Utility Plant | Maximum | Land And Conduit |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives (years) | 10 years |  |
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 |  |
CECONY |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
AFUDC rates (percent) | 4.50% | 5.20% | 5.10%
Average depreciation rates (percent) | 3.50% | 3.50% | 3.20%
Annual aggregate depreciation allowance | $ 1,710 |  |
Prepayments | 15 | $ 11 |
Other deferred charges and noncurrent assets | 78 | 51 |
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 11 | 6 |
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | 19 | 8 |
CECONY | Software Licenses |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Gross asset | 74 | 81 |
Estimated aggregate annual amortization expense | 7 |  |
Accumulated amortization | $ 24 | $ 17 |
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) | 85 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) | 4.80% | 5.30% | 5.30%
Average depreciation rates (percent) | 3.10% | 3.20% | 3.00%
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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