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Summary of Significant Accounting Policies and Other Matters - Other Deferred Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Prepayments | $ 57 | $ 50 |
Other deferred charges and noncurrent assets | 254 | 179 |
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 33 | 21 | $ 15
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | 91 | 58 |
CECONY |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Prepayments | 54 | 49 |
Other deferred charges and noncurrent assets | 243 | 178 |
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 32 | 20 | $ 14
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | $ 85 | $ 53 |

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