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Summary of Significant Accounting Policies and Other Matters - Other Deferred Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Prepayments | $ 50 | $ 24 |
Other deferred charges and noncurrent assets | 179 | 105 |
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 21 | 15 | $ 12
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | 58 | 37 |
CECONY |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Prepayments | 49 | 23 |
Other deferred charges and noncurrent assets | 178 | 103 |
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 20 | 14 | $ 11
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | $ 53 | $ 33 |

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