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Summary of Significant Accounting Policies and Other Matters - Other Deferred Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items] |  |
Prepayments | $ 24 | $ 16
Other deferred charges and noncurrent assets | 105 | 81
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 15 | 12
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | 37 | 22
CECONY |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Prepayments | 23 | 15
Other deferred charges and noncurrent assets | 103 | 78
Depreciation expense, other deferred charges and noncurrent assets and prepayments | 14 | 11
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments | $ 33 | $ 19

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