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Income Tax - Additional Information (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2023 | Oct. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Increase to net deferred income tax liabilities |  |  | $ 228 |  |  |
Effective income tax rate reconciliation, increase (decrease), percent (in percent) |  |  | (8.00%) |  |  |
Gain (loss) on disposition of stock in subsidiary | $ 865 |  |  |  |  |
Gain (loss) on disposition of stock in subsidiary, after tax | $ 767 |  |  |  |  |
Deferred tax asset, valuation allowance |  |  | $ 7 | $ 18 |  |
Increase (decrease) in income taxes payable |  |  | $ (228) |  |  |
State income tax rate (in percent) |  |  | 5.00% | 6.00% | 4.00% |
Unrecognized tax benefits |  |  | $ 11 | $ 23 | $ 17 | $ 14
Additions based on tax positions related to the current year |  |  | 8 | 3 | $ 3 |
Unrecognized tax benefits, increase (decrease) resulting from prior period tax positions |  |  | (8) |  |  |
Effective income tax rate reconciliation, uncertainty of taxes |  |  | 3 |  |  |
Unrecognized tax benefits, period increase (decrease) |  |  | (12) |  |  |
Unrecognized tax benefits, net |  |  | 10 |  |  |
Dividends and interest paid |  | $ 6 |  |  |  |
Income taxes paid |  | 4 |  |  |  |
Deposit applied to income taxes |  | $ 12 |  |  |  |
Clean Energy Businesses |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax assets |  |  | 17 |  |  |
Deferred tax asset, valuation allowance |  |  | 9 |  |  |
Deferred tax assets, operating loss carryforwards, state and local |  |  | 26 |  |  |
General Business Tax Credit |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax credit carryovers |  |  | 270 |  |  |
State | New York State |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | 43 |  |
Deferred tax asset, valuation allowance |  |  |  | 9 |  |
Expected taxable income minimum |  |  | $ 5 |  |  |
State income tax rate (in percent) |  |  | 7.25% |  |  |
State | New York City |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax assets |  |  | $ 8 |  |  |
State | Metropolitan Transportation Authority Subcharge |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
State income tax rate (in percent) |  |  | 9.425% |  |  |
CECONY |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Increase to net deferred income tax liabilities |  |  | $ 204 |  |  |
Deferred tax asset, valuation allowance |  |  | 0 | $ 0 |  |
Increase (decrease) in income taxes payable |  |  | $ (204) |  |  |
State income tax rate (in percent) |  |  | 5.00% | 5.00% | 5.00% |
Unrecognized tax benefits |  |  | $ 7 | $ 8 | $ 5 | $ 3
Additions based on tax positions related to the current year |  |  | 4 | $ 2 | $ 2 |
Uncertain tax positions, reversed |  |  | 6 |  |  |
CECONY | Subsidiaries |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Increase (decrease) in deferred tax liabilities |  |  | 10 |  |  |
Unrecognized tax benefits |  |  | 7 |  |  |
Additions based on tax positions related to the current year |  |  | 4 |  |  |
Unrecognized tax benefits, increase (decrease) resulting from prior period tax positions |  |  | $ (5) |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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