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Income Tax - Additional Information (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 01, 2023 | Mar. 31, 2023 | Mar. 31, 2022
Income Taxes Disclosure [Line Items] |  |  |
Income tax expense (benefit) |  | $ 243,000,000 | $ 153,000,000
Gain on sale of the Clean Energy Businesses |  | $ 855,000,000 | $ 0
Gain on sale of subsidiary | $ 855,000,000 |  |
Gain on sale of subsidiary, after tax | 791,000,000 |  |
State income tax, net of federal income tax benefit |  | 5.00% | 5.00%
Estimated liability for uncertain tax positions |  | $ 26,000,000 |
Research and development credits |  | 3,000,000 |
Effective income tax rate reconciliation, uncertainty of taxes |  | 23,000,000 |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate |  | 26,000,000 |
Penalties recognized for uncertain tax positions |  | 0 | $ 0
State and Local Jurisdiction | New York State Division of Taxation and Finance |  |  |
Income Taxes Disclosure [Line Items] |  |  |
Expected minimum loss |  | $ 5,000,000 |
State income tax, net of federal income tax benefit |  | 7.25% |
State and Local Jurisdiction | Metropolitan Transportation Authority Subcharge |  |  |
Income Taxes Disclosure [Line Items] |  |  |
State income tax, net of federal income tax benefit |  | 9.425% |
Subsidiaries |  |  |
Income Taxes Disclosure [Line Items] |  |  |
Income tax expense (benefit) |  | $ 154,000,000 | 117,000,000
CECONY | Subsidiaries |  |  |
Income Taxes Disclosure [Line Items] |  |  |
Income tax expense (benefit) |  | $ 154,000,000 | $ 117,000,000
State income tax, net of federal income tax benefit |  | 5.00% | 5.00%
Estimated liability for uncertain tax positions |  | $ 9,000,000 |
Effective income tax rate reconciliation, uncertainty of taxes |  | 6,000,000 |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate |  | 9,000,000 |
Clean Energy Businesses |  |  |
Income Taxes Disclosure [Line Items] |  |  |
Gain on sale of the Clean Energy Businesses | $ 202,000,000 |  |
Deferred tax benefit, valuation allowance |  | 10,000,000 |
Deferred tax assets, tax credits |  | 107,000,000 |
Deferred state taxes benefit |  | $ 44,000,000 |

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- Definition Amount of deferred state and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, deferred regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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