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Income Tax - Summary of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of period | $ 11 | $ 23 | $ 17
Additions based on tax positions related to the current year | 4 | 8 | 3
Additions based on tax positions of prior years |  | 3 | 6
Reductions for tax positions of prior years | (6) | (11) | (1)
Settlements | 0 | (12) | (2)
Balance at end of period | 9 | 11 | 23
CECONY |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of period | 7 | 8 | 5
Additions based on tax positions related to the current year | 4 | 4 | 2
Additions based on tax positions of prior years | 0 | 1 | 1
Reductions for tax positions of prior years | (6) | (6) | 0
Settlements | 0 | 0 | 0
Balance at end of period | $ 5 | $ 7 | $ 8

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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