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Income Tax - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Taxes Disclosure [Line Items] |  |  |  |
Income Tax Expense | $ 202,000,000 | $ 133,000,000 | $ 493,000,000 | $ 307,000,000
Accrued income taxes | 66,000,000 | 66,000,000 | 66,000,000 | 66,000,000
Deferred tax assets | 73,000,000 | 73,000,000 | 73,000,000 | 73,000,000
Estimated liability for uncertain tax positions | 12,000,000 |  | 12,000,000 |
Unrecognized tax benefits, increase resulting from current period tax positions |  |  | 3,000,000 |
Unrecognized tax benefits, net | 11,000,000 |  | 11,000,000 |
Unrecognized tax benefits, interest expenses |  |  | 0 | 0
Unrecognized tax benefits penalties |  |  | 0 | 0
Subsidiaries | CECONY |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Income Tax Expense | 187,000,000 | 119,000,000 | 462,000,000 | 301,000,000
Accrued income taxes | 89,000,000 | 89,000,000 | 89,000,000 | 89,000,000
Deferred tax assets | 64,000,000 | $ 64,000,000 | 64,000,000 | $ 64,000,000
Estimated liability for uncertain tax positions | $ 8,000,000 |  | 8,000,000 |
Unrecognized tax benefits, increase resulting from current period tax positions |  |  | $ 2,000,000 |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(b)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount, before allocation of valuation allowances, of deferred tax asset attributable to deductible differences from reserves and accruals, compensation and benefit costs, and other provisions, reserves, and allowances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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