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Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 41 | $ (275)
Total deferred gains/(losses) | (17) | (440)
Net deferred gains/(losses) | 24 | (715)
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 1 | 26
Gas purchased for resale |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 4
Non-utility revenue |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 17
Other operations and maintenance expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 1 | 0
Other interest expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 5
Regulatory Liabilities, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 43 | (149)
Regulatory Liabilities, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (2) | (126)
Regulatory Assets Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 67 | (16)
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (114) | (291)
Regulatory Assets Non Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 30 | (133)
CECONY | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 38 | (248)
Total deferred gains/(losses) | (15) | (416)
Net deferred gains/(losses) | 23 | (664)
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 1 | 0
CECONY | Gas purchased for resale | Subsidiaries |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0
CECONY | Non-utility revenue | Subsidiaries |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0
CECONY | Other operations and maintenance expense | Subsidiaries |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 1 | 0
CECONY | Other interest expense | Subsidiaries |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0
CECONY | Regulatory Liabilities, Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 40 | (137)
CECONY | Regulatory Liabilities, Noncurrent | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (2) | (111)
CECONY | Regulatory Assets Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 63 | (12)
CECONY | Recoverable Energy Costs, Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (104) | (274)
CECONY | Regulatory Assets Non Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 26 | $ (130)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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