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Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | $ (15) | $ (38) | $ 5 | $ (75)
Total deferred gains (losses) | 19 | (138) | 69 | (156)
Net deferred gains (losses) | $ 4 | $ (176) | 74 | (231)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs | Operating costs |  |
Pre-tax gains (losses) recognized in income |  |  |  |
Total pre-tax gains (losses) recognized in income | $ 0 | $ (1) |  |
Regulatory Liabilities, Current |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (5) | (31) | (3) | (45)
Regulatory Liabilities, Noncurrent |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (10) | (7) | 8 | (30)
Regulatory Assets Current |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (9) | (18) | (14) | 104
Recoverable Energy Costs, Current |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (13) | (81) | 41 | (269)
Regulatory Assets Non Current |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | 41 | (39) | 42 | 9
CECONY | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (16) | (32) | 2 | (72)
Total deferred gains (losses) | 12 | (124) | 58 | (136)
Net deferred gains (losses) | (4) | (156) | 60 | (208)
Pre-tax gains (losses) recognized in income |  |  |  |
Total pre-tax gains (losses) recognized in income | 0 | (1) |  |
CECONY | Regulatory Liabilities, Current | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (5) | (27) | (4) | (42)
CECONY | Regulatory Liabilities, Noncurrent | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (11) | (5) | 6 | (30)
CECONY | Regulatory Assets Current | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (11) | (15) | (16) | 102
CECONY | Recoverable Energy Costs, Current | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (13) | (75) | 38 | (247)
CECONY | Regulatory Assets Non Current | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | $ 36 | $ (34) | $ 36 | $ 9

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