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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | $ (38) | $ (22) | $ (75) | $ (349)
Total deferred gains (losses) | (138) | (110) | (156) | (495)
Net deferred gains (losses) | $ (176) | $ (132) | $ (231) | $ (844)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs | Operating costs | Operating costs | Operating costs
Pre-tax gains (losses) recognized in income |  |  |  |
Total pre-tax gains (losses) recognized in income | $ (1) | $ 1 | $ 0 | $ 27
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 |  |  | 0 | 1
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) | (31) | (11) | (45) | (221)
Regulatory Liabilities, Noncurrent |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (7) | (11) | (30) | (128)
Regulatory Assets Current |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (18) | 22 | 104 | 47
Recoverable Energy Costs, Current |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (81) | (98) | (269) | (474)
Regulatory Assets Non Current |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (39) | (34) | 9 | (68)
CECONY | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (32) | (18) | (72) | (316)
Total deferred gains (losses) | (124) | (103) | (136) | (467)
Net deferred gains (losses) | (156) | (121) | (208) | (783)
Pre-tax gains (losses) recognized in income |  |  |  |
Total pre-tax gains (losses) recognized in income | (1) | 1 | 0 | 1
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 |  |  | 0 | 1
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) | (27) | (9) | (42) | (203)
CECONY | Regulatory Liabilities, Noncurrent | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (5) | (9) | (30) | (113)
CECONY | Regulatory Assets Current | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (15) | 20 | 102 | 45
CECONY | Recoverable Energy Costs, Current | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | (75) | (94) | (247) | (449)
CECONY | Regulatory Assets Non Current | Subsidiaries |  |  |  |
Pre-tax gains (losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains (losses) | $ (34) | $ (29) | $ 9 | $ (63)

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