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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | $ 366 | $ 43 | $ 549 | $ 38
Total deferred gains/(losses) | (48) | (47) | (21) | (224)
Net deferred gains/(losses) | 318 | (4) | 528 | (186)
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | (9) | 5 | 32 | (87)
Gas purchased for resale |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 2 | 0 | 4 | (3)
Non-utility revenue |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | (23) | (2) | (22) | 3
Other operations and maintenance expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 1 | 0 | 5 | (5)
Other interest expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 11 | 7 | 45 | (82)
Deferred Derivative Gains, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 296 | 26 | 443 | 23
Deferred Derivative Gains, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 70 | 17 | 106 | 15
Deferred Derivative Losses, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (4) | (9) | 25 | 12
Recoverable Energy Costs, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 17 | (23) | (30) | (163)
Deferred Derivative Losses, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (61) | (15) | (16) | (73)
CECONY | Subsidiaries |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 345 | 40 | 512 | 34
Total deferred gains/(losses) | (45) | (42) | (20) | (205)
Net deferred gains/(losses) | 300 | (2) | 492 | (171)
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 1 | 0 | 5 | (5)
CECONY | Gas purchased for resale | Subsidiaries |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0 | 0 | 0
CECONY | Non-utility revenue | Subsidiaries |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0 | 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 | 5 | (5)
CECONY | Other interest expense | Subsidiaries |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0 | 0 | 0
CECONY | Deferred Derivative Gains, Current | Subsidiaries |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 279 | 24 | 415 | 20
CECONY | Deferred Derivative Gains, Noncurrent | Subsidiaries |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 66 | 16 | 97 | 14
CECONY | Deferred Derivative Losses, Current | Subsidiaries |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (3) | (11) | 22 | 9
CECONY | Recoverable Energy Costs, Current | Subsidiaries |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 13 | (19) | (29) | (144)
CECONY | Deferred Derivative Losses, Noncurrent | Subsidiaries |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | $ (55) | $ (12) | $ (13) | $ (70)

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