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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, 2022 | Mar. 31, 2021
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 384 | $ 16
Total deferred gains/(losses) | 87 | 27
Net deferred gains/(losses) (a) | 471 | 43
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 56 | 65
Gas purchased for resale |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 5 | 1
Non-utility revenue |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | (17) | 3
Other operations and maintenance expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 3 | 2
Other interest expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 65 | 59
Deferred Derivative Gains, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 339 | 19
Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 45 | (3)
Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (36) | 4
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 157 | 0
Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (34) | 23
CECONY | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 353 | 14
Total deferred gains/(losses) | 77 | 25
Net deferred gains/(losses) (a) | 430 | 39
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 3 | 2
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 | 3 | 2
CECONY | Other interest expense | Subsidiaries |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 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) | 312 | 17
CECONY | Deferred Derivative Gains, Noncurrent | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 41 | (3)
CECONY | Deferred Derivative Losses, Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (32) | 3
CECONY | Recoverable Energy Costs, Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 143 | 2
CECONY | Deferred Derivative Losses, Noncurrent | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (34) | $ 20

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