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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, 2023 | Mar. 31, 2022
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (275) | $ 384
Total deferred gains/(losses) | (440) | 87
Net deferred gains/(losses) | (715) | 471
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 26 | 56
Gas purchased for resale |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 4 | 5
Other operations and maintenance expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 3
Other interest expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 5 | 65
Non-utility |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 17 | (17)
Deferred Derivative Gains, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (149) | 339
Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (126) | 45
Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (16) | (36)
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (291) | 157
Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (133) | (34)
CECONY | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (248) | 353
Total deferred gains/(losses) | (416) | 77
Net deferred gains/(losses) | (664) | 430
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 3
CECONY | Gas purchased for resale | 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 | 3
CECONY | Other interest expense | Subsidiaries |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0
CECONY | Non-utility | 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) | (137) | 312
CECONY | Deferred Derivative Gains, Noncurrent | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (111) | 41
CECONY | Deferred Derivative Losses, Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (12) | (32)
CECONY | Recoverable Energy Costs, Current | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (274) | 143
CECONY | Deferred Derivative Losses, Noncurrent | Subsidiaries |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (130) | $ (34)

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