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Derivative Instruments and Hedging Activities - Realized and Unrealized Gains or Losses on Commodity Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (332) | $ 251
Total deferred or recognized gains/(losses) | (780) | 384
Net deferred gains/(losses) | (1,112) | 635
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 26 | $ 168
Gas purchased for resale |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs | Operating costs
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 4 | $ 5
Non-utility |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | TOTAL OPERATING REVENUES | TOTAL OPERATING REVENUES
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 17 | $ 0
Other operations and maintenance expense |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs | Operating costs
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 0 | $ 4
Other interest expense (b) |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other interest expense (income) | Other interest expense (income)
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 5 | $ 159
Regulatory Liabilities Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (236) | 168
Regulatory Liabilities Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (96) | 83
Regulatory Assets Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred or recognized gains/(losses) | (85) | (43)
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred or recognized gains/(losses) | (563) | 408
Regulatory Assets Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred or recognized gains/(losses) | (132) | 19
CECONY |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (297) | 230
Total deferred or recognized gains/(losses) | (731) | 347
Net deferred gains/(losses) | (1,028) | 577
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 0 | $ 4
CECONY | Gas purchased for resale |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs | Operating costs
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 0 | $ 0
CECONY | Non-utility |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | TOTAL OPERATING REVENUES | TOTAL OPERATING REVENUES
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 0 | $ 0
CECONY | Other operations and maintenance expense |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs | Operating costs
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 0 | $ 4
CECONY | Other interest expense (b) |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other interest expense (income) | Other interest expense (income)
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | $ 0 | $ 0
CECONY | Regulatory Liabilities Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (216) | 155
CECONY | Regulatory Liabilities Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (81) | 75
CECONY | Regulatory Assets Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred or recognized gains/(losses) | (76) | (44)
CECONY | Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred or recognized gains/(losses) | (533) | 372
CECONY | Regulatory Assets Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred or recognized gains/(losses) | $ (122) | $ 19

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