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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, 2021 | Dec. 31, 2020
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 191 | $ (26)
Total deferred gains/(losses) | 122 | (301)
Net deferred gains/(losses) | 313 | (327)
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 78 | (63)
Gas purchased for resale |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 18 | (2)
Non-utility revenue |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 3 | 7
Other operations and maintenance expense |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 5 | (3)
Other interest expense |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 52 | (65)
Deferred Derivative Gains,Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 134 | (26)
Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 57 | 0
Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 49 | (63)
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 3 | (201)
Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 70 | (37)
CECONY |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 175 | (27)
Total deferred gains/(losses) | 109 | (277)
Net deferred gains/(losses) | 284 | (304)
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 5 | (3)
CECONY | Gas purchased for resale |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 0 | 0
CECONY | Non-utility revenue |  |
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 gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 5 | (3)
CECONY | Other interest expense |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 0 | 0
CECONY | Deferred Derivative Gains,Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 124 | (27)
CECONY | Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 51 | 0
CECONY | Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 43 | (64)
CECONY | Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 0 | (177)
CECONY | Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 66 | $ (36)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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