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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, 2020 | Dec. 31, 2019
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (26) | $ 1
Total deferred gains/(losses) | (301) | (300)
Net deferred gains/(losses) | (327) | (299)
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | (63) | (12)
Gas purchased for resale |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | (2) | (2)
Non-utility revenue |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 7 | 25
Other operations and maintenance expense |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | (3) | 1
Other interest expense |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | (65) | (36)
Deferred Derivative Gains,Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (26) | 4
Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 0 | (3)
Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (63) | (91)
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (201) | (142)
Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (37) | (67)
CECONY |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (27) | 4
Total deferred gains/(losses) | (277) | (272)
Net deferred gains/(losses) | (304) | (268)
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | (3) | 1
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 | (3) | 1
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) | (27) | 5
CECONY | Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 0 | (1)
CECONY | Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (64) | (83)
CECONY | Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (177) | (124)
CECONY | Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (36) | $ (65)

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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=121590274&loc=SL5618551-113959 + Details
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