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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, 2019 | Dec. 31, 2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 1 | $ 3
Total deferred gains/(losses) | (300) | 5
Net deferred gains/(losses) | (299) | 8
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | (12) | (4)
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 | 25 | 4
Other operations and maintenance expense |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 1 | (2)
Other interest expense |  |
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | (36) | (4)
Deferred Derivative Gains,Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 4 | (1)
Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (3) | 4
Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (91) | 4
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (142) | (26)
Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (67) | 27
CECONY |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 4 | 4
Total deferred gains/(losses) | (272) | 8
Net deferred gains/(losses) | (268) | 12
Pre-tax gain/(loss) recognized in income |  |
Total pre-tax gain/(loss) recognized in income | 1 | (2)
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 | 1 | (2)
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) | 5 | 1
CECONY | Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (1) | 3
CECONY | Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (83) | 8
CECONY | Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (124) | (26)
CECONY | Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (65) | $ 26

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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=109980867&loc=SL5618551-113959 + Details
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