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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, 2021 | Mar. 31, 2020
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 16 | $ 2
Total deferred gains/(losses) | 27 | (155)
Net deferred gains/(losses) | 43 | (153)
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 65 | (90)
Gas purchased for resale |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 1 | (2)
Non-utility revenue |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 3 | 5
Other operations and maintenance expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 2 | (7)
Other interest expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 59 | (86)
Deferred Derivative Gains, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 19 | (1)
Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (3) | 3
Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 4 | (14)
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 0 | (96)
Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 23 | (45)
CECONY |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 14 | 2
Total deferred gains/(losses) | 25 | (140)
Net deferred gains/(losses) | 39 | (138)
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 2 | (7)
CECONY | Gas purchased for resale |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0
CECONY | Non-utility revenue |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0
CECONY | Other operations and maintenance expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 2 | (7)
CECONY | Other interest expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) 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) | 17 | (1)
CECONY | Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (3) | 3
CECONY | Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 3 | (12)
CECONY | Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 2 | (86)
CECONY | Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 20 | $ (42)

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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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