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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, 2020 | Mar. 31, 2019
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ 2 | $ (1)
Total deferred gains/(losses) | (155) | (47)
Net deferred gains/(losses) | (153) | (48)
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | (90) | (1)
Gas purchased for resale |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | (2) | (3)
Non-utility revenue |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 5 | 9
Other interest expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | (86) | (9)
Other operations and maintenance expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | (7) | 2
Deferred Derivative Gains, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (1) | 5
Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 3 | (6)
Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (14) | (3)
Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (96) | (18)
Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (45) | (26)
CECONY |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 2 | (2)
Total deferred gains/(losses) | (140) | (40)
Net deferred gains/(losses) | (138) | (42)
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | (7) | 2
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 interest expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | 0 |
CECONY | Other operations and maintenance expense |  |
Pre-tax gains/(losses) recognized in income |  |
Total pre-tax gains/(losses) recognized in income | (7) | 2
CECONY | Deferred Derivative Gains, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (1) | 3
CECONY | Deferred Derivative Gains, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | 3 | (5)
CECONY | Deferred Derivative Losses, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (12) | 0
CECONY | Recoverable Energy Costs, Current |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | (86) | (14)
CECONY | Deferred Derivative Losses, Noncurrent |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |
Total deferred gains/(losses) | $ (42) | $ (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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