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Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | $ 43 | $ 15 | $ 38 | $ (5)
Total deferred gains/(losses) | (47) | (11) | (224) | (208)
Net deferred gains/(losses) | (4) | 4 | (186) | (213)
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 5 | (21) | (87) | (42)
Gas purchased for resale |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | 1 | (3) | (2)
Non-utility revenue |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | (2) | 5 | 3 | 20
Other operations and maintenance expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | (1) | (5) | 0
Other interest expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 7 | (26) | (82) | (60)
Deferred Derivative Gains, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 26 | 15 | 23 | 3
Deferred Derivative Gains, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 17 | 0 | 15 | (8)
Deferred Derivative Losses, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (9) | 6 | 12 | (32)
Recoverable Energy Costs, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (23) | (35) | (163) | (94)
Deferred Derivative Losses, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (15) | 18 | (73) | (82)
CECONY |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 40 | 15 | 34 | (2)
Total deferred gains/(losses) | (42) | (10) | (205) | (189)
Net deferred gains/(losses) | (2) | 5 | (171) | (191)
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | (1) | (5) | 0
CECONY | Gas purchased for resale |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0 | 0 | 0
CECONY | Non-utility revenue |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0 | 0 | 0
CECONY | Other operations and maintenance expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | (1) | (5) | 0
CECONY | Other interest expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 0 | 0 | 0 | 0
CECONY | Deferred Derivative Gains, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 24 | 15 | 20 | 3
CECONY | Deferred Derivative Gains, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 16 | 0 | 14 | (5)
CECONY | Deferred Derivative Losses, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (11) | 6 | 9 | (28)
CECONY | Recoverable Energy Costs, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (19) | (32) | (144) | (82)
CECONY | Deferred Derivative Losses, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | $ (12) | $ 16 | $ (70) | $ (79)

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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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