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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | $ 15 | $ 6 | $ (5) | $ (6)
Total deferred gains/(losses) | (11) | 36 | (208) | 31
Net deferred gains/(losses) | 4 | 42 | (213) | 25
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | (21) | (7) | (42) | (8)
Gas purchased for resale |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 1 | 0 | (2) | (1)
Non-utility revenue |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | 5 | (7) | 20 | (7)
Other interest expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | (26) | 0 | (60) | 0
Other operations and maintenance expense |  |  |  |
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | (1) | 0 |  |
Deferred Derivative Gains, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 15 | 6 | 3 | (11)
Deferred Derivative Gains, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 0 | 0 | (8) | 5
Deferred Derivative Losses, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 6 | 25 | (32) | 21
Recoverable Energy Costs, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (35) | (4) | (94) | (13)
Deferred Derivative Losses, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 18 | 15 | (82) | 23
CECONY |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 15 | 8 | (2) | (6)
Total deferred gains/(losses) | (10) | 33 | (189) | 30
Net deferred gains/(losses) | 5 | 41 | (191) | 24
Pre-tax gains/(losses) recognized in income |  |  |  |
Total pre-tax gains/(losses) recognized in income | (1) | 0 | 0 | 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 interest expense |  |  |  |
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 | (1) |  |  |
CECONY | Deferred Derivative Gains, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 15 | 6 | 3 | (10)
CECONY | Deferred Derivative Gains, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 0 | 2 | (5) | 4
CECONY | Deferred Derivative Losses, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | 6 | 25 | (28) | 23
CECONY | Recoverable Energy Costs, Current |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | (32) | (6) | (82) | (14)
CECONY | Deferred Derivative Losses, Noncurrent |  |  |  |
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: |  |  |  |
Total deferred gains/(losses) | $ 16 | $ 14 | $ (79) | $ 21

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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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