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Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | $ (183) | $ (27)
Gross Amounts Offset | 17 | (1)
Net Amounts of Assets/ (Liabilities) | (166) | (28)
Margin deposits | 9 | 7
CECONY |  |
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (124) | (7)
Gross Amounts Offset | 17 | 1
Net Amounts of Assets/ (Liabilities) | (107) | (6)
Margin deposits | 8 | 6
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount | 919 | 499
Fair Value of Derivative Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (140) | (61)
Gross Amounts Offset | 17 | 11
Net Amounts of Assets/ (Liabilities) | (123) | (50)
Fair Value of Derivative Liabilities, Current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (7) |
Fair Value of Derivative Liabilities, Current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (100) | (31)
Gross Amounts Offset | 19 | 6
Net Amounts of Assets/ (Liabilities) | (81) | (25)
Fair Value of Derivative Liabilities, Non-current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (122) | (25)
Gross Amounts Offset | 16 | 9
Net Amounts of Assets/ (Liabilities) | (106) | (16)
Fair Value of Derivative Liabilities, Non-current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (34) | (6)
Fair Value of Derivative Liabilities, Non-current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (80) | (12)
Gross Amounts Offset | 16 | 6
Net Amounts of Assets/ (Liabilities) | (64) | (6)
Fair Value of Derivative Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (262) | (86)
Gross Amounts Offset | 33 | 20
Net Amounts of Assets/ (Liabilities) | (229) | (66)
Fair Value of Derivative Liabilities | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (180) | (43)
Gross Amounts Offset | 35 | 12
Net Amounts of Assets/ (Liabilities) | (145) | (31)
Fair Value of Derivative Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 60 | 43
Gross Amounts Offset | (3) | (14)
Net Amounts of Assets/ (Liabilities) | 57 | 29
Fair Value of Derivative Assets, Current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 39 | 25
Gross Amounts Offset | (6) | (6)
Net Amounts of Assets/ (Liabilities) | 33 | 19
Fair Value of Derivative Assets, Non-current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 19 | 16
Gross Amounts Offset | (13) | (7)
Net Amounts of Assets/ (Liabilities) | 6 | 9
Fair Value of Derivative Assets, Non-current | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 1 | 2
Fair Value of Derivative Assets, Non-current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 17 | 11
Gross Amounts Offset | (12) | (5)
Net Amounts of Assets/ (Liabilities) | 5 | 6
Fair Value of Derivative Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 79 | 59
Gross Amounts Offset | (16) | (21)
Net Amounts of Assets/ (Liabilities) | 63 | 38
Fair Value of Derivative Assets | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 56 | 36
Gross Amounts Offset | (18) | (11)
Net Amounts of Assets/ (Liabilities) | $ 38 | $ 25

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