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Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | $ 670 | $ 550
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (447) | (229)
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | (297) | (183)
Gross Amounts Offset | (1) | 17
Net Amounts of Assets/ (Liabilities) | (298) | (166)
Margin deposits |  | 9
Margin deposit liabilities | (2) |
Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 0 | 1
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (122) | (41)
CECONY |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 552 | 498
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | (162) | (124)
Gross Amounts Offset | (1) | 17
Net Amounts of Assets/ (Liabilities) | (163) | (107)
Margin deposits |  | 8
Margin deposit liabilities | (2) |
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount | 878 | 919
Fair Value of Derivative Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (160) | (140)
Gross Amounts Offset | 13 | 17
Net Amounts of Assets/ (Liabilities) | (147) | (123)
Fair Value of Derivative Liabilities, Current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (24) | (7)
Fair Value of Derivative Liabilities, Current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (113) | (100)
Gross Amounts Offset | 29 | 19
Net Amounts of Assets/ (Liabilities) | (84) | (81)
Fair Value of Derivative Liabilities, Noncurrent |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (258) | (122)
Gross Amounts Offset | (40) | 16
Net Amounts of Assets/ (Liabilities) | (298) | (106)
Fair Value of Derivative Liabilities, Noncurrent | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (98) | (34)
Fair Value of Derivative Liabilities, Noncurrent | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (147) | (80)
Gross Amounts Offset | 13 | 16
Net Amounts of Assets/ (Liabilities) | (134) | (64)
Fair Value of Derivative Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (418) | (262)
Gross Amounts Offset | (27) | 33
Net Amounts of Assets/ (Liabilities) | (445) | (229)
Fair Value of Derivative Liabilities | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (260) | (180)
Gross Amounts Offset | 42 | 35
Net Amounts of Assets/ (Liabilities) | (218) | (145)
Fair Value of Derivative Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 88 | 60
Gross Amounts Offset | (16) | (3)
Net Amounts of Assets/ (Liabilities) | 72 | 57
Fair Value of Derivative Assets, Current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 70 | 39
Gross Amounts Offset | (30) | (6)
Net Amounts of Assets/ (Liabilities) | 40 | 33
Fair Value of Derivative Assets, Noncurrent |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 33 | 19
Gross Amounts Offset | 42 | (13)
Net Amounts of Assets/ (Liabilities) | 75 | 6
Fair Value of Derivative Assets, Noncurrent | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) |  | 1
Fair Value of Derivative Assets, Noncurrent | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 28 | 17
Gross Amounts Offset | (13) | (12)
Net Amounts of Assets/ (Liabilities) | 15 | 5
Fair Value of Derivative Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 121 | 79
Gross Amounts Offset | 26 | (16)
Net Amounts of Assets/ (Liabilities) | 147 | 63
Fair Value of Derivative Assets | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 98 | 56
Gross Amounts Offset | (43) | (18)
Net Amounts of Assets/ (Liabilities) | $ 55 | $ 38

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