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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, 2020 | Dec. 31, 2019
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Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | $ (366) | $ (183)
Gross Amounts Offset | 3 | 17
Net Amounts of Assets/ (Liabilities) | (363) | (166)
Margin deposits | 3 | 9
CECONY |  |
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (252) | (124)
Gross Amounts Offset | 0 | 17
Net Amounts of Assets/ (Liabilities) | (252) | (107)
Margin deposits | 3 | 8
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount | 863 | 919
Fair Value of Derivative Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (225) | (140)
Gross Amounts Offset | (13) | 17
Net Amounts of Assets/ (Liabilities) | (238) | (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) | (174) | (100)
Gross Amounts Offset | 11 | 19
Net Amounts of Assets/ (Liabilities) | (163) | (81)
Fair Value of Derivative Liabilities, Non-current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (207) | (122)
Gross Amounts Offset | (33) | 16
Net Amounts of Assets/ (Liabilities) | (240) | (106)
Fair Value of Derivative Liabilities, Non-current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (82) | (34)
Fair Value of Derivative Liabilities, Non-current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (114) | (80)
Gross Amounts Offset | 9 | 16
Net Amounts of Assets/ (Liabilities) | (105) | (64)
Fair Value of Derivative Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (432) | (262)
Gross Amounts Offset | (46) | 33
Net Amounts of Assets/ (Liabilities) | (478) | (229)
Fair Value of Derivative Liabilities | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (288) | (180)
Gross Amounts Offset | 20 | 35
Net Amounts of Assets/ (Liabilities) | (268) | (145)
Fair Value of Derivative Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 44 | 60
Gross Amounts Offset | 14 | (3)
Net Amounts of Assets/ (Liabilities) | 58 | 57
Fair Value of Derivative Assets, Current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 20 | 39
Gross Amounts Offset | (12) | (6)
Net Amounts of Assets/ (Liabilities) | 8 | 33
Fair Value of Derivative Assets, Non-current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 22 | 19
Gross Amounts Offset | 35 | (13)
Net Amounts of Assets/ (Liabilities) | 57 | 6
Fair Value of Derivative Assets, Non-current | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) |  | 1
Fair Value of Derivative Assets, Non-current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 16 | 17
Gross Amounts Offset | (8) | (12)
Net Amounts of Assets/ (Liabilities) | 8 | 5
Fair Value of Derivative Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 66 | 79
Gross Amounts Offset | 49 | (16)
Net Amounts of Assets/ (Liabilities) | 115 | 63
Fair Value of Derivative Assets | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 36 | 56
Gross Amounts Offset | (20) | (18)
Net Amounts of Assets/ (Liabilities) | $ 16 | $ 38

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