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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, 2021 | Dec. 31, 2020
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Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | $ (8) | $ (366)
Gross Amounts Offset | (24) | 3
Net Amounts of Assets/ (Liabilities) | (32) | (363)
Margin deposits | 1 | 3
CECONY |  |
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 25 | (252)
Gross Amounts Offset | (26) | 0
Net Amounts of Assets/ (Liabilities) | (1) | (252)
Margin deposits |  | 3
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount | 1,031 | 863
Fair Value of Derivative Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (289) | (225)
Gross Amounts Offset | 137 | (13)
Net Amounts of Assets/ (Liabilities) | (152) | (238)
Fair Value of Derivative Liabilities, Current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (20) | (24)
Fair Value of Derivative Liabilities, Current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (131) | (174)
Gross Amounts Offset | 43 | 11
Net Amounts of Assets/ (Liabilities) | (88) | (163)
Fair Value of Derivative Liabilities, Non-current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (94) | (207)
Gross Amounts Offset | 10 | (33)
Net Amounts of Assets/ (Liabilities) | (84) | (240)
Fair Value of Derivative Liabilities, Non-current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (38) | (82)
Fair Value of Derivative Liabilities, Non-current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (50) | (114)
Gross Amounts Offset | 10 | 9
Net Amounts of Assets/ (Liabilities) | (40) | (105)
Fair Value of Derivative Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (383) | (432)
Gross Amounts Offset | 147 | (46)
Net Amounts of Assets/ (Liabilities) | (236) | (478)
Fair Value of Derivative Liabilities | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (181) | (288)
Gross Amounts Offset | 53 | 20
Net Amounts of Assets/ (Liabilities) | (128) | (268)
Fair Value of Derivative Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 285 | 44
Gross Amounts Offset | (158) | 14
Net Amounts of Assets/ (Liabilities) | 127 | 58
Fair Value of Derivative Assets, Current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 135 | 20
Gross Amounts Offset | (64) | (12)
Net Amounts of Assets/ (Liabilities) | 71 | 8
Fair Value of Derivative Assets, Non-current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 90 | 22
Gross Amounts Offset | (13) | 35
Net Amounts of Assets/ (Liabilities) | 77 | 57
Fair Value of Derivative Assets, Non-current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 71 | 16
Gross Amounts Offset | (15) | (8)
Net Amounts of Assets/ (Liabilities) | 56 | 8
Fair Value of Derivative Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 375 | 66
Gross Amounts Offset | (171) | 49
Net Amounts of Assets/ (Liabilities) | 204 | 115
Fair Value of Derivative Assets | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Derivative asset, noncurrent | 4 |
Fair Value of Derivative Assets | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 206 | 36
Gross Amounts Offset | (79) | (20)
Net Amounts of Assets/ (Liabilities) | $ 127 | $ 16

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