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Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | $ 1,042 | $ 832
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (210) | (236)
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | 367 | (8)
Gross Amounts Offset | (132) | (24)
Net Amounts of Assets/ (Liabilities) | 235 | (32)
Margin deposits | 1 | 1
Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 24 | 4
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (13) | (57)
CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 888 | 728
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | 310 | 25
Gross Amounts Offset | (154) | (26)
Net Amounts of Assets/ (Liabilities) | 156 | (1)
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount | 1,014 | 1,031
Total fair value of derivative assets, Noncurrent | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 24 | 4
Fair value of derivative liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (330) | (289)
Gross Amounts Offset | 196 | 137
Net Amounts of Assets/ (Liabilities) | (134) | (152)
Fair value of derivative liabilities, Current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (9) | (20)
Fair value of derivative liabilities, Current | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (215) | (131)
Gross Amounts Offset | 119 | 43
Net Amounts of Assets/ (Liabilities) | (96) | (88)
Fair value of derivative liabilities, Noncurrent |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (94) | (94)
Gross Amounts Offset | 18 | 10
Net Amounts of Assets/ (Liabilities) | (76) | (84)
Fair value of derivative liabilities, Noncurrent | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (4) | (38)
Fair value of derivative liabilities, Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (82) | (50)
Gross Amounts Offset | 19 | 10
Net Amounts of Assets/ (Liabilities) | (63) | (40)
Total fair value of derivative liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (424) | (383)
Gross Amounts Offset | 214 | 147
Net Amounts of Assets/ (Liabilities) | (210) | (236)
Total fair value of derivative liabilities | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (297) | (181)
Gross Amounts Offset | 138 | 53
Net Amounts of Assets/ (Liabilities) | (159) | (128)
Fair value of derivative assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 637 | 285
Gross Amounts Offset | (328) | (158)
Net Amounts of Assets/ (Liabilities) | 309 | 127
Fair value of derivative assets, Current | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 497 | 135
Gross Amounts Offset | (270) | (64)
Net Amounts of Assets/ (Liabilities) | 227 | 71
Total fair value of derivative assets, Noncurrent |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 154 | 90
Gross Amounts Offset | (18) | (13)
Net Amounts of Assets/ (Liabilities) | 136 | 77
Total fair value of derivative assets, Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 110 | 71
Gross Amounts Offset | (22) | (15)
Net Amounts of Assets/ (Liabilities) | 88 | 56
Total fair value of derivative assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 791 | 375
Gross Amounts Offset | (346) | (171)
Net Amounts of Assets/ (Liabilities) | 445 | 204
Total fair value of derivative assets | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 607 | 206
Gross Amounts Offset | (292) | (79)
Net Amounts of Assets/ (Liabilities) | $ 315 | $ 127

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