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Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | $ 1,017 | $ 675
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (329) | (478)
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | 181 | (366)
Gross Amounts Offset | (108) | 3
Net Amounts of Assets/ (Liabilities) | 73 | (363)
Margin deposits |  | 3
Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 5 | 0
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (65) | (106)
CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 898 | 550
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | 238 | (252)
Gross Amounts Offset | (139) | 0
Net Amounts of Assets/ (Liabilities) | 99 | (252)
Margin deposits |  | 3
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount | 1,046 | 863
Fair value of derivative liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (428) | (225)
Gross Amounts Offset | 265 | (13)
Net Amounts of Assets/ (Liabilities) | (163) | (238)
Fair value of derivative liabilities, Current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (26) | (24)
Fair value of derivative liabilities, Current | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (158) | (174)
Gross Amounts Offset | 44 | 11
Net Amounts of Assets/ (Liabilities) | (114) | (163)
Fair value of derivative liabilities, Noncurrent |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (183) | (207)
Gross Amounts Offset | 17 | (33)
Net Amounts of Assets/ (Liabilities) | (166) | (240)
Fair value of derivative liabilities, Noncurrent | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (39) | (82)
Fair value of derivative liabilities, Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (125) | (114)
Gross Amounts Offset | 28 | 9
Net Amounts of Assets/ (Liabilities) | (97) | (105)
Total fair value of derivative liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (611) | (432)
Gross Amounts Offset | 282 | (46)
Net Amounts of Assets/ (Liabilities) | (329) | (478)
Total fair value of derivative liabilities | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (283) | (288)
Gross Amounts Offset | 72 | 20
Net Amounts of Assets/ (Liabilities) | (211) | (268)
Total fair value of derivative assets, Noncurrent | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 5 |
Fair value of derivative assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 652 | 44
Gross Amounts Offset | (375) | 14
Net Amounts of Assets/ (Liabilities) | 277 | 58
Fair value of derivative assets, Current | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 407 | 20
Gross Amounts Offset | (183) | (12)
Net Amounts of Assets/ (Liabilities) | 224 | 8
Total fair value of derivative assets, Noncurrent |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 140 | 22
Gross Amounts Offset | (15) | 35
Net Amounts of Assets/ (Liabilities) | 125 | 57
Total fair value of derivative assets, Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 114 | 16
Gross Amounts Offset | (28) | (8)
Net Amounts of Assets/ (Liabilities) | 86 | 8
Total fair value of derivative assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 792 | 66
Gross Amounts Offset | (390) | 49
Net Amounts of Assets/ (Liabilities) | 402 | 115
Total fair value of derivative assets | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 521 | 36
Gross Amounts Offset | (211) | (20)
Net Amounts of Assets/ (Liabilities) | $ 310 | $ 16

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