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Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | $ 697 | $ 675
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (386) | (478)
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | (261) | (366)
Gross Amounts Offset | 5 | 3
Net Amounts of Assets/ (Liabilities) | (256) | (363)
Margin deposits | 1 | 3
Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 11 | 0
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (58) | (106)
CECONY |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 570 | 550
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | (217) | (252)
Gross Amounts Offset | (1) | 0
Net Amounts of Assets/ (Liabilities) | (218) | (252)
Margin deposits | 1 |
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount | 1,103 | 863
Fair Value of Derivative Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (236) | (225)
Gross Amounts Offset | 5 | (13)
Net Amounts of Assets/ (Liabilities) | (231) | (238)
Fair Value of Derivative Liabilities, Current | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (27) | (24)
Fair Value of Derivative Liabilities, Current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (184) | (174)
Gross Amounts Offset | 22 | 11
Net Amounts of Assets/ (Liabilities) | (162) | (163)
Fair Value of Derivative Liabilities, Noncurrent |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (131) | (207)
Gross Amounts Offset | (24) | (33)
Net Amounts of Assets/ (Liabilities) | (155) | (240)
Fair Value of Derivative Liabilities, Noncurrent | Interest Rate Swap |  |
Fair value of derivative liabilities |  |
Net Amounts of Assets/ (Liabilities) | (30) | (82)
Fair Value of Derivative Liabilities, Noncurrent | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (93) | (114)
Gross Amounts Offset | 9 | 9
Net Amounts of Assets/ (Liabilities) | (84) | (105)
Fair Value of Derivative Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (367) | (432)
Gross Amounts Offset | (19) | (46)
Net Amounts of Assets/ (Liabilities) | (386) | (478)
Fair Value of Derivative Liabilities | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (277) | (288)
Gross Amounts Offset | 31 | 20
Net Amounts of Assets/ (Liabilities) | (246) | (268)
Fair Value of Derivative Assets, Noncurrent | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 11 |
Fair Value of Derivative Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 75 | 44
Gross Amounts Offset | (1) | 14
Net Amounts of Assets/ (Liabilities) | 74 | 58
Fair Value of Derivative Assets, Current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 47 | 20
Gross Amounts Offset | (23) | (12)
Net Amounts of Assets/ (Liabilities) | 24 | 8
Fair Value of Derivative Assets, Noncurrent |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 31 | 22
Gross Amounts Offset | 25 | 35
Net Amounts of Assets/ (Liabilities) | 56 | 57
Fair Value of Derivative Assets, Noncurrent | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 13 | 16
Gross Amounts Offset | (9) | (8)
Net Amounts of Assets/ (Liabilities) | 4 | 8
Fair Value of Derivative Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 106 | 66
Gross Amounts Offset | 24 | 49
Net Amounts of Assets/ (Liabilities) | 130 | 115
Fair Value of Derivative Assets | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 60 | 36
Gross Amounts Offset | (32) | (20)
Net Amounts of Assets/ (Liabilities) | $ 28 | $ 16

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