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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, 2024 | Dec. 31, 2023
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Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | $ (105) | $ (224)
Gross Amounts Offset | 3 | 18
Net Amounts of Assets/ (Liabilities) | (102) | (206)
CECONY |  |
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (92) | (202)
Gross Amounts Offset | 2 | 17
Net Amounts of Assets/ (Liabilities) | (90) | (185)
Fair Value of Derivative Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (92) | (230)
Gross Amounts Offset | 44 | 52
Net Amounts of Assets/ (Liabilities) | (48) | (178)
Fair Value of Derivative Liabilities, Current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (84) | (217)
Gross Amounts Offset | 42 | 48
Net Amounts of Assets/ (Liabilities) | (42) | (169)
Fair Value of Derivative Liabilities, Non-current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (108) | (154)
Gross Amounts Offset | 12 | 33
Net Amounts of Assets/ (Liabilities) | (96) | (121)
Fair Value of Derivative Liabilities, Non-current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (95) | (139)
Gross Amounts Offset | 11 | 31
Net Amounts of Assets/ (Liabilities) | (84) | (108)
Fair Value of Derivative Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (200) | (384)
Gross Amounts Offset | 56 | 85
Net Amounts of Assets/ (Liabilities) | (144) | (299)
Net fair value derivative assets/(liabilities) |  |
Margin deposit liability | (4) | (15)
Fair Value of Derivative Liabilities | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (179) | (356)
Gross Amounts Offset | 53 | 79
Net Amounts of Assets/ (Liabilities) | (126) | (277)
Net fair value derivative assets/(liabilities) |  |
Margin deposit liability | (2) | (10)
Fair Value of Derivative Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 56 | 83
Gross Amounts Offset | (41) | (38)
Net Amounts of Assets/ (Liabilities) | 15 | 45
Fair Value of Derivative Assets, Current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 51 | 78
Gross Amounts Offset | (40) | (35)
Net Amounts of Assets/ (Liabilities) | 11 | 43
Fair Value of Derivative Assets, Non-current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 39 | 77
Gross Amounts Offset | (12) | (29)
Net Amounts of Assets/ (Liabilities) | 27 | 48
Fair Value of Derivative Assets, Non-current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 36 | 76
Gross Amounts Offset | (11) | (27)
Net Amounts of Assets/ (Liabilities) | 25 | 49
Fair Value of Derivative Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 95 | 160
Gross Amounts Offset | (53) | (67)
Net Amounts of Assets/ (Liabilities) | 42 | 93
Net fair value derivative assets/(liabilities) |  |
Margin deposits |  | 7
Fair Value of Derivative Assets | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 87 | 154
Gross Amounts Offset | (51) | (62)
Net Amounts of Assets/ (Liabilities) | $ 36 | 92
Net fair value derivative assets/(liabilities) |  |
Margin deposits |  | $ 6

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