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Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value of derivative assets |  |
Net Amounts of Assets (Liabilities) | $ 727 | $ 723
Net fair value derivative assets (liabilities) |  |
Gross Amounts of Recognized Assets (Liabilities) | (103) | (224)
Gross Amounts Offset | 9 | 18
Net Amounts of Assets/ (Liabilities) | (94) | (206)
CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Net Amounts of Assets (Liabilities) | 698 | 699
Net fair value derivative assets (liabilities) |  |
Gross Amounts of Recognized Assets (Liabilities) | (94) | (202)
Gross Amounts Offset | 9 | 17
Net Amounts of Assets/ (Liabilities) | (85) | (185)
Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (131) | (230)
Gross Amounts Offset | 55 | 52
Net Amounts of Assets/ (Liabilities) | (76) | (178)
Current | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (122) | (217)
Gross Amounts Offset | 53 | 48
Net Amounts of Assets/ (Liabilities) | (69) | (169)
Noncurrent |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (107) | (154)
Gross Amounts Offset | 33 | 33
Net Amounts of Assets/ (Liabilities) | (74) | (121)
Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (97) | (139)
Gross Amounts Offset | 32 | 31
Net Amounts of Assets/ (Liabilities) | (65) | (108)
Total fair value of derivative liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (238) | (384)
Gross Amounts Offset | 88 | 85
Net Amounts of Assets/ (Liabilities) | (150) | (299)
Net fair value derivative assets (liabilities) |  |
Margin deposit liability | (7) | (15)
Total fair value of derivative liabilities | CECONY |  |
Net fair value derivative assets (liabilities) |  |
Margin deposit liability |  | (10)
Total fair value of derivative liabilities | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (219) | (356)
Gross Amounts Offset | 85 | 79
Net Amounts of Assets/ (Liabilities) | (134) | (277)
Net fair value derivative assets (liabilities) |  |
Margin deposit liability | (2) |
Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 84 | 83
Gross Amounts Offset | (49) | (38)
Net Amounts of Assets (Liabilities) | 35 | 45
Current | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 78 | 78
Gross Amounts Offset | (48) | (35)
Net Amounts of Assets (Liabilities) | 30 | 43
Noncurrent |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 51 | 77
Gross Amounts Offset | (30) | (29)
Net Amounts of Assets (Liabilities) | 21 | 48
Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 47 | 76
Gross Amounts Offset | (28) | (27)
Net Amounts of Assets (Liabilities) | 19 | 49
Total fair value of derivative assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 135 | 160
Gross Amounts Offset | (79) | (67)
Net Amounts of Assets (Liabilities) | 56 | 93
Net fair value derivative assets (liabilities) |  |
Margin deposits assets | 3 | 7
Total fair value of derivative assets | CECONY |  |
Net fair value derivative assets (liabilities) |  |
Margin deposits assets |  | 6
Total fair value of derivative assets | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 125 | 154
Gross Amounts Offset | (76) | (62)
Net Amounts of Assets (Liabilities) | 49 | $ 92
Net fair value derivative assets (liabilities) |  |
Margin deposits assets | $ 3 |

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