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Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | $ 783 | $ 723
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | (89) | (224)
Gross Amounts Offset | 18 | 18
Net Amounts of Assets/ (Liabilities) | (71) | (206)
CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) | 753 | 699
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/(Liabilities) | (78) | (202)
Gross Amounts Offset | 15 | 17
Net Amounts of Assets/ (Liabilities) | (63) | (185)
Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (164) | (230)
Gross Amounts Offset | 58 | 52
Net Amounts of Assets/ (Liabilities) | (106) | (178)
Current | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (156) | (217)
Gross Amounts Offset | 55 | 48
Net Amounts of Assets/ (Liabilities) | (101) | (169)
Noncurrent |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (123) | (154)
Gross Amounts Offset | 29 | 33
Net Amounts of Assets/ (Liabilities) | (94) | (121)
Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (112) | (139)
Gross Amounts Offset | 27 | 31
Net Amounts of Assets/ (Liabilities) | (85) | (108)
Total fair value of derivative liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/(Liabilities) | (287) | (384)
Gross Amounts Offset | 87 | 85
Net Amounts of Assets/ (Liabilities) | (200) | (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) | (268) | (356)
Gross Amounts Offset | 82 | 79
Net Amounts of Assets/ (Liabilities) | (186) | (277)
Net fair value derivative assets/(liabilities) |  |
Margin deposit liability | (2) |
Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 127 | 83
Gross Amounts Offset | (46) | (38)
Net Amounts of Assets/ (Liabilities) | 81 | 45
Current | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 121 | 78
Gross Amounts Offset | (45) | (35)
Net Amounts of Assets/ (Liabilities) | 76 | 43
Noncurrent |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 71 | 77
Gross Amounts Offset | (23) | (29)
Net Amounts of Assets/ (Liabilities) | 48 | 48
Noncurrent | CECONY | Subsidiaries |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 69 | 76
Gross Amounts Offset | (22) | (27)
Net Amounts of Assets/ (Liabilities) | 47 | 49
Total fair value of derivative assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/(Liabilities) | 198 | 160
Gross Amounts Offset | (69) | (67)
Net Amounts of Assets/ (Liabilities) | 129 | 93
Net fair value derivative assets/(liabilities) |  |
Margin deposits assets | 7 | 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) | 190 | 154
Gross Amounts Offset | (67) | (62)
Net Amounts of Assets/ (Liabilities) | 123 | $ 92
Net fair value derivative assets/(liabilities) |  |
Margin deposits assets | $ 6 |

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