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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, 2023 | Dec. 31, 2022
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Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | $ (224) | $ 466
Gross Amounts Offset | 18 | (237)
Net Amounts of Assets/ (Liabilities) | (206) | 229
CECONY |  |
Net fair value derivative assets/(liabilities) |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (202) | 294
Gross Amounts Offset | 17 | (214)
Net Amounts of Assets/ (Liabilities) | (185) | 80
Clean Energy Businesses | Interest Rate Swap |  |
Net fair value derivative assets/(liabilities) |  |
Notional amount |  | 982
Fair Value of Derivative Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (230) | (198)
Gross Amounts Offset | 52 | 166
Net Amounts of Assets/ (Liabilities) | (178) | (32)
Fair Value of Derivative Liabilities, Current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (217) | (189)
Gross Amounts Offset | 48 | 160
Net Amounts of Assets/ (Liabilities) | (169) | (29)
Fair Value of Derivative Liabilities, Non-current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (154) | (49)
Gross Amounts Offset | 33 | 36
Net Amounts of Assets/ (Liabilities) | (121) | (13)
Fair Value of Derivative Liabilities, Non-current | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (139) | (43)
Gross Amounts Offset | 31 | 34
Net Amounts of Assets/ (Liabilities) | (108) | (9)
Fair Value of Derivative Liabilities, Held and Used Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (384) | (247)
Gross Amounts Offset | 85 | 202
Net Amounts of Assets/ (Liabilities) | (299) | (45)
Fair Value of Derivative Liabilities, Held for Sale Liabilities, Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 0 | (31)
Gross Amounts Offset | 0 | 6
Net Amounts of Assets/ (Liabilities) | 0 | (25)
Fair Value of Derivative Liabilities, Held for Sale Liabilities, Non-Current |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 0 | (3)
Gross Amounts Offset | 0 | (8)
Net Amounts of Assets/ (Liabilities) | 0 | (11)
Fair Value of Derivative Liabilities |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (384) | (281)
Gross Amounts Offset | 85 | 200
Net Amounts of Assets/ (Liabilities) | (299) | (81)
Net fair value derivative assets/(liabilities) |  |
Margin deposit liability | (15) | (10)
Fair Value of Derivative Liabilities | CECONY |  |
Fair value of derivative liabilities |  |
Gross Amounts of Recognized Assets/ (Liabilities) | (356) | (232)
Gross Amounts Offset | 79 | 194
Net Amounts of Assets/ (Liabilities) | (277) | (38)
Net fair value derivative assets/(liabilities) |  |
Margin deposit liability | (10) | (6)
Fair Value of Derivative Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 83 | 378
Gross Amounts Offset | (38) | (332)
Net Amounts of Assets/ (Liabilities) | 45 | 46
Fair Value of Derivative Assets, Current | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) |  | 31
Fair Value of Derivative Assets, Current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 78 | 350
Gross Amounts Offset | (35) | (312)
Net Amounts of Assets/ (Liabilities) | 43 | 38
Fair Value of Derivative Assets, Non-current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 77 | 193
Gross Amounts Offset | (29) | (108)
Net Amounts of Assets/ (Liabilities) | 48 | 85
Fair Value of Derivative Assets, Non-current | Interest Rate Swap |  |
Fair value of derivative assets |  |
Net Amounts of Assets/ (Liabilities) |  | 75
Fair Value of Derivative Assets, Non-current | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 76 | 176
Gross Amounts Offset | (27) | (96)
Net Amounts of Assets/ (Liabilities) | 49 | 80
Fair Value of Derivative Assets, Held and Used Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 160 | 571
Gross Amounts Offset | (67) | (440)
Net Amounts of Assets/ (Liabilities) | 93 | 131
Fair Value of Derivative Assets, Held-For-Sale Assets, Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 0 | 93
Gross Amounts Offset | 0 | (8)
Net Amounts of Assets/ (Liabilities) | 0 | 85
Fair Value of Derivative Assets, Held-For Sale Assets, Non-Current |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 0 | 83
Gross Amounts Offset | 0 | 11
Net Amounts of Assets/ (Liabilities) | 0 | 94
Fair Value of Derivative Assets |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 160 | 747
Gross Amounts Offset | (67) | (437)
Net Amounts of Assets/ (Liabilities) | 93 | 310
Net fair value derivative assets/(liabilities) |  |
Margin deposits | 7 | 13
Fair Value of Derivative Assets | CECONY |  |
Fair value of derivative assets |  |
Gross Amounts of Recognized Assets/ (Liabilities) | 154 | 526
Gross Amounts Offset | (62) | (408)
Net Amounts of Assets/ (Liabilities) | 92 | $ 118
Net fair value derivative assets/(liabilities) |  |
Margin deposits | $ 6 |

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