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Material Contingencies - Total Guarantees (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 58 | $ 175
Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 49 |
Broken Bow II (a) |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 9 |
0 – 3 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 49 |
0 – 3 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 49 |
0 – 3 years | Broken Bow II (a) |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
> 10 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 9 |
> 10 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
> 10 years | Broken Bow II (a) |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 9 |

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