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Material Contingencies - Total Guarantees (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 2,157 | $ 2,042
Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 490 |
Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 831 |
Renewable electric projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 766 |
Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 70 |
0 – 3 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 1,348 |
0 – 3 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 490 |
0 – 3 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 469 |
0 – 3 years | Renewable electric projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 319 |
0 – 3 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 70 |
4 – 10 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 88 |
4 – 10 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 37 |
4 – 10 years | Renewable electric projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 51 |
4 – 10 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
> 10 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 721 |
> 10 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
> 10 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 325 |
> 10 years | Renewable electric projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 396 |
> 10 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 0 |

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