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Other Material Contingencies - Guarantees (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 2,251 | $ 2,042
Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 570 |
Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 815 |
Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 796 |
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 | 1,310 |
0 – 3 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 393 |
0 – 3 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 455 |
0 – 3 years | Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 392 |
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 | 277 |
4 – 10 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 177 |
4 – 10 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 52 |
4 – 10 years | Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 48 |
4 – 10 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
Greater than 10 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 664 |
Greater than 10 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
Greater than 10 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 308 |
Greater than 10 years | Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 356 |
Greater than 10 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 0 |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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