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Material Contingencies - Guarantees (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 72 | $ 175
Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 63 |
Broken Bow II |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 9 |
0 – 3 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 63 |
0 – 3 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 63 |
0 – 3 years | Broken Bow II |  |
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 | 9 |
Greater than 10 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
Greater than 10 years | Broken Bow II |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 9 |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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