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Pension, Other Postretirement Benefits (OPEB) and Savings Plans - Schedule of Percentage of Fair Value of Total Plan Assets (Details) | Dec. 31, 2024 | Dec. 31, 2023
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Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 100.00% | 100.00%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 67.00% | 63.00%
Equity Securities [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 76.00% | 76.00%
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 25.00% | 28.00%
Fixed Income Securities [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 24.00% | 24.00%
Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 8.00% | 9.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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