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Pension, OPEB and Savings Plans (Schedule Of Percentage Of Fair Value Of Total Plan Assets) (Details) | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation, percent | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 54.00% |
Actual plan asset allocation, percent | 63.00% | 67.00%
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 28.00% |
Actual plan asset allocation, percent | 28.00% | 25.00%
Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 18.00% |
Actual plan asset allocation, percent | 9.00% | 8.00%
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%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 60.00% |
Actual plan asset allocation, percent | 76.00% | 75.00%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 25.00% |
Actual plan asset allocation, percent | 24.00% | 25.00%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 15.00% |

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- Definition Percentage of target 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/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- 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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