Pension, OPEB and Savings Plans (Schedule Of Percentage Of Fair Value Of Total Plan Assets) (Details)	Dec. 31, 2023	Dec. 31, 2022
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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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

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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

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