Pension, OPEB and Savings Plans (Assumptions Used To Determine The Benefit Obligations And Net Periodic Benefit Costs) (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	5.02%	5.20%	2.94%
Expected Return on Plan Assets	8.10%	7.20%	7.70%
Rate of Compensation Increase	4.60%	4.40%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate	6.00%	6.00%	6.00%
Service Cost Interest Rate	5.31%	3.19%	2.94%
Interest Cost Interest Rate	5.09%	2.37%	1.91%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.40%	4.40%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate	6.00%	6.00%	6.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.20%	2.94%	2.61%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.96%	5.16%	2.82%
Expected Return on Plan Assets	8.10%	7.20%	7.69%
Rate of Compensation Increase	4.60%	4.40%	4.40%
Service Cost Interest Rate	5.23%	3.06%	2.76%
Interest Cost Interest Rate	5.07%	2.21%	1.70%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.40%	4.40%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.16%	2.82%	2.46%
Immediate Rate	8.89%	6.98%	6.14%
Ultimate Rate	4.75%	4.75%	4.75%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	5.13%	5.30%	3.21%
Expected Return on Plan Assets	8.00%
Rate of Compensation Increase	5.54%	3.95%	3.95%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate	4.13%	4.30%	3.75%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	5.16%	5.34%	3.28%
Rate of Compensation Increase	5.54%	3.95%	3.95%
Immediate Rate	6.84%	6.71%	6.48%
Ultimate Rate	4.75%	4.75%	4.75%