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Pension, OPEB and Savings Plans (Schedule Of Percentage Of Fair Value Of Total Plan Assets) (Details) | Dec. 31, 2019 | Dec. 31, 2018
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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 | 59.00% |
Actual plan asset allocation, percent | 68.00% | 66.00%
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 23.00% |
Actual plan asset allocation, percent | 26.00% | 32.00%
Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation percentage of assets | 18.00% |
Actual plan asset allocation, percent | 6.00% | 2.00%
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 | 72.00% | 67.00%
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 | 28.00% | 33.00%
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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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