Employee Benefit Plans (Schedule Of Investment Asset Allocation To Benchmarking) (Details)	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Portfolio, actual asset allocation	100.00%
Benchmark, target asset allocation	100.00%
Cash and Short-Term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, actual asset allocation	5.00%
Benchmark, target asset allocation	6.00%
U.S. Stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, actual asset allocation	52.00%
Benchmark, target asset allocation	57.00%
International Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, actual asset allocation	15.00%
Benchmark, target asset allocation	10.00%
U.S. Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, actual asset allocation	23.00%
Benchmark, target asset allocation	23.00%
International Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, actual asset allocation	4.00%
Benchmark, target asset allocation	3.00%
Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, actual asset allocation	1.00%
Benchmark, target asset allocation	1.00%

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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

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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
-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

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