Employee Benefit Plans (Schedule Of Investment Asset Allocation To Benchmarking) (Details)	12 Months Ended
Dec. 31, 2016
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	2.00%
Benchmark, Target asset allocation	1.00%
U.S. Stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, Actual asset allocation	51.00%
Benchmark, Target asset allocation	56.00%
International Stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, Actual asset allocation	12.00%
Benchmark, Target asset allocation	10.00%
U.S. Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, Actual asset allocation	29.00%
Benchmark, Target asset allocation	29.00%
International Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, Actual asset allocation	5.00%
Benchmark, Target asset allocation	4.00%
Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Portfolio, Actual asset allocation	1.00%
Benchmark, Target asset allocation	0.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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