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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Long-Term Targeted Asset Allocation Ranges) (Details) - Pension Plans [Member]	Dec. 31, 2020
Global Equities [Member] | Minimum [Member]
Long-term targeted asset allocation	26.00%
Global Equities [Member] | Maximum [Member]
Long-term targeted asset allocation	38.00%
Fixed Income Securities [Member] | Minimum [Member]
Long-term targeted asset allocation	44.00%
Fixed Income Securities [Member] | Maximum [Member]
Long-term targeted asset allocation	64.00%
Alternative Securities [Member] | Minimum [Member]
Long-term targeted asset allocation	10.00%
Alternative Securities [Member] | Maximum [Member]
Long-term targeted asset allocation	16.00%
Cash and Cash Equivalents [Member] | Minimum [Member]
Long-term targeted asset allocation	0.00%
Cash and Cash Equivalents [Member] | Maximum [Member]
Long-term targeted asset allocation	5.00%

X

- 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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