PENSION (Asset Class) (Detail)	Dec. 31, 2020	Dec. 31, 2019
Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted Average Asset Allocations	54.00%	51.00%
Target Plan Asset Allocations	50.00%
International Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted Average Asset Allocations	15.00%	15.00%
Target Plan Asset Allocations	15.00%
EquitySecuritiesMember
Defined Benefit Plan Disclosure [Line Items]
Weighted Average Asset Allocations	69.00%	66.00%
Target Plan Asset Allocations	65.00%
FixedIncomeFundsMember
Defined Benefit Plan Disclosure [Line Items]
Weighted Average Asset Allocations	31.00%	34.00%
Target Plan Asset Allocations	35.00%
Minimum \| Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	40.00%
Minimum \| International Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	10.00%
Minimum \| EquitySecuritiesMember
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	55.00%
Minimum \| FixedIncomeFundsMember
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	25.00%
Maximum \| Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	60.00%
Maximum \| International Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	20.00%
Maximum \| EquitySecuritiesMember
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	75.00%
Maximum \| FixedIncomeFundsMember
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	45.00%

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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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- Definition

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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