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Employee Benefit Plans (The Weighted-Average Discount Rate Assumptions Used to Determine the Projected Benefit Obligations) (Detail)	Dec. 31, 2021	Dec. 31, 2020
Unfunded Supplemental Benefit Plans
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined benefit pension plans, Discount rate	2.89%	2.49%

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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Period Type:	instant

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
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