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Employee Benefit Plans (The Weighted-Average Discount Rate Assumptions Used to Determine Net Periodic Benefit Costs) (Detail) - Unfunded Supplemental Benefit Plans	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Discount rates:
Projected benefit obligation	2.49%	3.27%	4.32%
Service cost	3.14%	3.71%	4.55%
Interest cost	1.83%	2.86%	4.00%

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost discount rate for interest cost.

+ References

No definition available.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost discount rate for service cost.

+ References

No definition available.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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

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- References

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