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Employee Benefits - Weighted Average Assumptions to Determine Projected Benefit Obligations (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Projected Benefit Obligation Assumptions [Member] | Prior to age 65 [Member]    
Health care cost trend rate    
Health care cost trend rate 5.75% 6.00%
Projected Benefit Obligation Assumptions [Member] | After age 65 [Member]    
Health care cost trend rate    
Health care cost trend rate 5.75% 6.00%
Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.00% 2.75%
Cash balance interest crediting rate 3.00% 3.00%
Rate of compensation increase 3.56% 3.56%
Postretirement Welfare Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 2.37% 1.82%