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Employee Benefits and Private Pension Plan - Significant actuarial assumptions adopted (Detail)
Dec. 31, 2022
Dec. 31, 2021
Employee benefits and private pension plan    
Discount rate for the actuarial obligation at present value 9.97% 8.93%
Average projected salary growth rate 6.98% 7.07%
Inflation rate (long term) 3.50% 3.25%
Growth rate of medical services 7.64% 7.38%