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Post-Employment and Other Non-current Employee Benefits - Summary of Long-Term Assumptions (Detail)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial:      
Discount rate used to calculate the defined benefit obligation and the net interest on de net defined benefit liability (asset) 7.20% 7.50% 9.40%
Salary increase 4.50% 4.50% 4.60%
Future pension increase 3.50% 3.50% 3.60%
Biometric:      
Normal retirement age 60 years 60 years 60 years