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Post-employment benefits for employees (Details 6) - Other post-employment benefit plans
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Healthcare cost trend rate assumed for next year 6.50% 6.00% 6.30%
Rate to which the cost trend rate is assumed to decline 4.50% 4.50% 4.50%
Year that the rate reaches the ultimate trend rate 2031 2028 2028