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Post-employment benefits for associates - Healthcare cost trend rate assumptions used for other post-employment benefits (Details) - Other post-employment benefit plans [member]
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Healthcare cost trend rate assumed for next year 6.20% 6.50% 7.00%
Rate to which the cost trend rate is assumed to decline 4.50% 4.50% 4.50%