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Post-employment benefits for associates (Details 8) - Pension plans - USD ($)
shares in Millions, $ in Billions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Defined benefit plan, plan asset allocations 100.00% 100.00%
Shares held by defined benefit plan 2.3 2.3
Value of shares held by defined benefit plan $ 0.2 $ 0.2
Weighted average duration of defined benefit obligation years 15 years 4 months 25 days 15 years 2 months 13 days
Equity securities    
Disclosure of defined benefit plans [line items]    
Defined benefit plan, target plan asset allocations range minimum 15.00%  
Defined benefit plan, target plan asset allocations range maximum 40.00%  
Defined benefit plan, plan asset allocations 28.00% 27.00%
Debt securities    
Disclosure of defined benefit plans [line items]    
Defined benefit plan, target plan asset allocations range minimum 20.00%  
Defined benefit plan, target plan asset allocations range maximum 60.00%  
Defined benefit plan, plan asset allocations 34.00% 36.00%
Real estate    
Disclosure of defined benefit plans [line items]    
Defined benefit plan, target plan asset allocations range minimum 5.00%  
Defined benefit plan, target plan asset allocations range maximum 20.00%  
Defined benefit plan, plan asset allocations 17.00% 17.00%
Alternative investments    
Disclosure of defined benefit plans [line items]    
Defined benefit plan, target plan asset allocations range minimum 0.00%  
Defined benefit plan, target plan asset allocations range maximum 20.00%  
Defined benefit plan, plan asset allocations 13.00% 15.00%
Cash and other investments    
Disclosure of defined benefit plans [line items]    
Defined benefit plan, target plan asset allocations range minimum 0.00%  
Defined benefit plan, target plan asset allocations range maximum 15.00%  
Defined benefit plan, plan asset allocations 8.00% 5.00%