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Employee benefits - Reconciliation of net liabilities recognized in the statement of financial position (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Overfunded pension plans    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year $ 1,298 $ 1,220
Interest income 74 110
Changes on asset ceiling and onerous liability (278) 59
Translation adjustment 1,172 (91)
Benefit obligation (Plan assets) as at end of the year 2,266 1,298
Overfunded pension plans | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,298 1,220
Interest income 74 110
Changes on asset ceiling and onerous liability (278) 59
Translation adjustment 1,172 (91)
Benefit obligation (Plan assets) as at end of the year 2,266 1,298
Overfunded pension plans | Present value of actuarial liabilities    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 4,006 3,577
Interest income 222 305
Translation adjustment (880) (167)
Benefit obligation (Plan assets) as at end of the year 3,105 4,006
Overfunded pension plans | Present value of actuarial liabilities | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 4,006  
Benefit obligation (Plan assets) as at end of the year 3,105 4,006
Overfunded pension plans | Fair value of assets    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (5,304) (4,737)
Interest income 298 416
Translation adjustment (1,112) (200)
Benefit obligation (Plan assets) as at end of the year (3,969) (5,304)
Overfunded pension plans | Fair value of assets | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (5,304)  
Benefit obligation (Plan assets) as at end of the year (3,969) (5,304)
Overfunded pension plans | Effect of the asset ceiling    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,298  
Benefit obligation (Plan assets) as at end of the year 864 1,298
Overfunded pension plans | Effect of the asset ceiling | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,298  
Benefit obligation (Plan assets) as at end of the year 864 1,298
Underfunded pension plans    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 695  
Benefit obligation (Plan assets) as at end of the year 641 695
Current liabilities (47) (13)
Non-current liabilities (594) (682)
Liabilities (641) (695)
Underfunded pension plans | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 249  
Benefit obligation (Plan assets) as at end of the year 208 249
Current liabilities (32) (7)
Non-current liabilities (176) (242)
Liabilities (208) (249)
Underfunded pension plans | Foreign    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 446  
Benefit obligation (Plan assets) as at end of the year 432 446
Current liabilities (7) (6)
Non-current liabilities (425) (440)
Liabilities (432) (446)
Underfunded pension plans | Present value of actuarial liabilities    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 4,421 3,929
Interest income 134 153
Translation adjustment 1 160
Benefit obligation (Plan assets) as at end of the year 4,632 4,421
Underfunded pension plans | Present value of actuarial liabilities | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 412  
Benefit obligation (Plan assets) as at end of the year 317 412
Underfunded pension plans | Present value of actuarial liabilities | Foreign    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 4,009  
Benefit obligation (Plan assets) as at end of the year 4,315 4,009
Underfunded pension plans | Fair value of assets    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (3,726) (3,273)
Interest income 109 123
Translation adjustment 46 139
Benefit obligation (Plan assets) as at end of the year (3,992) (3,726)
Underfunded pension plans | Fair value of assets | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (163)  
Benefit obligation (Plan assets) as at end of the year (109) (163)
Underfunded pension plans | Fair value of assets | Foreign    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (3,563)  
Benefit obligation (Plan assets) as at end of the year (3,883) (3,563)
Other benefits    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,504  
Benefit obligation (Plan assets) as at end of the year 1,733 1,504
Current liabilities (96) (76)
Non-current liabilities (1,637) (1,428)
Liabilities (1,733) (1,504)
Other benefits | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 303  
Benefit obligation (Plan assets) as at end of the year 465 303
Current liabilities (49) (20)
Non-current liabilities (416) (283)
Liabilities (465) (303)
Other benefits | Foreign    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,202  
Benefit obligation (Plan assets) as at end of the year 1,268 1,202
Current liabilities (47) (46)
Non-current liabilities (1,221) (1,156)
Liabilities (1,268) (1,202)
Other benefits | Present value of actuarial liabilities    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,505 1,280
Interest income 64 59
Translation adjustment (44) 42
Benefit obligation (Plan assets) as at end of the year 1,733 1,505
Other benefits | Present value of actuarial liabilities | Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 303  
Benefit obligation (Plan assets) as at end of the year 465 303
Other benefits | Present value of actuarial liabilities | Foreign    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,202  
Benefit obligation (Plan assets) as at end of the year $ 1,268 $ 1,202