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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, 2021
Dec. 31, 2020
Overfunded pension plans    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year $ 864 $ 1,298
Interest income 58 74
Changes on asset ceiling and onerous liability 60 (278)
Translation adjustment (63) (230)
Benefit obligation (Plan assets) as at end of the year 919 864
Overfunded pension plans | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 864 1,298
Interest income 58 74
Changes on asset ceiling and onerous liability 16 (278)
Translation adjustment (62) (230)
Benefit obligation (Plan assets) as at end of the year 876 864
Overfunded pension plans | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Changes on asset ceiling and onerous liability 44  
Benefit obligation (Plan assets) as at end of the year 44  
Overfunded pension plans | Present value of the defined benefit obligations    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 3,105 4,006
Interest income 196 222
Translation adjustment (208) (880)
Benefit obligation (Plan assets) as at end of the year 2,833 3,105
Overfunded pension plans | Present value of the defined benefit obligations | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 3,105  
Benefit obligation (Plan assets) as at end of the year 2,572 3,105
Overfunded pension plans | Present value of the defined benefit obligations | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at end of the year 261  
Overfunded pension plans | Plan assets    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 3,969 5,304
Interest income 253 298
Translation adjustment (276) (1,112)
Benefit obligation (Plan assets) as at end of the year 3,752 3,969
Overfunded pension plans | Plan assets | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (3,969)  
Benefit obligation (Plan assets) as at end of the year (3,448) (3,969)
Overfunded pension plans | Plan assets | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at end of the year (305)  
Overfunded pension plans | Asset ceiling    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 864  
Benefit obligation (Plan assets) as at end of the year 919 864
Overfunded pension plans | Asset ceiling | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 864  
Benefit obligation (Plan assets) as at end of the year 876 864
Overfunded pension plans | Asset ceiling | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at end of the year 44  
Underfunded pension plans    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 641  
Benefit obligation (Plan assets) as at end of the year 204 641
Current liabilities (47) (47)
Non-current liabilities (157) (594)
Liabilities (204) (641)
Underfunded pension plans | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 208  
Benefit obligation (Plan assets) as at end of the year 143 208
Current liabilities (40) (32)
Non-current liabilities (103) (176)
Liabilities (143) (208)
Underfunded pension plans | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 432  
Benefit obligation (Plan assets) as at end of the year 61 432
Current liabilities (7) (7)
Non-current liabilities (54) (425)
Liabilities (61) (432)
Underfunded pension plans | Present value of the defined benefit obligations    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 4,632 4,421
Interest income 122 134
Translation adjustment (10) 1
Benefit obligation (Plan assets) as at end of the year 3,983 4,632
Underfunded pension plans | Present value of the defined benefit obligations | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 317  
Benefit obligation (Plan assets) as at end of the year 237 317
Underfunded pension plans | Present value of the defined benefit obligations | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 4,315  
Benefit obligation (Plan assets) as at end of the year 3,746 4,315
Underfunded pension plans | Plan assets    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 3,992 3,726
Interest income 102 109
Translation adjustment 2 46
Benefit obligation (Plan assets) as at end of the year 3,779 3,992
Underfunded pension plans | Plan assets | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (109)  
Benefit obligation (Plan assets) as at end of the year (94) (109)
Underfunded pension plans | Plan assets | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year (3,883)  
Benefit obligation (Plan assets) as at end of the year (3,685) (3,883)
Other benefits    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,733  
Benefit obligation (Plan assets) as at end of the year 1,428 1,733
Current liabilities (52) (96)
Non-current liabilities (1,376) (1,637)
Liabilities (1,428) (1,733)
Other benefits | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 465  
Benefit obligation (Plan assets) as at end of the year 301 465
Current liabilities (5) (49)
Non-current liabilities (296) (416)
Liabilities (301) (465)
Other benefits | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,268  
Benefit obligation (Plan assets) as at end of the year 1,127 1,268
Current liabilities (47) (47)
Non-current liabilities (1,080) (1,221)
Liabilities (1,127) (1,268)
Other benefits | Present value of the defined benefit obligations    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,733 1,505
Interest income 33 64
Translation adjustment (23) (44)
Benefit obligation (Plan assets) as at end of the year 1,427 1,733
Other benefits | Present value of the defined benefit obligations | Plans in Brazil    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 465  
Benefit obligation (Plan assets) as at end of the year 301 465
Other benefits | Present value of the defined benefit obligations | Foreign plan    
Reconciliation of net liabilities recognized in the statement of financial position    
Benefit obligation (Plan assets) as at beginning of the year 1,268  
Benefit obligation (Plan assets) as at end of the year $ 1,127 $ 1,268