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Income taxes - Changes in deferred tax (Details)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Total        
Balance at beginning of period   $ 7,335 $ (5,376)  
Effect in income statement   2,960 2,117 $ 924
Acquisition of subsidiaries     (146)  
Translation adjustment   (1,774) (234)  
Other comprehensive income   44 222  
Balance at end of period   8,565 7,335 (5,376)
Assets        
Balance at beginning of period   9,217 6,908  
Effect in income statement   2,852 1,907  
Transfers between asset and liabilities   38 252  
Acquisition of subsidiaries     104  
Translation adjustment   (1,811) (187)  
Other comprehensive income   39 233  
Balance at end of period   10,335 9,217 6,908
Liabilities        
Balance at beginning of period R$ 1,882 1,882 1,532 362
Effect in income statement   (108) (210)  
Transfers between asset and liabilities   38 252  
Acquisition of subsidiaries     250  
Translation adjustment   (37) 47  
Other comprehensive income   (5) 11  
Balance at end of period   $ 1,770 1,882 $ 1,532
Limitation of tax loss carryforward in Brazil, as percent of taxable income 30.00% 30.00%    
Tax losses carryforward        
Total        
Balance at beginning of period   $ 4,659    
Effect in income statement   374    
Balance at end of period   4,328 4,659  
Assets        
Effect in income statement   374    
Employee post retirement obligations        
Total        
Balance at beginning of period   840    
Balance at end of period   744 840  
Provision For litigation        
Total        
Balance at beginning of period   443    
Balance at end of period   356 443  
Timing differences arising on assets and liabilities        
Total        
Balance at beginning of period   3,246    
Effect in income statement   1,690 2,113  
Balance at end of period   4,331 3,246  
Assets        
Effect in income statement   1,690 2,113  
Fair value of financial instruments        
Total        
Balance at beginning of period   864    
Effect in income statement   756 328  
Balance at end of period   1,355 864  
Assets        
Effect in income statement   756 328  
Allocated goodwill        
Total        
Balance at beginning of period   (2,640)    
Effect in income statement   108 210  
Balance at end of period   (2,623) (2,640)  
Liabilities        
Effect in income statement   (108) (210)  
Others        
Total        
Balance at beginning of period   401    
Effect in income statement   32 (91)  
Balance at end of period   516 401  
Assets        
Effect in income statement   32 (91)  
Temporary differences        
Total        
Balance at beginning of period   2,676    
Balance at end of period   $ 4,237 2,676  
Utilization of taxes losses carryforward        
Total        
Effect in income statement     (443)  
Assets        
Effect in income statement     $ (443)