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Income Taxes (Tax Returns) (Details)
R$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Minimum    
Income Tax Examination    
Range of tax returns are subject to examination 3 years 3 years
Maximum    
Income Tax Examination    
Range of tax returns are subject to examination 6 years 6 years
Brazil | Corporate income tax    
Income Tax Examination    
Net adjustments of additional taxes, including interest and penalties R$ 640 $ 123
Brazil | Indirect tax    
Income Tax Examination    
Net adjustments of additional taxes, including interest and penalties R$ 95 $ 18