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Commitments and Contingencies (Guarantee Narrative) (Details)
R$ in Millions, $ in Millions
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Customer Lines of Credit for Brazilian Subsidiary        
Guarantor Obligations [Line Items]        
Guarantor obligations, maximum exposure, undiscounted R$ 831 $ 160 R$ 577 $ 143
Indebtedness And Lines of Credit for Various Consolidated Subsidiaries        
Guarantor Obligations [Line Items]        
Guarantor obligations, maximum exposure, undiscounted   $ 3,500   $ 2,600