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Commitments and Contingencies (Guarantee Narrative) (Details)
R$ in Millions
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
Customer Lines of Credit for Brazilian Subsidiary        
Guarantor Obligations [Line Items]        
Guarantor obligations, maximum exposure, undiscounted R$ 577 $ 143,000,000 R$ 566 $ 146,000,000
Indebtedness And Lines of Credit for Various Consolidated Subsidiaries        
Guarantor Obligations [Line Items]        
Guarantor obligations, maximum exposure, undiscounted   2,600,000,000   3,500,000,000
Line of Credit        
Guarantor Obligations [Line Items]        
Guarantor obligations, fair value   0   0
Guarantor obligations, current carrying value   $ 0   $ 0