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Commitments and Contingencies - Guarantees (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Customer Lines of Credit for Brazilian Subsidiary    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted $ 97,000,000 $ 284,000,000
Guarantee of Indebtedness of Others    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 3,700,000,000.0 2,800,000,000
Line of Credit    
Guarantor Obligations [Line Items]    
Guarantor obligations, current carrying value $ 43,000,000 $ 49,000,000