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Commitments and Contingencies - Guarantees (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Customer Lines Of Credit For Brazilian Subsidiary    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted $ 202,000,000 $ 284,000,000
Guarantee of Indebtedness of Others    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 2,800,000,000 2,800,000,000.0
Line of Credit    
Guarantor Obligations [Line Items]    
Guarantor obligations, current carrying value 95,000,000 49,000,000
Guarantor obligations, fair value $ 0 $ 0