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Commitments and Contingencies (Guarantee Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Customer Lines Of Credit For Brazilian Subsidiary    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted $ 284,000,000 $ 258,000,000
Guarantees, fair value 0 0
Indebtedness And Lines of Credit For Various Consolidated Subsidiaries    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 2,800,000,000.0 2,400,000,000
Line of Credit    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 16,000,000.000 40,000,000
Guarantor obligations, current carrying value $ 49,000,000 32,000,000
Guarantor obligations, term 5 years  
Guarantor obligations, fair value $ 0 $ 0