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Commitments and Contingencies (Guarantee Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2008
Customer Lines Of Credit For Brazilian Subsidiary      
Guarantor Obligations [Line Items]      
Guarantor obligations, maximum exposure, undiscounted $ 260,000,000 $ 492,000,000  
Loss associated with Brazilian subsidiary guarantee 0 0  
Indebtedness And Lines of Credit For Various Consolidated Subsidiaries      
Guarantor Obligations [Line Items]      
Guarantor obligations, maximum exposure, undiscounted 2,000,000,000 $ 1,400,000,000  
Line of Credit      
Guarantor Obligations [Line Items]      
Guarantor obligations, maximum exposure, undiscounted $ 43,000,000    
Guarantor obligations, term     5 years