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Commitments and Contingencies (Guarantee Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2008
Dec. 31, 2016
Dec. 31, 2015
Customer Lines Of Credit For Brazilian Subsidiary      
Guarantor Obligations [Line Items]      
Guarantor obligations, maximum exposure, undiscounted   $ 258,000,000 $ 260,000,000
Guarantees, fair value   0 0
Indebtedness And Lines of Credit For Various Consolidated Subsidiaries      
Guarantor Obligations [Line Items]      
Guarantor obligations, maximum exposure, undiscounted   2,400,000,000.0 2,000,000,000
Line of Credit      
Guarantor Obligations [Line Items]      
Guarantor obligations, maximum exposure, undiscounted   40,000,000.00 43,000,000
Guarantees, fair value   0 0
Guarantor obligations, current carrying value   $ 0 $ 0
Guarantor obligations, term 5 years