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Commitments and Contingencies Guarantees (Details) - USD ($)
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Customer Lines Of Credit For Brazilian Subsidiary    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted $ 243,000,000 $ 260,000,000
Guarantee of Indebtedness of Others    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 1,800,000,000.0 2,000,000,000
Line of Credit    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 43,000,000  
Guarantor Obligations, current carrying value $ 43,000,000 $ 20,000,000
Guarantor obligations, term 5 years