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Commitments and Contingencies Guarantees (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Customer Lines Of Credit For Brazilian Subsidiary
   
Guarantor Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 455 $ 449
Guarantee of Indebtedness of Others
   
Guarantor Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 1,400 1,400
Line of Credit
   
Guarantor Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 50