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Commitments and Contingencies Guarantees (Details) (USD $)
In Millions, unless otherwise specified
60 Months Ended
Jun. 30, 2013
Customer Lines Of Credit For Brazilian Subsidiary
Dec. 31, 2012
Customer Lines Of Credit For Brazilian Subsidiary
Jun. 30, 2013
Guarantee of Indebtedness of Others
Dec. 31, 2012
Guarantee of Indebtedness of Others
Dec. 15, 2017
Line of Credit
Jun. 30, 2013
Line of Credit
Guarantor Obligations [Line Items]            
Guarantor Obligations, Maximum Exposure, Undiscounted $ 388 $ 449 $ 1,400 $ 1,400   $ 50
Guarantor Obligations, Term         5