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Objectives And Strategies For Using Derivatives Summary of total and undesignated fair values of derivative instruments (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative    
Assets $ 69 $ 61
Liabilities 57 63
Foreign currency exchange contracts
   
Derivative    
Assets 52 52
Liabilities 55 17
Interest rate contracts
   
Derivative    
Assets 16 7
Liabilities 1 43
Commodity price contracts
   
Derivative    
Assets 1 2
Liabilities $ 1 $ 3