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Objectives And Strategies For Using Derivatives Summary of total and undesignated fair values of derivative instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Derivative    
Assets $ 31 $ 43
Liabilities 39 46
Foreign currency exchange contracts    
Derivative    
Assets 29 38
Liabilities 28 44
Interest rate contracts    
Derivative    
Assets 0 0
Liabilities 9 0
Commodity price contracts    
Derivative    
Assets 2 5
Liabilities $ 2 $ 2