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Derivative Financial Instruments (Schedule Of Derivative Instruments, Gains/(Losses) In Statement Of Financial Performance) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
Effective portion recognized in other comprehensive loss, net of taxes $ (8) $ (140) $ (137)
Effective portion reclassified out of Accumulated other comprehensive loss into earnings, net of taxes (78) (79) $ (7)
Foreign Exchange Contracts [Member]      
Derivative [Line Items]      
Effective portion recognized in other comprehensive loss, net of taxes (9) (136)  
Effective portion reclassified out of Accumulated other comprehensive loss into earnings, net of taxes (70) (67)  
Forward points recognized in Other income, net 13 12  
Undesignated derivatives recognized in Other income, net: (2) (1)  
Commodity Contracts [Member]      
Derivative [Line Items]      
Effective portion recognized in other comprehensive loss, net of taxes 1 (4)  
Effective portion reclassified out of Accumulated other comprehensive loss into earnings, net of taxes $ (8) $ (12)