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Financial Instruments (Hedging Activity Reported in Accumulated Other Comprehensive Earnings (Losses) Net of Income Taxes) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]      
Gain at beginning of period $ 92 $ 15  
Derivative (gains)/losses transferred to earnings (235) (22) 18
Amount of Gain/(Loss) Recognized in Other Comprehensive Earnings on Derivative 206 99 (5)
(Loss)/gain at end of period 63 92 15
Foreign Exchange Contract [Member] | Other Comprehensive Income (Loss) [Member]
     
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]      
Gain at beginning of period 92 15 2
Derivative (gains)/losses transferred to earnings (235) (22) 18
Amount of Gain/(Loss) Recognized in Other Comprehensive Earnings on Derivative 206 99 (5)
(Loss)/gain at end of period $ 63 $ 92 $ 15