Derivatives (Details 1) (Foreign Currency Exchange Contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Foreign Currency Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency exchange contracts, Effective Portion Reclassified from AOCI to Earnings	$ 55	$ (8)	$ 100	$ (21)
Foreign currency exchange contracts, Effective Portion Recognized in Other Comprehensive Income	$ (70)	$ (27)	$ 70	$ 56