Derivatives (Details 1) (Foreign Currency Exchange Contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Foreign Currency Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency exchange contracts, Effective Portion Reclassified from AOCI to Earnings	$ 24	$ 0	$ 45	$ (13)
Foreign currency exchange contracts, Effective Portion Recognized in Other Comprehensive Income	$ 54	$ (40)	$ 141	$ 83