Derivative Instruments (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract]
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net	$ 88	$ 15	$ (51)
Foreign currency contracts [Member]
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract]
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net	(44)	(63)	(25)
Cross currency swap contracts [Member]
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract]
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net	132	85	(26)
Forward interest rate contracts [Member]
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract]
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net	$ 0	$ (7)	$ 0