Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Cumulative Translation Adjustment Summary [Roll Forward]
Beginning Balance	$ (607,000,000)	$ 160,000,000
Net gain/(loss) on Foreign Currency Translation	172,000,000	(483,000,000)
Other Comprehensive Income (Loss), Net of Tax	172,000,000	(482,000,000)
Ending Balance	(435,000,000)	(323,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(435,000,000)	(323,000,000)	$ (607,000,000)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Net gain/(loss) on foreign currency translation, tax adjustment	0	0
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Translation Adjustment Summary [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	$ 172,000,000	$ (483,000,000)