Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Cumulative Translation Adjustment Summary [Roll Forward]
Beginning Balance	$ (323,000,000)	$ 635,000,000	$ 160,000,000	$ 717,000,000
Net gain/(loss) on Foreign Currency Translation	196,000,000	85,000,000	(287,000,000)	3,000,000
Other Comprehensive Income (Loss), Net of Tax	196,000,000	85,000,000	(286,000,000)	3,000,000
Ending Balance	(127,000,000)	720,000,000	(127,000,000)	720,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(127,000,000)	720,000,000	(127,000,000)	720,000,000	$ 160,000,000
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Net gain/(loss) on foreign currency translation, tax adjustment	0	0	0	0
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Translation Adjustment Summary [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	$ 196,000,000	$ 85,000,000	$ (287,000,000)	$ 3,000,000