Interest and other income/(expense), net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Nonoperating Income (Expense) [Abstract]
Interest expense	$ (23)	$ (23)	$ (56)
Interest income	52	27	19
Foreign currency exchange losses, net	(66)	(87)	(14)
Other	6	(1)	1
Interest and other income/(expense), net	$ (31)	$ (84)	$ (50)