Interest and other income (expense), net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Nonoperating Income (Expense) [Abstract]
Interest income	$ 661	$ 398	$ 176
Interest expense	(9)	(6)	(10)
Foreign currency exchange losses, net	(213)	(6)	(76)
Other	9	5	1
Interest and other income (expense), net	$ 448	$ 391	$ 91