Interest and Other Expense (Income), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income and Expenses [Abstract]
Interest income	$ (19)	$ (18)	$ (41)	$ (32)
Interest expense from debt and amortization of debt discount and deferred financing costs	23	43	46	84
Unrealized gain on equity investment	(38)	0	(38)	0
Other expense (income), net	0	1	2	2
Interest and other expense (income), net	$ (34)	$ 26	$ (31)	$ 54