Interest and Other Expense (Income), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Interest income	$ (65)	$ (24)	$ (10)
Interest expense from debt and amortization of debt discount and deferred financing costs	140	162	217
Other expense (income), net	(4)	8	7
Interest and other expense (income), net	$ 71	$ 146	$ 214