Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Expense
Interest expense	$ 689	$ 251	$ 1,212	$ 509
Interest income	(214)	(4)	(264)	(10)
Interest expense), net	$ 475	$ 247	$ 948	$ 499