Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest Expense
Interest expense	$ 674	$ 250	$ 1,886	$ 759
Interest income	(221)	(5)	(485)	(15)
Interest expense), net	$ 453	$ 245	$ 1,401	$ 744