Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 2,224	$ 3,007	$ 1,373
Other comprehensive income/(loss), net of tax
Foreign currency translation	(410)	471	(283)
Other comprehensive income/(loss), net of tax	(410)	471	(283)
Comprehensive Income (Loss)	$ 1,814	$ 3,478	$ 1,090