Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Gains/(Losses) on derivatives	$ (60)	$ (36)	$ (182)	$ (15)
Currency revaluation gains/(losses)	36	51	80	73
Interest and investment income	49	33	140	80
Other	11	9	36	35
Total other income, net	$ 36	$ 57	$ 74	$ 173