Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Gains/(Losses) on derivatives	$ (87)	$ 32
Currency revaluation gains/(losses)	62	(34)
Interest and investment income	42	23
Other	20	9
Total other income, net	$ 37	$ 30