Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Gains/(Losses) on derivatives	$ (35)	$ (10)	$ (122)	$ 22
Currency revaluation gains/(losses)	(18)	56	44	22
Interest and investment income	49	24	91	47
Other	5	16	25	25
Total other income, net	$ 1	$ 86	$ 38	$ 116