Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Component of Other Income, Nonoperating [Line Items]
Gains/(Losses) on derivatives	$ 11	$ 575	$ 110
Currency revaluation gains/(losses)	44	(575)	(161)
Interest and investment income	112	85	69
Insurance fee income	0	90	88
Other	83	155	178
Total other income, net	250	330	284
Affiliated Entity [Member]
Component of Other Income, Nonoperating [Line Items]
Related Party Transaction, Interest Income, Notes Receivable, Tax Sharing Agreement	$ 9	$ 5	$ 3