Goodwill and Other Intangible Assets, net (Movement in Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning Balance	$ 7,324	$ 7,415
Changes due to:
Currency	342	(91)
Ending Balance	7,666	7,324
European Union [Member]
Goodwill [Roll Forward]
Beginning Balance	1,238	1,310
Changes due to:
Currency	181	(72)
Ending Balance	1,419	1,238
Eastern Europe, Middle East & Africa [Member]
Goodwill [Roll Forward]
Beginning Balance	372	374
Changes due to:
Currency	51	(2)
Ending Balance	423	372
Asia [Member]
Goodwill [Roll Forward]
Beginning Balance	3,596	3,581
Changes due to:
Currency	(19)	15
Ending Balance	3,577	3,596
Latin America & Canada [Member]
Goodwill [Roll Forward]
Beginning Balance	2,118	2,150
Changes due to:
Currency	129	(32)
Ending Balance	$ 2,247	$ 2,118