Goodwill and Other Intangible Assets, net (Goodwill and Other Intangible Assets, net, by Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 7,666	$ 7,324	$ 7,415
Other Intangible Assets, net	2,432	2,470
European Union [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	1,419	1,238	1,310
Other Intangible Assets, net	458	479
Eastern Europe, Middle East & Africa [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	423	372	374
Other Intangible Assets, net	194	200
Asia [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	3,577	3,596	3,581
Other Intangible Assets, net	1,048	1,074
Latin America & Canada [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	2,247	2,118	$ 2,150
Other Intangible Assets, net	$ 732	$ 717