Restructuring Charges (By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 275	$ 173	$ 201
Operating Segments | North America
Restructuring Cost and Reserve [Line Items]
Restructuring costs	28
Operating Segments | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring costs	190
Operating Segments | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring costs	20
Operating Segments | Asia
Restructuring Cost and Reserve [Line Items]
Restructuring costs	16
Corporate / Other | Corporate / Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 21