Asset Impairment and Exit Costs (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Cash payments related to exit costs	$ 31	$ 232	$ 360
Restructuring Reserve	19	54	270
Asset impairment and exit costs	$ 0	68	535
Total separation programs		68	391
European Union [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		68	351
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax asset impairment charges		0	144
Facility Closing [Member] | European Union [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax asset impairment charges		0	139
Facility Closing [Member] | Canada [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax asset impairment charges			5
Facility Closing [Member] | Affiliated Entity [Member] | European Union [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			489
Pre-tax asset impairment charges			139
Employee Severance [Member] | Affiliated Entity [Member] | European Union [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs			343
Contract Termination [Member] | Affiliated Entity [Member] | European Union [Member]
Restructuring Cost and Reserve [Line Items]
Other separation costs			7
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		$ 68	$ 41