Restructuring Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Restructuring and Related Cost [Abstract]
Restructuring costs total	$ 89	$ 81	$ 214	$ 344	$ 441
Employee separation costs	60	46	180	295	382
Long-lived asset impairments and other restructuring costs	29	35	34	49
Long-lived asset impairments					33
Other restructuring costs					26
Estimated cash separation costs	800		800
Employee Separation Charges [Roll Forward]
Liability balance at beginning of period			182	89	89
Increase in liability (separation charges)	60	$ 46	180	$ 295	382
Reduction in liability (payments and other adjustments)			(197)		(289)
Liability balance at end of period	165		165		182
Gosselies, Belgium facility
Restructuring and Related Cost [Abstract]
Employee separation costs	0		24		273
Employee Separation Charges [Roll Forward]
Increase in liability (separation charges)	0		24		$ 273
Liability balance at end of period	49		49
Special termination benefits
Restructuring and Related Cost [Abstract]
Estimated cash separation costs	$ 400		$ 400