Employee Separation / Asset Related Charges, Net (2014 Restructuring Program schedule) (Details) - 2014 Restructuring Program [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		$ 55	$ 78
Restructuring reserve, payments		(23)
Severance and Related Benefit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		53	76
Restructuring reserve, payments		(23)
Other Non-Personnel Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	[1]	2	$ 2
Restructuring reserve, payments	[1]	$ 0

[1] Other non-personnel charges consist of contractual obligation costs.