Derivative Instruments and Hedging Activities - Pre-tax Gains (Losses) (Details) - Not designated as a hedge - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative instruments and hedging activities
Total gain (loss)	$ 2	$ (2)
Foreign currency exchange contracts | Other, net
Derivative instruments and hedging activities
Total gain (loss)	0	4
Foreign currency forward contracts | Other, net
Derivative instruments and hedging activities
Total gain (loss)	0	(4)
Metal contracts | Cost of sales
Derivative instruments and hedging activities
Total gain (loss)	$ 2	$ (2)