Derivative Instruments and Hedging Activities - Pre-tax Gains (Losses) (Details) - Not designated as a hedge - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative instruments and hedging activities
Total gain (loss)	$ 1	$ (5)	$ 3	$ (7)
Foreign currency exchange contracts | Other, net
Derivative instruments and hedging activities
Total gain (loss)	0	(1)	0	3
Foreign currency forward contracts | Other, net
Derivative instruments and hedging activities
Total gain (loss)	0	0	0	(4)
Metal contracts | Cost of sales
Derivative instruments and hedging activities
Total gain (loss)	2	(3)	4	(5)
Interest Rate Swaps
Derivative instruments and hedging activities
Total gain (loss)	$ (1)	$ (1)	$ (1)	$ (1)