Derivative Instruments and Hedging Activities - Pre-tax Gains (Losses) (Details) - Not designated as a hedge - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative instruments and hedging activities
Total gain (loss)	$ 1	$ (8)	$ 4	$ (15)
Foreign currency exchange contracts | Other, net
Derivative instruments and hedging activities
Total gain (loss)	0	0	0	3
Foreign currency forward contracts | Other, net
Derivative instruments and hedging activities
Total gain (loss)	0	1	0	(3)
Metal contracts | Cost of sales
Derivative instruments and hedging activities
Total gain (loss)	1	(9)	5	(14)
Interest Rate Swaps
Derivative instruments and hedging activities
Total gain (loss)	$ 0	$ 0	$ (1)	$ (1)