Fair Value of Financial Instruments (Details 2) lb in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) lb	Dec. 31, 2017 USD ($)
Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities
Derivatives, notional amount | $	$ 114	$ 89
Foreign Exchange Forward [Member] | Cash Flow Hedges
Derivative Instruments and Hedging Activities
Derivatives, notional amount | $	$ 0	$ 8
Copper [Member]
Financial Assets (Liabilities)
Derivative, Nonmonetary Notional Amount, Mass | lb	10
Zinc [Member]
Financial Assets (Liabilities)
Derivative, Nonmonetary Notional Amount, Mass | lb	4