Fair Value of Financial Instruments (Unaudited) (Details 2) lb in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) lb	Dec. 31, 2017 USD ($)
Copper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	13
Zinc [Member] [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	4
Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Notional Amount | $	$ 117	$ 89
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Notional Amount | $	$ 2	$ 8