Fair Value of Financial Instruments (Unaudited) (Details 2) lb in Millions, $ in Millions	6 Months Ended
	Jun. 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	17
Zinc [Member] [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	6
Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Notional Amount | $	$ 114	$ 89
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Notional Amount | $	$ 4	$ 8