EMPLOYEE BENEFITS (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 USD ($) years	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Atlantic Copper [Member] USD ($) years	Dec. 31, 2011 Atlantic Copper [Member] EUR (€)
Employee Benefits [Line Items]
Estimated future average expected rate of return per annum on pension assets (in hundredths)	7.50%
Number of years over which estimated future average expected rate of return per annum is calculated (in years)	10
Estimated future average expected rate of return on passively managed pension assets (in hundredths)	7.00%
Estimated future average expected premium on actively managed pension assets (in hundredths)	0.50%
Annual funding for contractual obligation to Atlantic Copper retirees (in millions of euros)					€ 7.2
Annual funding for contractual obligation to Atlantic Copper retirees (in millions of dollars)				9
Exchange Rate Of Dollars To Euros				1.29
Number of years for funding of contractual obligation to Atlantic Copper retirees (in years)				15	15
Total contractual obligation to Atlantic Copper retirees (in millions of euros)					72
Accumulated benefit obligations in excess of plan assets [Abstract]
Projected benefit obligation	2,055	1,662
Accumulated benefit obligation	1,874	1,581
Fair value of plan assets	1,261	1,122
Current company match for employee savings plan (in hundredths)	4.00%
Company match for employee savings plan for certain long-term employees (in hundredths)	10.00%
Balance of unfunded defined contribution plan	56	49
Costs charged to operations for employee savings plans and defined contribution plans	$ 35	$ 36	$ 30