FINANCIAL INSTRUMENTS (Unrealized gains losses) (Details) (Commodity Contract [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Embedded derivatives in provisional sales contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Atlantic Copper [Member] | Amounts recorded in Sales [Member]
Realized gains (losses):
Realized and unrealized gains (losses)	$ 77	[1]	$ (519)	[1]	$ 619	[1]
Embedded derivatives in provisional purchase contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Atlantic Copper [Member] | Amounts recorded in Sales [Member]
Realized gains (losses):
Realized and unrealized gains (losses)	0	[2]	0	[2]	(2)	[2]
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Atlantic Copper [Member] | Amounts recorded in Cost of Sales [Member]
Realized gains (losses):
Realized and unrealized gains (losses)	15	[2]	(2)	[2]	(30)	[2]
Fair Value Hedging [Member] | Amounts recorded in Sales [Member]
Unrealized gains (losses):
Derivative financial instruments	15		(28)		7
Hedged item	(15)		28		(7)
Realized gains (losses):
Matured derivative financial instruments	$ (2)		$ (28)		$ 37

[1] Amounts recorded in revenues.

[2] Amounts recorded in cost of sales as production and delivery costs.