DERIVATIVE FINANCIAL INSTRUMENTS INCOME STMT (DETAIL) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Cost Of Sales Member | Designated as Hedging Instrument [Member] | Natural Gas Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Reclassified From Accumulated OCI Into Income Effective Portion	$ 5	$ 1	$ 7	$ 2
Interest Expense Member | Designated as Hedging Instrument [Member] | Interest Rate Swap Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Recognized In Income	0	1	0	(1)
Other Expense Member | Nondesignated [Member] | Natural Gas Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing	(1)	0	(2)	(1)
Other Expense Member | Nondesignated [Member] | Foreign Exchange Contract Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Recognized In Income Net	2	(1)	3	(1)
Other Expense Member | Nondesignated [Member] | Energy Supply Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Recognized In Income	$ 0	$ 1	$ 0	$ 0