DERIVATIVE FINANCIAL INSTRUMENTS INCOME STMT (DETAIL) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Designated as Hedging Instrument [Member] | Natural Gas Contract [Member] | Cost Of Sales Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Reclassified From Accumulated OCI Into Income Effective Portion	$ 0	$ 2	$ 2	$ 6
Designated as Hedging Instrument [Member] | Interest Rate Swap Member | Interest Expense Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing	1	2	0	5
Nondesignated [Member] | Natural Gas Contract [Member] | Other Expense Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Recognized In Income Net	0	0	1	(2)
Nondesignated [Member] | Foreign Exchange Contract Member | Other Expense Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Recognized In Income Net	(1)	(1)	0	3
Nondesignated [Member] | Energy Supply Contract [Member] | Other Expense Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Recognized In Income	$ 0	$ 0	$ 0	$ 1