DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Commodity Derivative Activity in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on derivatives at beginning of period, After tax			$ 113	$ (19)
Realized amounts reclassified into earnings, After tax			(151)	32
Net change in derivative fair value, After tax	(41)	275	71	181
Ineffectiveness reclassified into earnings, After tax		(9)		(10)
Unrealized gain on derivatives at end of period, After tax	33	184	33	184
Unrealized gain (loss) on derivatives at beginning of period, Before tax			145	(54)
Realized amounts reclassified into earnings, Before tax			(202)	36
Net change in derivative fair value, Before tax			97	304
Ineffectiveness reclassified into earnings, Before tax			(1)	(16)
Unrealized gain on derivatives at end of period, Before tax	$ 39	$ 270	$ 39	$ 270