Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Jun. 29, 2012
Balance as of December 31, 2011	$ 38	$ 54
Loss Recognized in AOCI, After-Tax	(2)
Gain (Loss) Recognized in AOCI	(3)	26
Less: Gain Reclassified into Income	(15)	(42)
Balance as of September 30, 2012	20
Balance as of December 31, 2011	21	31
Gain Recognized in AOCI, After-Tax		15
Less: Gain Reclassified into Income, After-Tax	(8)	(25)
Balance as of September 30, 2012	$ 11