Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Parenthetical) (Detail) (Foreign Exchange Contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Foreign Exchange Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Transaction-related costs included in operating expenses	$ 14	$ 31
Gain included in operating expenses	$ 1	$ 2