Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	$ 6		$ 4
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items]
Interest rate swaps	0	[1]	7	[1]
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	1	[2]	(4)	[2]
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	2	[3]	6	[3]
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	$ 3	[4]	$ (5)	[4]

[1] Recognized, net of tax, as a component of other comprehensive income within stockholders’ equity.

[2] For the three months ended March 31, 2013, included a $2 million gain in operating expenses, and included a $1 million loss in interest expense. For the three months ended March 31, 2012, amounts were included in operating expenses.

[3] Included in operating expense.

[4] Included in interest expense.