Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	$ (15)	[1]	$ (4)	[1]	$ 28	[1]	$ 2	[1]
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items]
Interest rate swaps	0	[2]	0	[2]	1	[2]	11	[2]
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	(13)	[3]	(2)	[3]	22	[3]	0	[3]
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	0	[4]	3	[4]	0	[4]	4	[4]
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	(2)	[5]	(5)	[5]	5	[5]	(13)	[5]
Interest Expense [Member] | Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	16				13
Operating Expense [Member] | Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivative Instruments Gain Loss Recognized In Operations	$ 3				$ 9

[1] Gains (losses) related to derivative instruments are expected to be largely offset by (losses) gains on the underlying exposures being hedged.

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

[3] For the three months ended September 30, 2013, included a $16 million loss in interest expense and a $3 million gain in operating expenses. For the nine months ended September 30, 2013, included a $13 million gain in interest expense and a $9 million gain in operating expenses. For the three and nine months ended September 30, 2012, amounts were included in operating expenses.

[4] Included in operating expense.

[5] Included in interest expense.