Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	$ 37	[1]	$ 2	[1]	$ 43	[1]	$ 6	[1]
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items]
Interest rate swaps	1	[2]	4	[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	34	[3]	6	[3]	35	[3]	2	[3]
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	(2)	[4]	(5)	[4]	0	[4]	1	[4]
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	4	[5]	(3)	[5]	7	[5]	(8)	[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	30				29
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	$ 4				$ 6

[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 June 30, 2013, included a $30 million gain in interest expense and a $4 million gain in operating expenses. For the six months ended June 30, 2013, included a $29 million gain in interest expense and a $6 million gain in operating expenses. For the three and six months ended June 30, 2012, amounts were included in operating expenses.

[4] Included in operating expense.

[5] Included in interest expense.