Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Cost-method Investments [Line Items]
Long-term Debt, Current Maturities	$ 338		$ 338		$ 26
Derivatives not designated as hedging instruments	6	$ 14	1	$ 57
Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items]
Derivative, Notional Amount	2,000		2,000
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items]
Interest rate swaps	4	(1)	(4)	(4)
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Interest rate swaps	(3)	(1)	(11)	25
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	5	21	17	37
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	0	(4)	0	0
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	0	(1)	(1)	(1)
Operating Expense [Member]
Schedule of Cost-method Investments [Line Items]
Derivatives not designated as hedging instruments	$ 3	$ 2	$ 26	$ 16