Financial Instruments (Effect Of Interest Rate And Cross Currency Swaps On Results Of Operations) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, Net of Tax	$ 126
Cross Currency Swap (Other Assets) [Member] | Other Operating Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Operations on Derivatives	6
Interest Rate Swap (Income Taxes And Other Liabilities) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, Net of Tax	100
Interest Rate Swap (Income Taxes And Other Liabilities) [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Operations	$ 90