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Change in the Fair Value for Interest Rate Contracts and the Related Hedged Items (Detail) (Fair Value Hedging, Interest Rate Contract, Interest Expense Long Term Debt [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Fair Value Hedging \| Interest Rate Contract \| Interest Expense Long Term Debt [Member]
Derivatives, Fair Value [Line Items]
Change in fair value of interest rate swaps hedging long-term debt	$ (100)	$ (66)
Change in fair value of hedged long-term debt	$ 92	$ 65

Amount of unrealized gain (loss) included in earnings for the period related to the fair value of the hedged item in an interest rate fair value hedge, which was offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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