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Derivative Financial Instruments - Fair Value Hedging Information Including Gain Loss Recorded on Derivative (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on the Derivative	$ 0	$ (15)
Amount of Gain (Loss) Recognized in Income on Hedged Item	0	9
Fixed rate borrowings [Member] \| Derivative related income (expense) [Member] \| Interest rate swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps, Fixed rate borrowings, Derivative related income	0	(5)
Interest rate swaps, Fixed rate borrowings, Derivative related income	0	0
Fixed rate borrowings [Member] \| Derivative related income (expense) [Member] \| Currency swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Currency swaps, Fixed rate borrowings, Derivative related income	0	(10)
Currency swaps, Fixed rate borrowings, Derivative related income	$ 0	$ 9

Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective.

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