Derivative Financial Instruments - Fair Value Hedging Information Including Gain Loss Recorded on Derivative (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on the Derivative	$ (20)
Amount of Gain (Loss) Recognized in Income on Hedged Item	17
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	(3)
Interest rate swaps, Fixed rate borrowings, Derivative related income	(2)
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	(17)
Currency swaps, Fixed rate borrowings, Derivative related income	$ 19

Interest rate derivative fair value gain loss.

No definition available.

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- Definition

Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

The net gain (loss) recognized in earnings during the period due to the ineffectiveness on foreign currency fair value hedges.

+ References

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- Definition

The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

+ References

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