Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Derivatives, Fair Value [Line Items]
Net asset position related to derivative financial instruments	$ 15
Probability of default percentage	3.00%
Credit default recovery rate percentage	20.00%
Change in unobservable inputs percentage	10.00%
Uslibor [Member]
Derivatives, Fair Value [Line Items]
Interest rate cap on derivative contracts	1.50%
Maximum [Member]
Derivatives, Fair Value [Line Items]
Transactions period of derivative contracts	1 year
Minimum [Member]
Derivatives, Fair Value [Line Items]
Credit valuation adjustment applied to arrive at the fair value of derivatives	15.00%
Foreign currency derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Payments to settle foreign currency forward contracts	$ 7
Interest rate caps [Member] \| Maximum [Member]
Derivatives, Fair Value [Line Items]
Transactions period of derivative contracts	4 years

Credit Valuation Adjustment Applied To Arrive At Fair Value Of Derivatives Percentage

No definition available.

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- Definition

Derivative settlement amount.

+ References

No definition available.

+ Details

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- Definition

Recovery rate applied for the credit default swap adjustment.

+ References

No definition available.

+ Details

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- Definition

Percentage of change in significant unobservable inputs.

+ References

No definition available.

+ Details

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- Definition

Transactions period of derivative contracts.

+ References

No definition available.

+ Details

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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- Definition

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313

+ Details

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- Details

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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