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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Derivatives, Fair Value [Line Items] |
|
|
|
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| Net asset position related to derivative financial instruments |
$ 10 |
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|
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| Credit risk fair value adjustments |
15.00% |
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|
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| Proceeds from settlement of foreign currency derivative contracts |
4 |
9 |
34 |
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| Probability of default percentage |
2.00% |
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|
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| Credit default recovery rate percentage |
20.00% |
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|
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| Change in unobservable inputs percentage |
10.00% |
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|
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| Loss for the period included in other comprehensive income (loss) |
4 |
|
|
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| Total loss of derivative contracts |
|
|
|
9 |
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Maximum [Member]
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| Derivatives, Fair Value [Line Items] |
|
|
|
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| Transactions period of derivative contracts |
1 year |
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Interest rate caps [Member]
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| Derivatives, Fair Value [Line Items] |
|
|
|
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| Loss for the period included in other comprehensive income (loss) |
(4) |
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Foreign Currency Contracts [Member]
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| Derivatives, Fair Value [Line Items] |
|
|
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| Loss for the period included in other comprehensive income (loss) |
0 |
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Interest rate caps [Member] | Maximum [Member]
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| Derivatives, Fair Value [Line Items] |
|
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| Transactions period of derivative contracts |
3 years |
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Foreign Exchange Contracts [Member]
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| Derivatives, Fair Value [Line Items] |
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| Payments to settle foreign currency forward contracts |
7 |
51 |
|
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| Proceeds from settlement of foreign currency derivative contracts |
|
$ 9 |
$ 34 |
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USLIBOR Interest Rate Base [Member]
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| Derivatives, Fair Value [Line Items] |
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| Interest rate cap on derivative contracts |
1.50% |
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