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Financial Instruments - Summary of Notional Amounts of Derivative Contracts (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
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|---|---|
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Interest rate caps [Member]
|
|
| Derivatives, Fair Value [Line Items] | |
| Derivative contracts, notional amounts | $ 2,330 |
|
Foreign currency options [Member]
|
|
| Derivatives, Fair Value [Line Items] | |
| Derivative contracts, notional amounts | 219 |
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Foreign Currency Forwards [Member]
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|
| Derivatives, Fair Value [Line Items] | |
| Derivative contracts, notional amounts | $ 158 |