|
Financial Instruments - Summary of Notional Amounts of Derivative Contracts (Detail) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2013
|
|---|---|
|
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 | 215 |
|
Foreign currency forwards [Member]
|
|
| Derivatives, Fair Value [Line Items] | |
| Derivative contracts, notional amounts | $ 195 |