|
Other Current Assets - Summary of Other Current Assets (Detail) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Prepaid Expense And Other Assets Current [Abstract] | ||
| Restricted cash of subsidiaries | $ 71 | $ 56 |
| Sales and use tax receivables | 46 | 48 |
| Prepaid expenses | 21 | 15 |
| Prepaid incentives | 21 | 18 |
| Assets held for sale | 16 | 16 |
| Derivative assets | 6 | 10 |
| Other | 19 | 7 |
| Other current assets, Total | $ 200 | $ 170 |