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Long-Term Debt - Summary of Movement in Deferred Financing Costs (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended |
|---|---|
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Sep. 30, 2013
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| Debt Disclosure [Abstract] | |
| Balance as of January 1 | $ 74 |
| Capitalization of debt finance costs | 29 |
| Amortization | (21) |
| Written-off as loss on extinguishment | (39) |
| Balance as of September 30 | $ 43 |