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Interest Expense, Net - Additional Information (Detail) (Floating Rate Notes [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Floating Rate Notes [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Interest income (expense), net | $ 2 | $ 6 | $ 3

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