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Interest Expense, Net - Interest Expense, Net Consisted (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Income $ 41 $ 21 $ 31
Expense (76) (46) (34)
Total $ (35) $ (25) $ (3)