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Interest Expense, Net - Interest Expense, Net Consisted (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments Debt And Equity Securities [Abstract]      
Income $ 18 $ 41 $ 21
Expense (23) (76) (46)
Total $ (5) $ (35) $ (25)