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Long-Term Debt - Long-Term Debt Denominated by Currencies (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 1,153 $ 1,301
U.S. dollar [Member]
   
Debt Instrument [Line Items]    
Long-term debt 1,012 689
Euro [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 141 $ 612