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Financial Instruments - Carrying Amounts and Estimated Fair Values of Company's Long-Term Debt and Foreign Currency Forward Contracts (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Assets And Liabilities Carrying Value And Fair Value [Line Items]    
Senior Notes, Carrying Amount $ 2,941 $ 2,940
CODES, Carrying Amount 689 689
Senior Notes, Estimated Fair Value 3,121 3,301
CODES, Estimated Fair Value 830 697
Estimated Fair Value [Member]
   
Assets And Liabilities Carrying Value And Fair Value [Line Items]    
Foreign currency forward contracts 1 5
Carrying Amount [Member]
   
Assets And Liabilities Carrying Value And Fair Value [Line Items]    
Foreign currency forward contracts $ 1 $ 5