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Financial Instruments and Risk Management - Fair Value Information on Other Financial Assets and Liabilities Recorded at Amortized Cost (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 1,836 $ 2,250 $ 1,912 $ 1,892
Long-term debt 1,153 1,301    
Carrying Amount [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt 1,153 1,301    
Carrying Amount [Member] | Fair Value, Inputs, Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 1,836 2,250    
Carrying Amount [Member] | Fair Value, Inputs, Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Bank loans (including current portion) 1,153 839    
Senior Bonds    462    
Estimate Fair Value [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt 1,153 1,301    
Estimate Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 1,836 2,250    
Estimate Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Bank loans (including current portion) 1,153 839    
Senior Bonds    $ 462