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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
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents $ 1,771 $ 2,017 $ 1,836 $ 2,250
Carrying Amount [Member] | Senior Unsecured Convertible Bonds [Member]        
Long-term debt        
Senior unsecured convertible bonds   884    
Carrying Amount [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 1,099 1,271    
Carrying Amount [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Convertible Bonds [Member]        
Long-term debt        
Senior unsecured convertible bonds 904 888    
Carrying Amount [Member] | Fair Value, Inputs, Level 2 [Member]        
Long-term debt        
Bank loans (including current portion) 708 917    
Estimate Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 1,099 1,271    
Estimate Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Convertible Bonds [Member]        
Long-term debt        
Senior unsecured convertible bonds 960 967    
Estimate Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]        
Long-term debt        
Bank loans (including current portion) $ 708 $ 917