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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 |  |

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