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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, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 1,759	$ 1,629	$ 1,771	$ 2,017
Carrying Amount [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,303	960
Carrying Amount [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Convertible Bonds [Member]
Long-term debt
Senior unsecured convertible bonds	1,278	926
Carrying Amount [Member] | Fair Value, Inputs, Level 2 [Member]
Long-term debt
Bank loans (including current portion)	423	525
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	1,303	960
Estimate Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Convertible Bonds [Member]
Long-term debt
Senior unsecured convertible bonds	1,860	1,127
Estimate Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
Long-term debt
Bank loans (including current portion)	$ 423	$ 525

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

+ References

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