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Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 17, 2018
Jul. 13, 2017
Apr. 18, 2016
Dec. 31, 2020
Jun. 11, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 03, 2015
Jun. 29, 2010
Class of Stock [Line Items]                  
Ordinary shares issuance ADSs       1,200,000   1,200,000      
Share price       $ 9.65          
Share issued due to conversion of convertible preferred shares 70,600                
Convertible preferred stock terms of conversion 1 mandatory convertible preferred share to 16 ADSs, and all of the accumulated and unpaid dividends on the mandatory convertible preferred shares were paid in ADSs, at a ratio of 3.0262                
Number of shares exercisable       28,556          
Number of shares available for future awards       74,000          
Vesting period, description       The vesting period of the outstanding options and RSUs is generally from 1 to 4 years from the date of grant. The vesting period of PSUs is generally 3 years from the date of grant. The rights of the ordinary shares obtained from the exercise of options, RSUs or PSUs are identical to those of the other ordinary shares of the Company. The contractual term of these options is primarily for ten years.          
Company average share price           $ 11.50 $ 20.92    
Total unrecognized compensation cost before tax on employee stock options       $ 20          
Total unrecognized compensation cost before tax on employee stock RSUs       $ 164          
Share based compensation arrangements expected over weighted average period for options       1 year 1 month 6 days          
Share based compensation arrangements expected over weighted average period for RSU/PSUs       2 years 6 months          
2010 Long-Term Equity-Based Incentive Plan [Member]                  
Class of Stock [Line Items]                  
Number of shares exercisable                 70,000
2015 Long-Term Equity-Based Incentive Plan [Member]                  
Class of Stock [Line Items]                  
Number of shares exercisable   142,000 77,000         43,700  
Number of additional shares authorized   65,000 33,300            
2020 Long-Term Equity-Based Incentive Plan [Member]                  
Class of Stock [Line Items]                  
Number of shares exercisable         68,000