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Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 17, 2018
Jul. 13, 2017
Apr. 18, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 03, 2015
Jun. 29, 2010
Class of Stock [Line Items]                  
Ordinary shares issuance ADSs 1,200,000,000       1,200,000,000 1,200,000,000      
Share price         $ 9.8        
Share issued due to conversion of convertible preferred shares 70,600,000 70,600,000              
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         26,601,000        
Number of shares available for future awards         62,700,000        
Vesting period, description         The vesting period of the outstanding options, RSUs and PSUs is generally from 1 to 4 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 seven years in prior plans and ten years for options granted under the 2010 and 2015 plans described above.        
Company average share price $ 20.92       $ 11.50 $ 20.92 $ 25.62    
Total unrecognized compensation cost before tax on employee stock options         $ 53        
Total unrecognized compensation cost before tax on employee stock RSUs         $ 159        
Share based compensation arrangements expected over weighted average period for options         1 year 10 months 24 days        
Share based compensation arrangements expected over weighted average period for RSU/PSUs         2 years 8 months 12 days        
Dividends declared and paid         $ 0 0 0.85    
Dividend mandatory convertible preferred shares $ 0       $ 0 $ 0 $ 70,000,000    
2010 Long-Term Equity-Based Incentive Plan [Member]                  
Class of Stock [Line Items]                  
Number of shares exercisable                 70,000,000
2015 Long-Term Equity-Based Incentive Plan [Member]                  
Class of Stock [Line Items]                  
Number of shares exercisable     142,000,000 77,000,000       43,700,000  
Number of additional shares authorized     65,000,000 33,300,000