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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 |  |  |  |

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