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Stock-Based Compensation - Schedule of Range of Exercise Prices of Outstanding Share Options (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |  |
Number of options, Options outstanding | 24,000,000 | 21,000,000 | 23,000,000
Weighted average exercise price, Options outstanding | $ 21.74 | $ 20.91 | $ 20.29
Weighted average remaining contractual life (in years) | 6 years 21 days |  |
Number of options, Options exercisable | 6,000,000 | 5,000,000 |
Weighted average exercise price, Options exercisable | $ 19.52 | $ 17.56 |
Weighted average remaining contractual life (in years), Options exercisable | 2.84 |  |
$12.64 - $20.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |  |
Number of options, Options outstanding | 6,000,000 |  |
Weighted average exercise price, Options outstanding | $ 16.77 |  |
Weighted average remaining contractual life (in years) | 3 years 9 months |  |
Number of options, Options exercisable | 2,000,000 |  |
Weighted average exercise price, Options exercisable | $ 15.32 |  |
Weighted average remaining contractual life (in years), Options exercisable | 1.27 |  |
$21.00 - $24.83 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |  |
Number of options, Options outstanding | 18,000,000 |  |
Weighted average exercise price, Options outstanding | $ 23.53 |  |
Weighted average remaining contractual life (in years) | 6 years 10 months 24 days |  |
Number of options, Options exercisable | 4,000,000 |  |
Weighted average exercise price, Options exercisable | $ 21.85 |  |
Weighted average remaining contractual life (in years), Options exercisable | 3.72 |  |

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