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Stock-Based Compensation - Schedule of Options Outstanding (Detail) shares in Millions, Unit_pure in Millions | 12 Months Ended
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Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares
Disclosure of terms and conditions of share-based payment arrangement [abstract] |  |
Number of options, Beginning balance | 21 | 23
Number of options, Granted | 5 | 3
Number of options, Exercised | (2) | (4)
Number of options' Expired | 0 | 0
Number of options' Forfeited | 0 | (1)
Number of options, Ending balance | shares | 24 | 21
Number of options, Exercisable, Ending balance | 6 | 5
Weighted average exercise price, Beginning balance | $ 20.91 | $ 20.29
Weighted average exercise price, Granted | 24.38 | 22.62
Weighted average exercise price, Exercised | 18.17 | 18.79
Weighted average exercise price, Expired | 24.27 | 18.88
Weighted average exercise price, Forfeited | 23.73 | 23.41
Weighted average exercise price, Ending balance | 21.74 | 20.91
Weighted average exercise price, Exercisable, Ending balance | $ 19.52 | $ 17.56

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