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Stock-Based Compensation - Schedule of Options Outstanding (Detail)
shares in Millions
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]    
Number of options, Beginning balance 24,000,000 21,000,000
Number of options, Granted 0 5,000,000
Number of options, Exercised (3,000,000) (2,000,000)
Number of options' Forfeited   0
Number of options, Ending balance | shares 21 24
Number of options, Exercisable, Ending balance 8,000,000 6,000,000
Weighted average exercise price, Beginning balance $ 21.74 $ 20.91
Weighted average exercise price, Granted   24.38
Weighted average exercise price, Exercised 18.34 18.17
Weighted average exercise price, Expired 24.73 24.27
Weighted average exercise price, Forfeited 23.96 23.73
Weighted average exercise price, Ending balance 22.09 21.74
Weighted average exercise price, Exercisable, Ending balance $ 18.94 $ 19.52