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Share-Based Compensation - Summary of Stock Option Activity and Related Information (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares  
Outstanding at the beginning of the year (in shares) | shares 4,303
Granted (in shares) | shares 963
Exercised (in shares) | shares (1,191)
Forfeited (in shares) | shares (121)
Expired (in shares) | shares (4)
Outstanding at the end of the year (in shares) | shares 3,950
Exercisable at the end of the year (in shares) | shares 2,044
Weighted Average Exercise Price  
Weighted average exercise price, Outstanding at the beginning of the year (in USD per share) | $ / shares $ 62.50
Weighted average exercise price, Granted (in USD per share) | $ / shares 63.37
Weighted average exercise price, Exercised (in USD per share) | $ / shares 53.46
Weighted average exercise price, Forfeited (in USD per share) | $ / shares 71.64
Weighted average exercise price, Expired (in USD per share) | $ / shares 56.75
Weighted average exercise price, Outstanding at the end of the year (in USD per share) | $ / shares 65.16
Weighted average exercise price, Exercisable at the end of the year (in USD per share) | $ / shares $ 60.80
Weighted Average Remaining Contractual Life   
Weighted average remaining contractual life, Outstanding at the end of the year (in years) 6 years
Weighted average remaining contractual life, Exercisable at the end of the year (in years) 4 years 1 month 6 days
Aggregate Intrinsic Value  
Aggregate intrinsic value, Outstanding at the end of the year | $ $ 220.3
Aggregate intrinsic value, Exercisable at the end of the year | $ $ 123.0