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Stock-based Compensation Plans - Options Outstanding and Option Exercisable (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding | shares 48,272
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 4 years 9 months 18 days
Options Outstanding, Weighted- Average Exercise Price $ 70.37
Options Exercisable | shares 33,163
Options Exercisable, Weighted-Average Exercise Price $ 79.70
Exercise prices range $38.75 - $69.98  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise prices minimum range 38.75
Exercise prices maximum range $ 69.98
Options Outstanding | shares 15,562
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 7 years 8 months 12 days
Options Outstanding, Weighted- Average Exercise Price $ 44.48
Options Exercisable | shares 3,846
Options Exercisable, Weighted-Average Exercise Price $ 56.69
Exercise prices range $70.31 - $76.74  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise prices minimum range 70.31
Exercise prices maximum range $ 76.74
Options Outstanding | shares 9,462
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 2 years 1 month 6 days
Options Outstanding, Weighted- Average Exercise Price $ 72.10
Options Exercisable | shares 9,399
Options Exercisable, Weighted-Average Exercise Price $ 72.06
Exercise prices range $77.10 - $83.15  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise prices minimum range 77.10
Exercise prices maximum range $ 83.15
Options Outstanding | shares 7,303
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 5 years 4 months 24 days
Options Outstanding, Weighted- Average Exercise Price $ 79.29
Options Exercisable | shares 5,425
Options Exercisable, Weighted-Average Exercise Price $ 79.52
Exercise prices range $83.89 - $88.77  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise prices minimum range 83.89
Exercise prices maximum range $ 88.77
Options Outstanding | shares 8,549
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 3 years
Options Outstanding, Weighted- Average Exercise Price $ 85.96
Options Exercisable | shares 7,097
Options Exercisable, Weighted-Average Exercise Price $ 85.66
Exercise prices range $90.00 - $114.83  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise prices minimum range 90.00
Exercise prices maximum range $ 114.83
Options Outstanding | shares 7,396
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 3 years 4 months 24 days
Options Outstanding, Weighted- Average Exercise Price $ 95.79
Options Exercisable | shares 7,396
Options Exercisable, Weighted-Average Exercise Price $ 95.79