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Employee Benefit Plans (Options Outstanding and Exercisable) (Detail)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted- Average Remaining Contractual Life in Years 9 months 20 days
$ 45.01 - $ 50.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum $ 45.01
Range of Exercise Prices, Maximum 50.00
50.01 - 55.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum 50.01
Range of Exercise Prices, Maximum 55.00
65.01 - 70.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum 65.01
Range of Exercise Prices, Maximum 70.00
70.01 - 75.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum 70.01
Range of Exercise Prices, Maximum 75.00
75.01 - 80.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum 75.01
Range of Exercise Prices, Maximum $ 80.00
Options Outstanding [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Outstanding | shares 2,352,008
Weighted-Average Exercise Price, Options Outstanding $ 63.55
Weighted- Average Remaining Contractual Life in Years 4 years 8 months 16 days
Options Outstanding [Member] | $ 45.01 - $ 50.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Outstanding | shares 260,855
Weighted-Average Exercise Price, Options Outstanding $ 48.00
Weighted- Average Remaining Contractual Life in Years 2 years 11 months 19 days
Options Outstanding [Member] | 50.01 - 55.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Outstanding | shares 676,059
Weighted-Average Exercise Price, Options Outstanding $ 52.98
Weighted- Average Remaining Contractual Life in Years 2 years 7 months 13 days
Options Outstanding [Member] | 65.01 - 70.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Outstanding | shares 608,336
Weighted-Average Exercise Price, Options Outstanding $ 65.11
Weighted- Average Remaining Contractual Life in Years 6 years 8 months 5 days
Options Outstanding [Member] | 70.01 - 75.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Outstanding | shares 287,506
Weighted-Average Exercise Price, Options Outstanding $ 71.38
Weighted- Average Remaining Contractual Life in Years 4 years 11 months 12 days
Options Outstanding [Member] | 75.01 - 80.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Outstanding | shares 519,252
Weighted-Average Exercise Price, Options Outstanding $ 78.95
Weighted- Average Remaining Contractual Life in Years 5 years 10 months 13 days
Options Exercisable [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 2,160,899
Weighted-Average Exercise Price, Options Exercisable $ 63.41
Options Exercisable [Member] | $ 45.01 - $ 50.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 260,855
Weighted-Average Exercise Price, Options Exercisable $ 48.00
Options Exercisable [Member] | 50.01 - 55.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 676,059
Weighted-Average Exercise Price, Options Exercisable $ 52.98
Options Exercisable [Member] | 65.01 - 70.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 417,227
Weighted-Average Exercise Price, Options Exercisable $ 65.11
Options Exercisable [Member] | 70.01 - 75.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 287,506
Weighted-Average Exercise Price, Options Exercisable $ 71.38
Options Exercisable [Member] | 75.01 - 80.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 519,252
Weighted-Average Exercise Price, Options Exercisable $ 78.95