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Employee Benefit Plans (Options Outstanding and Exercisable) (Detail)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted- Average Remaining Contractual Life in Years 1 year 4 months 17 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 2,917,142
Weighted-Average Exercise Price, Options Outstanding $ 63.34
Weighted- Average Remaining Contractual Life in Years 5 years 3 months 26 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 294,230
Weighted-Average Exercise Price, Options Outstanding $ 48.00
Weighted- Average Remaining Contractual Life in Years 3 years 9 months 26 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 915,923
Weighted-Average Exercise Price, Options Outstanding $ 52.79
Weighted- Average Remaining Contractual Life in Years 3 years 15 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 711,477
Weighted-Average Exercise Price, Options Outstanding $ 65.11
Weighted- Average Remaining Contractual Life in Years 7 years 5 months 27 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 345,195
Weighted-Average Exercise Price, Options Outstanding $ 71.39
Weighted- Average Remaining Contractual Life in Years 5 years 9 months 11 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 650,317
Weighted-Average Exercise Price, Options Outstanding $ 78.94
Weighted- Average Remaining Contractual Life in Years 6 years 6 months 29 days
Options Exercisable [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 2,294,986
Weighted-Average Exercise Price, Options Exercisable $ 61.63
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 294,230
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 915,923
Weighted-Average Exercise Price, Options Exercisable $ 52.79
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 294,507
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 345,195
Weighted-Average Exercise Price, Options Exercisable $ 71.39
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 445,131
Weighted-Average Exercise Price, Options Exercisable $ 78.94