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Employee Benefit Plans (Options Outstanding and Exercisable) (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted- Average Remaining Contractual Life in Years 2 years 1 month 6 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 4,089,028
Weighted-Average Exercise Price, Options Outstanding $ 62.67
Weighted- Average Remaining Contractual Life in Years 5 years 10 months 28 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 469,015
Weighted-Average Exercise Price, Options Outstanding $ 48.19
Weighted- Average Remaining Contractual Life in Years 3 years 11 months 5 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 1,385,938
Weighted-Average Exercise Price, Options Outstanding $ 52.76
Weighted- Average Remaining Contractual Life in Years 3 years 10 months 20 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 860,190
Weighted-Average Exercise Price, Options Outstanding $ 65.11
Weighted- Average Remaining Contractual Life in Years 8 years 4 months 10 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 518,010
Weighted-Average Exercise Price, Options Outstanding $ 71.38
Weighted- Average Remaining Contractual Life in Years 6 years 6 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 855,875
Weighted-Average Exercise Price, Options Outstanding $ 78.94
Weighted- Average Remaining Contractual Life in Years 7 years 5 months 1 day
Options Exercisable [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Options Exercisable | shares 2,855,663
Weighted-Average Exercise Price, Options Exercisable $ 59.21
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 469,015
Weighted-Average Exercise Price, Options Exercisable $ 48.19
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 1,385,938
Weighted-Average Exercise Price, Options Exercisable $ 52.76
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 200,611
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 379,849
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 420,250
Weighted-Average Exercise Price, Options Exercisable $ 78.94