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Employee Benefit Plans (Options Outstanding and Exercisable) (Detail) | 12 Months Ended
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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

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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