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Common Stock - Summary of Stock Option Outstanding Information (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-Avg Remaining Contractual Life | 6 years 7 months 28 days
Stock Options Outstanding, Shares | shares | 22,472,047
Stock Options Outstanding, Weighted - Average Exercise Price | $ 48.99
Stock Options Exercisable, Shares | shares | 14,309,944
Stock Options Exercisable, Weighted - Average Exercise Price | $ 55.00
Stock option, Minimum Range | 23.94
Stock option, Maximum Range | $ 77.99
Range One [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted-Avg Remaining Contractual Life | 7 years 6 months 18 days
Stock Options Outstanding, Shares | shares | 15,797,683
Stock Options Outstanding, Weighted - Average Exercise Price | $ 40.25
Stock Options Exercisable, Shares | shares | 7,635,580
Stock Options Exercisable, Weighted - Average Exercise Price | $ 42.19
Stock option, Minimum Range | 23.94
Stock option, Maximum Range | $ 55.00
Range Two [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted-Avg Remaining Contractual Life | 5 years 1 month 2 days
Stock Options Outstanding, Shares | shares | 4,301,953
Stock Options Outstanding, Weighted - Average Exercise Price | $ 66.20
Stock Options Exercisable, Shares | shares | 4,301,953
Stock Options Exercisable, Weighted - Average Exercise Price | $ 66.20
Stock option, Minimum Range | 55.01
Stock option, Maximum Range | $ 70.00
Range Three [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted-Avg Remaining Contractual Life | 3 years 7 months 2 days
Stock Options Outstanding, Shares | shares | 2,372,411
Stock Options Outstanding, Weighted - Average Exercise Price | $ 75.94
Stock Options Exercisable, Shares | shares | 2,372,411
Stock Options Exercisable, Weighted - Average Exercise Price | $ 75.94
Stock option, Minimum Range | 70.01
Stock option, Maximum Range | $ 77.99

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- Definition Share-based compensation shares authorized under stock option plan exercise price range outstanding options weighted average exercise price. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling 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 Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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