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Stock-Based Compensation and Other Stock Plans - Summary of Stock Option Activity (Detail) - Stock Option [Member] $ / shares in Units, shares in Thousands, $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($) $ / shares shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Shares, Outstanding at beginning of period | shares | 3,011
Shares, Granted | shares | 655
Shares, Exercised | shares | (278)
Shares, Forfeited or expired | shares | (71)
Shares, Outstanding at end of period | shares | 3,317
Shares, Exercisable at end of period | shares | 2,108
Exercise Price Per Share, Outstanding at beginning of period | $ / shares | $ 100.78
Exercise Price Per Share, Granted | $ / shares | 168.71
Exercise Price Per Share, Exercised | $ / shares | 87.00
Exercise Price Per Share, Forfeited or expired | $ / shares | 153.52
Exercise Price Per Share, Outstanding at end of period | $ / shares | 114.22
Exercise Price Per Share, Exercisable at end of period | $ / shares | $ 90.90
Remaining Contractual Term, Outstanding at end of period | 6 years 7 months 6 days
Remaining Contractual Term, Exercisable at end of period | 5 years 3 months 19 days
Aggregate Intrinsic Value, Outstanding at end of period | $ | $ 127.7
Aggregate Intrinsic Value, Exercisable at end of period | $ | $ 122.5

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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