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Stock-based Compensation Plans - Summary of Stock Option Activity (Detail) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |  |
Outstanding at beginning of year, Shares | 47,210 | 46,502 | 41,087
Granted, Shares | 2,121 | 5,024 | 7,672
Exercised, Shares | (936) | (1,156) | (3,357)
Forfeited, Shares | (4,866) | (3,160) | (1,988)
Outstanding at year-end, Shares | 43,529 | 47,210 | 46,502
Outstanding at beginning of year, Weighted-Average Exercise Price | $ 79.13 | $ 78.31 | $ 78.73
Granted, Weighted-Average Exercise Price | 76.95 | 86.55 | 76.14
Exercised, Weighted-Average Exercise Price | 54.20 | 57.87 | 60.70
Forfeited, Weighted-Average Exercise Price | 84.19 | 86.99 | 84.60
Outstanding at year-end, Weighted-Average Exercise Price | $ 79.36 | $ 79.13 | $ 78.31
Cameron |  |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |  |
Assumed in transaction, Shares |  |  | 3,088
Assumed in transaction, Weighted-Average Exercise Price |  |  | $ 63.24

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- Definition Share based compensation arrangements by share based payment award options assumed in acquisition transaction weighted average exercise price. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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