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Stock-based Compensation Plans - Summary of Stock Option Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
	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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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.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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