Stock-based Compensation Plans - Summary of Stock Option Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning of year, Shares	48,272	46,269	43,529
Granted, Shares		7,468	5,604
Exercised, Shares			(1,045)
Forfeited/Expired, Shares	(5,925)	(5,465)	(1,819)
Outstanding at year-end, Shares	42,347	48,272	46,269
Outstanding at beginning of year, Weighted-Average Exercise Price	$ 70.37	$ 75.65	$ 79.36
Granted, Weighted-Average Exercise Price		38.75	41.50
Exercised, Weighted-Average Exercise Price			38.50
Forfeited/Expired, Weighted Average Exercise Price	80.46	71.86	74.69
Outstanding at year-end, Weighted-Average Exercise Price	$ 68.95	$ 70.37	$ 75.65

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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.

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Weighted average price of options that were either forfeited or expired.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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