Stock-based Compensation Plans - Summary of Stock Option Activity (Detail) - $ / shares shares in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning of year, Shares	42	48	46
Granted, Shares			7
Exercised, Shares	(2)
Forfeited/Expired, Shares	(5)	(6)	(5)
Outstanding at year-end, Shares	35	42	48
Outstanding at beginning of year, Weighted-Average Exercise Price	$ 68.95	$ 70.37	$ 75.65
Granted, Weighted-Average Exercise Price			38.75
Exercised, Weighted-Average Exercise Price	40.04
Forfeited/Expired, Weighted Average Exercise Price	71.45	80.46	71.86
Outstanding at year-end, Weighted-Average Exercise Price	$ 70.31	$ 68.95	$ 70.37

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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