Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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Shareholders equity.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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-Name Accounting Standards Codification
-Section 50
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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
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-Section S99
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Total cost of shares repurchased divided by the total number of shares repurchased.

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-SubTopic 30
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Shareholders' equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Oct. 30, 2024	Aug. 02, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Feb. 28, 2025	Feb. 27, 2025	Jul. 30, 2024
Shareholders Equity [Line Items]
Common shares, authorized (in shares)			200,000,000
Common shares, par value (in dollars per share)			$ 1	$ 1
Preference shares, authorized (in shares)			500,000
Preference shares, outstanding (in shares)			0	0	0
Share repurchase program, authorized amount		$ 200						$ 500
Share repurchase program, authorized (in shares)	172,351	678,110
Percent purchased of authorized amount		80.00%
Cost per share (in USD per share)	$ 235.17	$ 235.95
Subsequent Event
Shareholders Equity [Line Items]
Share repurchase program, authorized amount						$ 300	$ 300
Stock Option
Shareholders Equity [Line Items]
Weighted average antidilutive which were not included in the calculation of earnings per share (in shares)			900,000	700,000	500,000